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[23.128.96.18]) by mx.google.com with ESMTP id hd33si11092504ejc.706.2021.07.05.09.02.34; Mon, 05 Jul 2021 09:03:04 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@gmx.net header.s=badeba3b8450 header.b=iO4pnOUe; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=gmx.de Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230364AbhGEQEK (ORCPT + 99 others); Mon, 5 Jul 2021 12:04:10 -0400 Received: from mout.gmx.net ([212.227.15.19]:32843 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230305AbhGEQEK (ORCPT ); Mon, 5 Jul 2021 12:04:10 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1625500860; bh=uVp3GwSwAmdwySaZ7yQaqPvJ0DdZ2cEJTxZIeGe5vtA=; h=X-UI-Sender-Class:Subject:From:To:Cc:Date:In-Reply-To:References; b=iO4pnOUe9HjXXviWrVgfoCmYi2z+Q38+m+VdILSjCeTI1u1HHxsbFspzyJD9jzTn2 pqdZ4ZfjaW/C+U8xHHG2vJY52PobI9Si/4gqTNfSlBVzK1VdDqyCQ4g3HJZlt1kDUh Qj9dEojhDReGfbDLoJ3HC1oB57Do/gAGx6dQQEow= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from homer.fritz.box ([185.191.218.12]) by mail.gmx.net (mrgmx004 [212.227.17.190]) with ESMTPSA (Nemesis) id 1MPokD-1lmV4h2emZ-00Mqf9; Mon, 05 Jul 2021 18:01:00 +0200 Message-ID: <206d6a81e08cb23a2c97e67335be6017e938bac5.camel@gmx.de> Subject: Re: [RFC v2 00/34] SLUB: reduce irq disabled scope and make it RT compatible From: Mike Galbraith To: Sebastian Andrzej Siewior , Vlastimil Babka Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Christoph Lameter , David Rientjes , Pekka Enberg , Joonsoo Kim , Thomas Gleixner , Mel Gorman , Jesper Dangaard Brouer , Peter Zijlstra , Jann Horn Date: Mon, 05 Jul 2021 18:00:58 +0200 In-Reply-To: <20210702182944.lqa7o2a25to6czju@linutronix.de> References: <20210609113903.1421-1-vbabka@suse.cz> <20210702182944.lqa7o2a25to6czju@linutronix.de> Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.34.4 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:g7W42PyyjLey67JhaWKQoU6QGXH2//AO9VgZ6m7h9RSj1gtSJ4e d/D11By1RHblBVBixQVuA8BXw/JTyZatGgzWGsj4mZAPH+ft/v6sLllQW6+oVtETx2NMAgU /tXqtQo4gL8nfKLNyvgf7T2ydxZ1BGIKaHYeB2Cw1guAvp8RHzoHnXJpsJdSoOdO9FfCnwU oyLPj8u1j5l7Hqjybm66w== X-Spam-Flag: NO X-UI-Out-Filterresults: notjunk:1;V03:K0:QDPxW+tJqGI=:u88Ux3Z0nTcGY0KDncvH3g bwaPEOxaD4zMfwYzguVWmvs0ucj7mBAz1RtM7DOFwvRtnpywG+IUOm4TzUstly94tNAWbSth3 Ufmm0K6SkC8bRFaam+DyI+Rwo3A8RLhY1J6+OEQJ6ojnwfHYcy35LPYCV5pQgJcBH4LXV3DPT w8s+jAey0a4usCuR54ReTj+RblLLa+U1u0DprPh8wKq2u3MHTvi/RvkENsW3S/noHEs4icw/r 6AoyiK9TUTkVnPWWIkzPOCzBO1/RUrlhIEKINw22x0uthuQ4bx+Ebibg/ajhL5crbZIC96o+G 8QcJeIiLu/Y+8zliq4i9NAeDJFf+Q0l52UeSvw2dC/+OClcNhHwvvB4y6EBRg632K3NxIWlvL 5skDjQCyelDNZhM0EeQPlA5xt/TsTf/eP3prWB4eAUt1plJriu8g1yijzaVeCxQYKwfIzYyah gZHmr800NPNRcJNoIlpNGGiAc4RChjVUlERx9whF5Mqp03ECfvLrHpQxnrRvPy+SiRDGNx7W6 