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[2620:137:e000::1:20]) by mx.google.com with ESMTP id z15-20020aa7888f000000b0051c20f51870si17061859pfe.320.2022.06.27.14.47.28; Mon, 27 Jun 2022 14:47:40 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=D+phaCqn; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238787AbiF0Vlv (ORCPT + 99 others); Mon, 27 Jun 2022 17:41:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43388 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230347AbiF0Vlt (ORCPT ); Mon, 27 Jun 2022 17:41:49 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F12BCBA0; Mon, 27 Jun 2022 14:41:45 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 6FEE5617CA; Mon, 27 Jun 2022 21:41:45 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 98496C34115; Mon, 27 Jun 2022 21:41:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1656366104; bh=4AvUxR5n1PyDRkox9fBlHaNVM9AHo1bu5VB3ME41sxQ=; h=Date:From:To:Cc:Subject:Reply-To:References:In-Reply-To:From; b=D+phaCqn9i/UfFz1NMP19IHhhiDLwKW21/+XTUDp73psfif/pagJ3Q09DpXSftop8 9WGwSHBWzW3/DS3UV3EYDvRga9WG81s/XwBmABouSXuIkeASflrtw49Jdc8zSFHgYy Z438hh8D5dOzUSITHsAUzIDuwM6DbnwzGgErQtGjQbpfkKhx/OyfDcRsGH0oLuD0Wg lNBNFWyK/4n07yhxDUY5U0dJIDbNZVju0l3ImreK644IV2JbO57f6xeNokfujLm5aF KLzsxlNqNm3SL3+sHxWg1jVtbtEexRhAA6hOm6eS80KYnI1fkuyuSyFrlT24JzjrWH DAWK7qn8v4kng== Received: by paulmck-ThinkPad-P17-Gen-1.home (Postfix, from userid 1000) id 7FDD75C04B1; Mon, 27 Jun 2022 14:41:43 -0700 (PDT) Date: Mon, 27 Jun 2022 14:41:43 -0700 From: "Paul E. McKenney" To: "Zhang, Qiang1" Cc: Boqun Feng , "quic_neeraju@quicinc.com" , "frederic@kernel.org" , "rcu@vger.kernel.org" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH] rcu: Add exp QS check in rcu_exp_handler() for no-preemptible expedited RCU Message-ID: <20220627214143.GP1790663@paulmck-ThinkPad-P17-Gen-1> Reply-To: paulmck@kernel.org References: <20220622103549.2840087-1-qiang1.zhang@intel.com> <20220623003409.GD1790663@paulmck-ThinkPad-P17-Gen-1> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Spam-Status: No, score=-7.5 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_HI, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jun 23, 2022 at 03:23:19AM +0000, Zhang, Qiang1 wrote: > On Wed, Jun 22, 2022 at 05:34:09PM -0700, Paul E. McKenney wrote: > > On Wed, Jun 22, 2022 at 11:34:15PM +0000, Zhang, Qiang1 wrote: > > > > > > On Wed, Jun 22, 2022 at 06:35:49PM +0800, Zqiang wrote: > > > > In CONFIG_PREEMPT=n and CONFIG_PREEMPT_COUNT=y kernel, after a exp > > > > grace period begins, if detected current CPU enters idle in > > > > rcu_exp_handler() IPI handler, will immediately report the exp QS of the > > > > current cpu, at this time, maybe not being in an RCU read-side critical > > > > section, but need wait until rcu-softirq or sched-clock irq or sched-switch > > > > occurs on current CPU to check and report exp QS. > > > > > > > > > > >I think the idea is OK, however, this "optimization" is based on the > > > >implementation detail that rcu_read_lock() counts preempt_count when > > > >CONFIG_PREEMPT_COUNT=y, right? It's a little bit dangerous because the > > > >preempt_count when CONFIG_PREEMPT_COUNT=y and CONFIG_PREEMPT=n is mostly > > > >for debugging purposes IIUC, and in other words, _it could be gone_. > > > > > > > > > > Yes, for CONFIG_PREEMPT_COUNT=y and CONFIG_PREEMPT=n kernel > > > The rcu_read_lock/unlock are replaced by preempt_disbale/enable, and the > > > preempt-count is exists, so can report exp QS when not being an RCU > > > read-side critical(preempt_count & (PREEMPT_MASK | SOFTIRQ_MASK )return zero). > > > in IPI handler. > > > > > > For CONFIG_PREEMPT_COUNT=n and CONFIG_PREEMPT=n kernel, > > > The rcu_read_lock/unlock is just barrier(). > > > > > > > > > So I add IS_ENABLED(CONFIG_PREEMPT_COUNT) check in code. > > > > > > Of course, for CONFIG_PREEMPT_COUNT=n kernel, in RCU softirq, the > > > preempt-count is also checked > > > > > > /* Report any deferred quiescent states if preemption enabled. */ > > > if (IS_ENABLED(CONFIG_PREEMPT_COUNT) && (!(preempt_count() & PREEMPT_MASK))) { > > > rcu_preempt_deferred_qs(current); > > > > > > but the RCU softirq may not be triggered in time and reported exp QS, for > > > example a kernel loop exist on NO_HZ_FULL CPU > > > > > > this change, It is to capture the exp QS state earlier and report it. > > > > > > > > > >Also I'm not aware of any but there could be someone assuming that RCU > > > >read-side critical sections can be formed without > > > >rcu_read_{lock,unlock}() in CONFIG_PREEMPT=n kernel. For example, there > > > >might be "creative" code like the following: > > > > > > > > void do_something_only_in_nonpreempt(void) > > > > { > > > > int *p; > > > > > > > > // This function only gets called in PREEMPT=n kernel, > > > > // which means everywhere is a RCU read-side critical > > > > // section, let's save some lines of code. > > > > > > > rcu_read_lock(); > > > > p = rcu_dereference_check(gp, !IS_ENABLED(PREEMPT)); > > > > ... // of course no schedule() here. > > > > > > > rcu_read_unlock(); > > > > } > > > > > > > > > > Usually access to pointers of type rcu needs to be protected. > > Yes, _ususally_ they are, but what about the special cases? Because > in PREEMPT=n kernel, almost everywhere is a RCU read-side critical > section, some one might have been "creative" enough to omit these > rcu_read_lock() and rcu_read_unlock(). > > > > > Indeed, lockdep would normally complain about this sort of thing. > > But in kernels built with (say) CONFIG_PREEMPT_NONE=y but without > > CONFIG_PREEMPT_COUNT=N, can lockdep really tell the difference? > > > > >Actually with the rcu_dereference_check() above, lockdep cannot detect > >even CONFIG_PREEMPT_COUNT=y, that rcu_dereference_check() basically says > >"I know I'm in a read-side critical section if it's a non-preempt > >kernel, so don't bother to check". ;-) > > > > Any thoughts? > > > > It would be good to have some performance data on this change to expedited > > grace periods. It is adding code, so it needs some real motivation. > > I used rcuscale to test it, and count the average time of writer-duration > > no applied patch(org.txt) > writer avg time 29690.39 29670.78 29770.65 29423.25 > > applied patch(new.txt) > writer avg time 28989.99 29003.54 29281.39 28986.58 > > or Is there a better way to test? If I understand your measurments correctly, you are getting about a 2% improvement in expedited grace-period latency in !PREEMPT kernels. Do we have a situation for which that 2% improvement is important? We would be taking some risk due to the issues Boqun points out or we would be adding some complexity to avoid those issues. So this 2% has a definite cost associated with it. What am I missing here? Thanx, Paul > Thanks > Zqiang > > > >Agreed. > > > >Regards, > >Boqun > > > So, does this change make a system-level difference in (say) expedited > > RCU grace-period latency, and if so, under what conditions? > > > > Thanx, Paul > > > > > >Again, I'm not aware of any existing code that does this but we need to > > > >be sure. > > > > > > > >Regards, > > > >Boqun > > > > > > > > This commit add a exp QS check in rcu_exp_handler(), when not being > > > > in an RCU read-side critical section, report exp QS earlier. > > > > > > > > Signed-off-by: Zqiang > > > > --- > > > > kernel/rcu/tree_exp.h | 5 ++++- > > > > 1 file changed, 4 insertions(+), 1 deletion(-) > > > > > > > > diff --git a/kernel/rcu/tree_exp.h b/kernel/rcu/tree_exp.h > > > > index be667583a554..34f08267410f 100644 > > > > --- a/kernel/rcu/tree_exp.h > > > > +++ b/kernel/rcu/tree_exp.h > > > > @@ -828,11 +828,14 @@ static void rcu_exp_handler(void *unused) > > > > { > > > > struct rcu_data *rdp = this_cpu_ptr(&rcu_data); > > > > struct rcu_node *rnp = rdp->mynode; > > > > + bool preempt_bh_disabled = > > > > + !!(preempt_count() & (PREEMPT_MASK | SOFTIRQ_MASK)); > > > > > > > > if (!(READ_ONCE(rnp->expmask) & rdp->grpmask) || > > > > __this_cpu_read(rcu_data.cpu_no_qs.b.exp)) > > > > return; > > > > - if (rcu_is_cpu_rrupt_from_idle()) { > > > > + if (rcu_is_cpu_rrupt_from_idle() || > > > > + (IS_ENABLED(CONFIG_PREEMPT_COUNT) && !preempt_bh_disabled)) { > > > > rcu_report_exp_rdp(this_cpu_ptr(&rcu_data)); > > > > return; > > > > } > > > > -- > > > > 2.25.1 > > > > > [ 28.907109] rcu-scale: rcu_scale_writer 3 has 100 measurements > [ 28.907133] rcu-scale: rcu_scale_writer 0 has 100 measurements > [ 28.907135] rcu-scale: rcu_scale_writer 1 has 100 measurements > [ 28.907138] rcu-scale: rcu_scale_writer 2 has 100 measurements > [ 28.917241] Dumping ftrace buffer: > [ 28.917256] (ftrace buffer empty) > [ 28.917261] rcu-scale: Test complete > [ 49.336302] rcu-scale:!!! All grace periods expedited, no normal ones to measure! > [ 49.336329] rcu-torture: Stopping rcu_scale_reader task > [ 49.336340] rcu-torture: rcu_scale_reader is stopping > [ 49.336351] rcu-torture: Stopping rcu_scale_reader task > [ 49.336361] rcu-torture: rcu_scale_reader is stopping > [ 49.336370] rcu-torture: Stopping rcu_scale_reader task > [ 49.336405] rcu-torture: rcu_scale_reader is stopping > [ 49.336426] rcu-torture: Stopping rcu_scale_reader task > [ 49.336432] rcu-torture: rcu_scale_reader is stopping > [ 49.336443] rcu-torture: Stopping rcu_scale_writer task > [ 49.336450] rcu-torture: rcu_scale_writer is stopping > [ 49.336458] rcu-scale: writer 0 gps: 102 > [ 49.336460] rcu-torture: Stopping rcu_scale_writer task > [ 49.336465] rcu-torture: rcu_scale_writer is stopping > [ 49.336517] rcu-scale: writer 1 gps: 102 > [ 49.336519] rcu-torture: Stopping rcu_scale_writer task > [ 49.336524] rcu-torture: rcu_scale_writer is stopping > [ 49.336532] rcu-scale: writer 2 gps: 101 > [ 49.336533] rcu-torture: Stopping rcu_scale_writer task > [ 49.336539] rcu-torture: rcu_scale_writer is stopping > [ 49.336546] rcu-scale: writer 3 gps: 102 > [ 49.336548] rcu-scale: start: 28841772292 end: 28844718545 duration: 2946253 gps: 407 batches: 2 > [ 49.336550] rcu-scale: 0 writer-duration: 0 25552 > [ 49.339264] rcu-scale: 0 writer-duration: 1 42012 > [ 49.339274] rcu-scale: 0 writer-duration: 2 24377 > [ 49.339280] rcu-scale: 0 writer-duration: 3 34458 > [ 49.339299] rcu-scale: 0 writer-duration: 4 27007 > [ 49.339305] rcu-scale: 0 writer-duration: 5 36494 > [ 49.339310] rcu-scale: 0 writer-duration: 6 24278 > [ 49.339315] rcu-scale: 0 writer-duration: 7 29383 > [ 49.339321] rcu-scale: 0 writer-duration: 8 26494 > [ 49.339326] rcu-scale: 0 writer-duration: 9 35430 > [ 49.339331] rcu-scale: 0 writer-duration: 10 23986 > [ 49.339337] rcu-scale: 0 writer-duration: 11 28663 > [ 49.339342] rcu-scale: 0 writer-duration: 12 26329 > [ 49.339347] rcu-scale: 0 writer-duration: 13 35645 > [ 49.339353] rcu-scale: 0 writer-duration: 14 23761 > [ 49.339358] rcu-scale: 0 writer-duration: 15 28889 > [ 49.339364] rcu-scale: 0 writer-duration: 16 26519 > [ 49.339369] rcu-scale: 0 writer-duration: 17 35863 > [ 49.339374] rcu-scale: 0 writer-duration: 18 23984 > [ 49.339380] rcu-scale: 0 writer-duration: 19 28618 > [ 49.339385] rcu-scale: 0 writer-duration: 20 26547 > [ 49.339390] rcu-scale: 0 writer-duration: 21 35515 > [ 49.339395] rcu-scale: 0 writer-duration: 22 23913 > [ 49.339400] rcu-scale: 0 writer-duration: 23 28510 > [ 49.339405] rcu-scale: 0 writer-duration: 24 26746 > [ 49.339410] rcu-scale: 0 writer-duration: 25 35670 > [ 49.339416] rcu-scale: 0 writer-duration: 26 23963 > [ 49.339421] rcu-scale: 0 writer-duration: 27 28561 > [ 49.339427] rcu-scale: 0 writer-duration: 28 26380 > [ 49.339432] rcu-scale: 0 writer-duration: 29 36039 > [ 49.339438] rcu-scale: 0 writer-duration: 30 24215 > [ 49.339443] rcu-scale: 0 writer-duration: 31 28891 > [ 49.339449] rcu-scale: 0 writer-duration: 32 26578 > [ 49.339454] rcu-scale: 0 writer-duration: 33 40498 > [ 49.339459] rcu-scale: 0 writer-duration: 34 24245 > [ 49.339464] rcu-scale: 0 writer-duration: 35 29465 > [ 49.339469] rcu-scale: 0 writer-duration: 36 26946 > [ 49.339475] rcu-scale: 0 writer-duration: 37 35955 > [ 49.339480] rcu-scale: 0 writer-duration: 38 24059 > [ 49.339486] rcu-scale: 0 writer-duration: 39 28795 > [ 49.339491] rcu-scale: 0 writer-duration: 40 26536 > [ 49.339496] rcu-scale: 0 writer-duration: 41 35879 > [ 49.339501] rcu-scale: 0 writer-duration: 42 24181 > [ 49.339506] rcu-scale: 0 writer-duration: 43 28639 > [ 49.339512] rcu-scale: 0 writer-duration: 44 26546 > [ 49.339517] rcu-scale: 0 writer-duration: 45 35884 > [ 49.339522] rcu-scale: 0 writer-duration: 46 23986 > [ 49.339527] rcu-scale: 0 writer-duration: 47 28668 > [ 49.339532] rcu-scale: 0 writer-duration: 48 26454 > [ 49.339537] rcu-scale: 0 writer-duration: 49 35772 > [ 49.339542] rcu-scale: 0 writer-duration: 50 23942 > [ 49.339547] rcu-scale: 0 writer-duration: 51 28803 > [ 49.339553] rcu-scale: 0 writer-duration: 52 26545 > [ 49.339558] rcu-scale: 0 writer-duration: 53 35615 > [ 49.339563] rcu-scale: 0 writer-duration: 54 23569 > [ 49.339568] rcu-scale: 0 writer-duration: 55 28427 > [ 49.339573] rcu-scale: 0 writer-duration: 56 26489 > [ 49.339578] rcu-scale: 0 writer-duration: 57 35516 > [ 49.339584] rcu-scale: 0 writer-duration: 58 23722 > [ 49.339589] rcu-scale: 0 writer-duration: 59 28435 > [ 49.339594] rcu-scale: 0 writer-duration: 60 26401 > [ 49.339599] rcu-scale: 0 writer-duration: 61 35488 > [ 49.339604] rcu-scale: 0 writer-duration: 62 23855 > [ 49.339610] rcu-scale: 0 writer-duration: 63 28583 > [ 49.339615] rcu-scale: 0 writer-duration: 64 26629 > [ 49.339620] rcu-scale: 0 writer-duration: 65 36168 > [ 49.339625] rcu-scale: 0 writer-duration: 66 24191 > [ 49.339630] rcu-scale: 0 writer-duration: 67 28802 > [ 49.339635] rcu-scale: 0 writer-duration: 68 32436 > [ 49.339640] rcu-scale: 0 writer-duration: 69 38444 > [ 49.339646] rcu-scale: 0 writer-duration: 70 24417 > [ 49.339651] rcu-scale: 0 writer-duration: 71 29128 > [ 49.339656] rcu-scale: 0 writer-duration: 72 26480 > [ 49.339661] rcu-scale: 0 writer-duration: 73 35881 > [ 49.339666] rcu-scale: 0 writer-duration: 74 24123 > [ 49.339671] rcu-scale: 0 writer-duration: 75 28735 > [ 49.339676] rcu-scale: 0 writer-duration: 76 26359 > [ 49.339681] rcu-scale: 0 writer-duration: 77 35715 > [ 49.339687] rcu-scale: 0 writer-duration: 78 24092 > [ 49.339692] rcu-scale: 0 writer-duration: 79 28716 > [ 49.339698] rcu-scale: 0 writer-duration: 80 26448 > [ 49.339703] rcu-scale: 0 writer-duration: 81 35935 > [ 49.339708] rcu-scale: 0 writer-duration: 82 23966 > [ 49.339713] rcu-scale: 0 writer-duration: 83 28552 > [ 49.339718] rcu-scale: 0 writer-duration: 84 26487 > [ 49.339723] rcu-scale: 0 writer-duration: 85 35490 > [ 49.339729] rcu-scale: 0 writer-duration: 86 23976 > [ 49.339734] rcu-scale: 0 writer-duration: 87 28679 > [ 49.339740] rcu-scale: 0 writer-duration: 88 26525 > [ 49.339745] rcu-scale: 0 writer-duration: 89 35764 > [ 49.339750] rcu-scale: 0 writer-duration: 90 24050 > [ 49.339756] rcu-scale: 0 writer-duration: 91 28777 > [ 49.339761] rcu-scale: 0 writer-duration: 92 26412 > [ 49.339767] rcu-scale: 0 writer-duration: 93 35707 > [ 49.339772] rcu-scale: 0 writer-duration: 94 23913 > [ 49.339777] rcu-scale: 0 writer-duration: 95 28450 > [ 49.339782] rcu-scale: 0 writer-duration: 96 26665 > [ 49.339788] rcu-scale: 0 writer-duration: 97 35636 > [ 49.339793] rcu-scale: 0 writer-duration: 98 23953 > [ 49.339798] rcu-scale: 0 writer-duration: 99 28466 > [ 49.339804] rcu-scale: 0 writer-duration: 100 26654 > [ 49.341227] rcu-scale: 0 writer-duration: 101 225635 > > > > > [ 49.341246] rcu-scale: 1 writer-duration: 0 27277 > [ 49.343227] rcu-scale: 1 writer-duration: 1 34458 > [ 49.343236] rcu-scale: 1 writer-duration: 2 27340 > [ 49.343242] rcu-scale: 1 writer-duration: 3 41758 > [ 49.343248] rcu-scale: 1 writer-duration: 4 24161 > [ 49.343254] rcu-scale: 1 writer-duration: 5 29250 > [ 49.343260] rcu-scale: 1 writer-duration: 6 26996 > [ 49.343266] rcu-scale: 1 writer-duration: 7 36482 > [ 49.343272] rcu-scale: 1 writer-duration: 8 23782 > [ 49.343277] rcu-scale: 1 writer-duration: 9 28433 > [ 49.343283] rcu-scale: 1 writer-duration: 10 26577 > [ 49.343289] rcu-scale: 1 writer-duration: 11 35616 > [ 49.343295] rcu-scale: 1 writer-duration: 12 23821 > [ 49.343301] rcu-scale: 1 writer-duration: 13 28678 > [ 49.343307] rcu-scale: 1 writer-duration: 14 26517 > [ 49.343313] rcu-scale: 1 writer-duration: 15 35548 > [ 49.343319] rcu-scale: 1 writer-duration: 16 24196 > [ 49.343325] rcu-scale: 1 writer-duration: 17 28626 > [ 49.343332] rcu-scale: 1 writer-duration: 18 26772 > [ 49.343338] rcu-scale: 1 writer-duration: 19 35539 > [ 49.343344] rcu-scale: 1 writer-duration: 20 23897 > [ 49.343350] rcu-scale: 1 writer-duration: 21 28635 > [ 49.343356] rcu-scale: 1 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[ 49.343465] rcu-scale: 1 writer-duration: 41 28684 > [ 49.343470] rcu-scale: 1 writer-duration: 42 26901 > [ 49.343475] rcu-scale: 1 writer-duration: 43 35717 > [ 49.343480] rcu-scale: 1 writer-duration: 44 23957 > [ 49.343485] rcu-scale: 1 writer-duration: 45 28780 > [ 49.343490] rcu-scale: 1 writer-duration: 46 26747 > [ 49.343495] rcu-scale: 1 writer-duration: 47 35538 > [ 49.343501] rcu-scale: 1 writer-duration: 48 23963 > [ 49.343506] rcu-scale: 1 writer-duration: 49 28727 > [ 49.343511] rcu-scale: 1 writer-duration: 50 26519 > [ 49.343516] rcu-scale: 1 writer-duration: 51 35733 > [ 49.343521] rcu-scale: 1 writer-duration: 52 24098 > [ 49.343527] rcu-scale: 1 writer-duration: 53 28557 > [ 49.343532] rcu-scale: 1 writer-duration: 54 26208 > [ 49.343537] rcu-scale: 1 writer-duration: 55 35315 > [ 49.343543] rcu-scale: 1 writer-duration: 56 23932 > [ 49.343548] rcu-scale: 1 writer-duration: 57 28507 > [ 49.343553] rcu-scale: 1 writer-duration: 58 26443 > [ 49.343559] rcu-scale: 1 writer-duration: 59 35306 > [ 49.343564] rcu-scale: 1 writer-duration: 60 23868 > [ 49.343570] rcu-scale: 1 writer-duration: 61 28606 > [ 49.343575] rcu-scale: 1 writer-duration: 62 26308 > [ 49.343580] rcu-scale: 1 writer-duration: 63 35693 > [ 49.343586] rcu-scale: 1 writer-duration: 64 23934 > [ 49.343591] rcu-scale: 1 writer-duration: 65 29456 > [ 49.343596] rcu-scale: 1 writer-duration: 66 26600 > [ 49.343602] rcu-scale: 1 writer-duration: 67 35682 > [ 49.343607] rcu-scale: 1 writer-duration: 68 29849 > [ 49.343612] rcu-scale: 1 writer-duration: 69 31555 > [ 49.343618] rcu-scale: 1 writer-duration: 70 26942 > [ 49.343623] rcu-scale: 1 writer-duration: 71 36037 > [ 49.343629] rcu-scale: 1 writer-duration: 72 23965 > [ 49.343634] rcu-scale: 1 writer-duration: 73 28811 > [ 49.343640] rcu-scale: 1 writer-duration: 74 26734 > [ 49.343645] rcu-scale: 1 writer-duration: 75 35712 > [ 49.343650] rcu-scale: 1 writer-duration: 76 23845 > [ 49.343656] rcu-scale: 1 writer-duration: 77 28619 > [ 49.343661] rcu-scale: 1 writer-duration: 78 26637 > [ 49.343666] rcu-scale: 1 writer-duration: 79 35773 > [ 49.343672] rcu-scale: 1 writer-duration: 80 23910 > [ 49.343677] rcu-scale: 1 writer-duration: 81 28873 > [ 49.343682] rcu-scale: 1 writer-duration: 82 26581 > [ 49.343688] rcu-scale: 1 writer-duration: 83 35517 > [ 49.343694] rcu-scale: 1 writer-duration: 84 23928 > [ 49.343699] rcu-scale: 1 writer-duration: 85 28565 > [ 49.343704] rcu-scale: 1 writer-duration: 86 26464 > [ 49.343710] rcu-scale: 1 writer-duration: 87 35715 > [ 49.343715] rcu-scale: 1 writer-duration: 88 23968 > [ 49.343721] rcu-scale: 1 writer-duration: 89 28784 > [ 49.343726] rcu-scale: 1 writer-duration: 90 26576 > [ 49.343731] rcu-scale: 1 writer-duration: 91 35800 > [ 49.343737] rcu-scale: 1 writer-duration: 92 23918 > [ 49.343742] rcu-scale: 1 writer-duration: 93 28487 > [ 49.343747] rcu-scale: 1 writer-duration: 94 26491 > [ 49.343753] rcu-scale: 1 writer-duration: 95 35565 > [ 49.343758] rcu-scale: 1 writer-duration: 96 24092 > [ 49.343763] rcu-scale: 1 writer-duration: 97 28469 > [ 49.343768] rcu-scale: 1 writer-duration: 98 26865 > [ 49.343774] rcu-scale: 1 writer-duration: 99 35343 > [ 49.343779] rcu-scale: 1 writer-duration: 100 23995 > [ 49.345221] rcu-scale: 1 writer-duration: 101 60524 > > > > [ 49.345235] rcu-scale: 2 writer-duration: 0 56581 > [ 49.347314] rcu-scale: 2 writer-duration: 1 32281 > [ 49.347329] rcu-scale: 2 writer-duration: 2 29516 > [ 49.347336] rcu-scale: 2 writer-duration: 3 29979 > [ 49.347342] rcu-scale: 2 writer-duration: 4 36232 > [ 49.347348] rcu-scale: 2 writer-duration: 5 26878 > [ 49.347354] rcu-scale: 2 writer-duration: 6 29099 > [ 49.347359] rcu-scale: 2 writer-duration: 7 24890 > [ 49.347365] rcu-scale: 2 writer-duration: 8 35614 > [ 49.347371] rcu-scale: 2 writer-duration: 9 26166 > [ 49.347377] rcu-scale: 2 writer-duration: 10 28552 > [ 49.347384] rcu-scale: 2 writer-duration: 11 24335 > [ 49.347390] rcu-scale: 2 writer-duration: 12 35614 > [ 49.347396] rcu-scale: 2 writer-duration: 13 25978 > [ 49.347402] rcu-scale: 2 writer-duration: 14 28541 > [ 49.347408] rcu-scale: 2 writer-duration: 15 24634 > [ 49.347413] rcu-scale: 2 writer-duration: 16 35640 > [ 49.347419] rcu-scale: 2 writer-duration: 17 26235 > [ 49.347425] rcu-scale: 2 writer-duration: 18 28782 > [ 49.347431] rcu-scale: 2 writer-duration: 19 24288 > [ 49.347437] rcu-scale: 2 writer-duration: 20 35649 > [ 49.347442] rcu-scale: 2 writer-duration: 21 25989 > [ 49.347448] rcu-scale: 2 writer-duration: 22 28527 > [ 49.347454] rcu-scale: 2 writer-duration: 23 24150 > [ 49.347460] rcu-scale: 2 writer-duration: 24 35960 > [ 49.347465] rcu-scale: 2 writer-duration: 25 26133 > [ 49.347471] rcu-scale: 2 writer-duration: 26 28714 > [ 49.347477] rcu-scale: 2 writer-duration: 27 24192 > [ 49.347482] rcu-scale: 2 writer-duration: 28 35545 > [ 49.347488] rcu-scale: 2 writer-duration: 29 26893 > [ 49.347494] rcu-scale: 2 writer-duration: 30 28621 > [ 49.347499] rcu-scale: 2 writer-duration: 31 24453 > [ 49.347505] rcu-scale: 2 writer-duration: 32 35750 > [ 49.347510] rcu-scale: 2 writer-duration: 33 31021 > [ 49.347516] rcu-scale: 2 writer-duration: 34 29061 > [ 49.347522] rcu-scale: 2 writer-duration: 35 25015 > [ 49.347528] rcu-scale: 2 writer-duration: 36 36107 > [ 49.347534] rcu-scale: 2 writer-duration: 37 26370 > [ 49.347540] rcu-scale: 2 writer-duration: 38 28888 > [ 49.347546] rcu-scale: 2 writer-duration: 39 24418 > [ 49.347552] rcu-scale: 2 writer-duration: 40 35675 > [ 49.347558] rcu-scale: 2 writer-duration: 41 26284 > [ 49.347564] rcu-scale: 2 writer-duration: 42 28924 > [ 49.347570] rcu-scale: 2 writer-duration: 43 24244 > [ 49.347576] rcu-scale: 2 writer-duration: 44 35835 > [ 49.347582] rcu-scale: 2 writer-duration: 45 26194 > [ 49.347587] rcu-scale: 2 writer-duration: 46 29080 > [ 49.347593] rcu-scale: 2 writer-duration: 47 24185 > [ 49.347599] rcu-scale: 2 writer-duration: 48 35543 > [ 49.347605] rcu-scale: 2 writer-duration: 49 26122 > [ 49.347610] rcu-scale: 2 writer-duration: 50 28822 > [ 49.347616] rcu-scale: 2 writer-duration: 51 24285 > [ 49.347622] rcu-scale: 2 writer-duration: 52 35720 > [ 49.347627] rcu-scale: 2 writer-duration: 53 26063 > [ 49.347633] rcu-scale: 2 writer-duration: 54 28508 > [ 49.347639] rcu-scale: 2 writer-duration: 55 24019 > [ 49.347645] rcu-scale: 2 writer-duration: 56 35499 > [ 49.347651] rcu-scale: 2 writer-duration: 57 26079 > [ 49.347657] rcu-scale: 2 writer-duration: 58 28502 > [ 49.347663] rcu-scale: 2 writer-duration: 59 24016 > [ 49.347668] rcu-scale: 2 writer-duration: 60 35515 > [ 49.347673] rcu-scale: 2 writer-duration: 61 26095 > [ 49.347677] rcu-scale: 2 writer-duration: 62 28602 > [ 49.347681] rcu-scale: 2 writer-duration: 63 24246 > [ 49.347686] rcu-scale: 2 writer-duration: 64 35675 > [ 49.347690] rcu-scale: 2 writer-duration: 65 26761 > [ 49.347694] rcu-scale: 2 writer-duration: 66 28833 > [ 49.347699] rcu-scale: 2 writer-duration: 67 24524 > [ 49.347703] rcu-scale: 2 writer-duration: 68 43780 > [ 49.347707] rcu-scale: 2 writer-duration: 69 26612 > [ 49.347712] rcu-scale: 2 writer-duration: 70 29290 > [ 49.347716] rcu-scale: 2 writer-duration: 71 24670 > [ 49.347720] rcu-scale: 2 writer-duration: 72 35526 > [ 49.347725] rcu-scale: 2 writer-duration: 73 26393 > [ 49.347729] rcu-scale: 2 writer-duration: 74 28967 > [ 49.347733] rcu-scale: 2 writer-duration: 75 24125 > [ 49.347738] rcu-scale: 2 writer-duration: 76 35713 > [ 49.347742] rcu-scale: 2 writer-duration: 77 26062 > [ 49.347746] rcu-scale: 2 writer-duration: 78 28888 > [ 49.347751] rcu-scale: 2 writer-duration: 79 24344 > [ 49.347755] rcu-scale: 2 writer-duration: 80 35858 > [ 49.347760] rcu-scale: 2 writer-duration: 81 26330 > [ 49.347764] rcu-scale: 2 writer-duration: 82 28661 > [ 49.347769] rcu-scale: 2 writer-duration: 83 24180 > [ 49.347773] rcu-scale: 2 writer-duration: 84 35464 > [ 49.347778] rcu-scale: 2 writer-duration: 85 25886 > [ 49.347782] rcu-scale: 2 writer-duration: 86 28916 > [ 49.347786] rcu-scale: 2 writer-duration: 87 24149 > [ 49.347791] rcu-scale: 2 writer-duration: 88 35860 > [ 49.347795] rcu-scale: 2 writer-duration: 89 26100 > [ 49.347800] rcu-scale: 2 writer-duration: 90 28999 > [ 49.347804] rcu-scale: 2 writer-duration: 91 24105 > [ 49.347809] rcu-scale: 2 writer-duration: 92 35720 > [ 49.347813] rcu-scale: 2 writer-duration: 93 26093 > [ 49.347817] rcu-scale: 2 writer-duration: 94 28729 > [ 49.347822] rcu-scale: 2 writer-duration: 95 24063 > [ 49.347826] rcu-scale: 2 writer-duration: 96 35819 > [ 49.347831] rcu-scale: 2 writer-duration: 97 26119 > [ 49.347835] rcu-scale: 2 writer-duration: 98 28648 > [ 49.347840] rcu-scale: 2 writer-duration: 99 24175 > [ 49.347844] rcu-scale: 2 writer-duration: 100 34035 > > > > > [ 49.349299] rcu-scale: 3 writer-duration: 0 26939 > [ 49.351268] rcu-scale: 3 writer-duration: 1 27152 > [ 49.351277] rcu-scale: 3 writer-duration: 2 30299 > [ 49.351281] rcu-scale: 3 writer-duration: 3 36662 > [ 49.351284] rcu-scale: 3 writer-duration: 4 31847 > [ 49.351287] rcu-scale: 3 writer-duration: 5 29203 > [ 49.351290] rcu-scale: 3 writer-duration: 6 24861 > [ 49.351294] rcu-scale: 3 writer-duration: 7 36222 > [ 49.351297] rcu-scale: 3 writer-duration: 8 26790 > [ 49.351300] rcu-scale: 3 writer-duration: 9 28626 > [ 49.351303] rcu-scale: 3 writer-duration: 10 24007 > [ 49.351307] rcu-scale: 3 writer-duration: 11 35765 > [ 49.351310] rcu-scale: 3 writer-duration: 12 26226 > [ 49.351314] rcu-scale: 3 writer-duration: 13 28495 > [ 49.351317] rcu-scale: 3 writer-duration: 14 24188 > [ 49.351321] rcu-scale: 3 writer-duration: 15 35686 > [ 49.351324] rcu-scale: 3 writer-duration: 16 26290 > [ 49.351327] rcu-scale: 3 writer-duration: 17 28740 > [ 49.351331] rcu-scale: 3 writer-duration: 18 24201 > [ 49.351334] rcu-scale: 3 writer-duration: 19 36000 > [ 49.351337] rcu-scale: 3 writer-duration: 20 25995 > [ 49.351341] rcu-scale: 3 writer-duration: 21 28649 > [ 49.351344] rcu-scale: 3 writer-duration: 22 24081 > [ 49.351348] rcu-scale: 3 writer-duration: 23 35718 > [ 49.351351] rcu-scale: 3 writer-duration: 24 26077 > [ 49.351354] rcu-scale: 3 writer-duration: 25 28773 > [ 49.351357] rcu-scale: 3 writer-duration: 26 24280 > [ 49.351360] rcu-scale: 3 writer-duration: 27 35767 > [ 49.351364] rcu-scale: 3 writer-duration: 28 25956 > [ 49.351367] rcu-scale: 3 writer-duration: 29 28632 > [ 49.351370] rcu-scale: 3 writer-duration: 30 24996 > [ 49.351374] rcu-scale: 3 writer-duration: 31 35673 > [ 49.351377] rcu-scale: 3 writer-duration: 32 26217 > [ 49.351380] rcu-scale: 3 writer-duration: 33 28855 > [ 49.351383] rcu-scale: 3 writer-duration: 34 28655 > [ 49.351387] rcu-scale: 3 writer-duration: 35 36525 > [ 49.351390] rcu-scale: 3 writer-duration: 36 27052 > [ 49.351394] rcu-scale: 3 writer-duration: 37 28841 > [ 49.351397] rcu-scale: 3 writer-duration: 38 24600 > [ 49.351400] rcu-scale: 3 writer-duration: 39 35743 > [ 49.351404] rcu-scale: 3 writer-duration: 40 26391 > [ 49.351407] rcu-scale: 3 writer-duration: 41 28642 > [ 49.351410] rcu-scale: 3 writer-duration: 42 24334 > [ 49.351413] rcu-scale: 3 writer-duration: 43 36152 > [ 49.351417] rcu-scale: 3 writer-duration: 44 26133 > [ 49.351420] rcu-scale: 3 writer-duration: 45 28732 > [ 49.351423] rcu-scale: 3 writer-duration: 46 24235 > [ 49.351426] rcu-scale: 3 writer-duration: 47 36069 > [ 49.351429] rcu-scale: 3 writer-duration: 48 25993 > [ 49.351433] rcu-scale: 3 writer-duration: 49 28658 > [ 49.351436] rcu-scale: 3 writer-duration: 50 24225 > [ 49.351439] rcu-scale: 3 writer-duration: 51 35909 > [ 49.351442] rcu-scale: 3 writer-duration: 52 26176 > [ 49.351446] rcu-scale: 3 writer-duration: 53 28702 > [ 49.351449] rcu-scale: 3 writer-duration: 54 24169 > [ 49.351453] rcu-scale: 3 writer-duration: 55 35462 > [ 49.351456] rcu-scale: 3 writer-duration: 56 25771 > [ 49.351459] rcu-scale: 3 writer-duration: 57 28677 > [ 49.351462] rcu-scale: 3 writer-duration: 58 24089 > [ 49.351466] rcu-scale: 3 writer-duration: 59 35538 > [ 49.351469] rcu-scale: 3 writer-duration: 60 25785 > [ 49.351472] rcu-scale: 3 writer-duration: 61 28669 > [ 49.351475] rcu-scale: 3 writer-duration: 62 24075 > [ 49.351478] rcu-scale: 3 writer-duration: 63 35720 > [ 49.351482] rcu-scale: 3 writer-duration: 64 26017 > [ 49.351485] rcu-scale: 3 writer-duration: 65 28726 > [ 49.351488] rcu-scale: 3 writer-duration: 66 24990 > [ 49.351491] rcu-scale: 3 writer-duration: 67 35814 > [ 49.351494] rcu-scale: 3 writer-duration: 68 26215 > [ 49.351498] rcu-scale: 3 writer-duration: 69 34468 > [ 49.351501] rcu-scale: 3 writer-duration: 70 27200 > [ 49.351504] rcu-scale: 3 writer-duration: 71 36288 > [ 49.351507] rcu-scale: 3 writer-duration: 72 26445 > [ 49.351511] rcu-scale: 3 writer-duration: 73 28593 > [ 49.351514] rcu-scale: 3 writer-duration: 74 24317 > [ 49.351517] rcu-scale: 3 writer-duration: 75 36153 > [ 49.351521] rcu-scale: 3 writer-duration: 76 26164 > [ 49.351524] rcu-scale: 3 writer-duration: 77 28523 > [ 49.351527] rcu-scale: 3 writer-duration: 78 24252 > [ 49.351530] rcu-scale: 3 writer-duration: 79 35939 > [ 49.351533] rcu-scale: 3 writer-duration: 80 26058 > [ 49.351536] rcu-scale: 3 writer-duration: 81 28892 > [ 49.351540] rcu-scale: 3 writer-duration: 82 24342 > [ 49.351543] rcu-scale: 3 writer-duration: 83 35751 > [ 49.351546] rcu-scale: 3 writer-duration: 84 25932 > [ 49.351549] rcu-scale: 3 writer-duration: 85 28682 > [ 49.351552] rcu-scale: 3 writer-duration: 86 24086 > [ 49.351555] rcu-scale: 3 writer-duration: 87 35791 > [ 49.351559] rcu-scale: 3 writer-duration: 88 26189 > [ 49.351562] rcu-scale: 3 writer-duration: 89 28754 > [ 49.351565] rcu-scale: 3 writer-duration: 90 24250 > [ 49.351568] rcu-scale: 3 writer-duration: 91 35768 > [ 49.351572] rcu-scale: 3 writer-duration: 92 26160 > [ 49.351575] rcu-scale: 3 writer-duration: 93 28896 > [ 49.351578] rcu-scale: 3 writer-duration: 94 24020 > [ 49.351581] rcu-scale: 3 writer-duration: 95 35727 > [ 49.351584] rcu-scale: 3 writer-duration: 96 26099 > [ 49.351587] rcu-scale: 3 writer-duration: 97 28768 > [ 49.351590] rcu-scale: 3 writer-duration: 98 24011 > [ 49.351593] rcu-scale: 3 writer-duration: 99 35786 > [ 49.351597] rcu-scale: 3 writer-duration: 100 25989 > [ 49.353257] rcu-scale: 3 writer-duration: 101 46411 > > > [ 47.850402] rcu-scale: rcu_scale_writer 3 has 100 measurements > [ 47.850427] rcu-scale: rcu_scale_writer 0 has 100 measurements > [ 47.850429] rcu-scale: rcu_scale_writer 1 has 100 measurements > [ 47.850432] rcu-scale: rcu_scale_writer 2 has 100 measurements > [ 47.861470] Dumping ftrace buffer: > [ 47.861486] (ftrace buffer empty) > [ 47.861491] rcu-scale: Test complete > [ 63.668029] rcu-scale:!!! All grace periods expedited, no normal ones to measure! > [ 63.668051] rcu-torture: Stopping rcu_scale_reader task > [ 63.668074] rcu-torture: rcu_scale_reader is stopping > [ 63.668089] rcu-torture: Stopping rcu_scale_reader task > [ 63.668138] rcu-torture: rcu_scale_reader is stopping > [ 63.668151] rcu-torture: Stopping rcu_scale_reader task > [ 63.668191] rcu-torture: rcu_scale_reader is stopping > [ 63.668204] rcu-torture: Stopping rcu_scale_reader task > [ 63.668209] rcu-torture: rcu_scale_reader is stopping > [ 63.668231] rcu-torture: Stopping rcu_scale_writer task > [ 63.668241] rcu-torture: rcu_scale_writer is stopping > [ 63.668249] rcu-scale: writer 0 gps: 102 > [ 63.668251] rcu-torture: Stopping rcu_scale_writer task > [ 63.668260] rcu-torture: rcu_scale_writer is stopping > [ 63.668268] rcu-scale: writer 1 gps: 102 > [ 63.668270] rcu-torture: Stopping rcu_scale_writer task > [ 63.668279] rcu-torture: rcu_scale_writer is stopping > [ 63.668287] rcu-scale: writer 2 gps: 101 > [ 63.668288] rcu-torture: Stopping rcu_scale_writer task > [ 63.668293] rcu-torture: rcu_scale_writer is stopping > [ 63.668310] rcu-scale: writer 3 gps: 102 > [ 63.668311] rcu-scale: start: 47784890510 end: 47787901801 duration: 3011291 gps: 407 batches: 2 > [ 63.668314] rcu-scale: 0 writer-duration: 0 55830 > [ 63.669543] rcu-scale: 0 writer-duration: 1 40421 > [ 63.669546] rcu-scale: 0 writer-duration: 2 25268 > [ 63.669548] rcu-scale: 0 writer-duration: 3 32703 > [ 63.669549] rcu-scale: 0 writer-duration: 4 28624 > [ 63.669550] rcu-scale: 0 writer-duration: 5 36967 > [ 63.669551] rcu-scale: 0 writer-duration: 6 24686 > [ 63.669552] rcu-scale: 0 writer-duration: 7 29598 > [ 63.669554] rcu-scale: 0 writer-duration: 8 27026 > [ 63.669555] rcu-scale: 0 writer-duration: 9 38789 > [ 63.669556] rcu-scale: 0 writer-duration: 10 24398 > [ 63.669557] rcu-scale: 0 writer-duration: 11 29562 > [ 63.669559] rcu-scale: 0 writer-duration: 12 27348 > [ 63.669560] rcu-scale: 0 writer-duration: 13 36315 > [ 63.669561] rcu-scale: 0 writer-duration: 14 24233 > [ 63.669562] rcu-scale: 0 writer-duration: 15 29035 > [ 63.669564] rcu-scale: 0 writer-duration: 16 26754 > [ 63.669606] rcu-scale: 0 writer-duration: 17 36272 > [ 63.669608] rcu-scale: 0 writer-duration: 18 24237 > [ 63.669609] rcu-scale: 0 writer-duration: 19 28834 > [ 63.669610] rcu-scale: 0 writer-duration: 20 26993 > [ 63.669611] rcu-scale: 0 writer-duration: 21 36432 > [ 63.669612] rcu-scale: 0 writer-duration: 22 24178 > [ 63.669614] rcu-scale: 0 writer-duration: 23 28838 > [ 63.669615] rcu-scale: 0 writer-duration: 24 26733 > [ 63.669616] rcu-scale: 0 writer-duration: 25 36087 > [ 63.669617] rcu-scale: 0 writer-duration: 26 24237 > [ 63.669618] rcu-scale: 0 writer-duration: 27 28656 > [ 63.669620] rcu-scale: 0 writer-duration: 28 26921 > [ 63.669621] rcu-scale: 0 writer-duration: 29 36423 > [ 63.669622] rcu-scale: 0 writer-duration: 30 24201 > [ 63.669623] rcu-scale: 0 writer-duration: 31 28748 > [ 63.669625] 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> [ 63.673464] rcu-scale: 1 writer-duration: 4 25479 > [ 63.673470] rcu-scale: 1 writer-duration: 5 29908 > [ 63.673475] rcu-scale: 1 writer-duration: 6 27336 > [ 63.673481] rcu-scale: 1 writer-duration: 7 36948 > [ 63.673487] rcu-scale: 1 writer-duration: 8 24216 > [ 63.673494] rcu-scale: 1 writer-duration: 9 31639 > [ 63.673499] rcu-scale: 1 writer-duration: 10 27175 > [ 63.673506] rcu-scale: 1 writer-duration: 11 36695 > [ 63.673512] rcu-scale: 1 writer-duration: 12 24609 > [ 63.673518] rcu-scale: 1 writer-duration: 13 29140 > [ 63.673524] rcu-scale: 1 writer-duration: 14 26955 > [ 63.673530] rcu-scale: 1 writer-duration: 15 36122 > [ 63.673535] rcu-scale: 1 writer-duration: 16 24236 > [ 63.673541] rcu-scale: 1 writer-duration: 17 29137 > [ 63.673546] rcu-scale: 1 writer-duration: 18 26766 > [ 63.673552] rcu-scale: 1 writer-duration: 19 36207 > [ 63.673558] rcu-scale: 1 writer-duration: 20 24215 > [ 63.673563] rcu-scale: 1 writer-duration: 21 29239 > [ 63.673569] rcu-scale: 1 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