kgXHZIBauy/pWFDUUYxwPCl0ZMVO3djliMEIa1tVM+hle9JowhMnxfQGmKymtgU1ibNBA1Ze+ Mp+vXuKG9ehw+rlRWCwjWFU9hpWtqxvQUEm6gQSFMSTZyGZAwNgjk5k2SEyx9BViY9xVpDLht FVa0UXDxOqhvNctgGb0lxdUqBzk7FKNUpungo6u3+s3B3a+YNW1C37a/rHHmvknHU2br356E0 jJDxB2iY4+g01CcoEqDiwBMdhbvYL+FxDVmOSA1DQ6CCDHuPFzlbhY5hgleRXWXhCXDC/wjPP WIDtkdSgwxILNo8gulYGX6DPaQApAI4TY1u9hlcVBqASz8sjj8UUVXEFGhyDCoUeejyTtyyNA fNKms6y4jMU/P9fxFziYIi1FFrMclOvgmax2qMCOq27s1w/jCIk4wkZfZ286j57JNY7dk3iux 2GbqI49HAGQEFVhy5pP1Jyu73mdJx/COxP4dAYPYXMPriQVSG3AAE5kRtnPCAAziBU7Q3xpIZ TBw6DsQklC3jrX2GYRkMPlcdtZMok+4XrAmFMaugaD6ynLEtw8lPFyh2HzV3o2B1MZrIvBv9y 7kuZ5jyPSQykn1dFYFdDKpOkaHgpQq19STn Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2021-07-02 at 20:29 +0200, Sebastian Andrzej Siewior wrote: > =20 > > The remaining patches to upstream from the RT tree are small ones > > related to KConfig. The patch that restricts PREEMPT_RT to SLUB > > (not SLAB or SLOB) makes sense. The patch that disables > > CONFIG_SLUB_CPU_PARTIAL with PREEMPT_RT could perhaps be re- > > evaluated as the series also addresses some latency issues with > > percpu partial slabs. >=20 > With that series the PARTIAL slab can be indeed enabled. I have (had) > a half done series where I had PARTIAL enabled and noticed a slight > increase in latency so made it "default y on !RT". It wasn't dramatic > but appeared to be outside of noise. I'm seeing warnings/explosions while exercising box IFF PARTIAL slab thingy is enabled. I aborted -PARTIAL after a little over 4 hours, whereas the longest survival of 4 +PARTIAL runs was 50 minutes, so I'm fairly confident that PARTIAL really really is the trigger. My reproducer is a keep box busy loop of parallel kbuild along with alternating ltp::controllers (sans swap-from-hell bits), ltp::zram and hackbench. The warning may or may not trigger before box explodes. =20 [ 224.232200] ------------[ cut here ]------------ [ 224.232202] WARNING: CPU: 3 PID: 9112 at mm/slub.c:2018 ___slab_alloc.co= nstprop.100+0xb09/0x13a0 [ 224.232210] Modules linked in: sr_mod(E) cdrom(E) zram(E) btrfs(E) blake= 2b_generic(E) xor(E) raid6_pq(E) xfs(E) libcrc32c(E) af_packet(E) ip6table_= mangle(E) ip6table_raw(E) iptable_raw(E) bridge(E) stp(E) llc(E) iscsi_ibft= (E) iscsi_boot_sysfs(E) nfnetlink(E) ebtable_filter(E) rfkill(E) ebtables(E= ) ip6table_filter(E) ip6_tables(E) iptable_filter(E) ip_tables(E) x_tables(= E) bpfilter(E) joydev(E) usblp(E) intel_rapl_msr(E) intel_rapl_common(E) nl= s_iso8859_1(E) nls_cp437(E) x86_pkg_temp_thermal(E) intel_powerclamp(E) cor= etemp(E) kvm_intel(E) kvm(E) snd_hda_codec_realtek(E) snd_hda_codec_generic= (E) ledtrig_audio(E) snd_hda_codec_hdmi(E) irqbypass(E) crct10dif_pclmul(E)= crc32_pclmul(E) ghash_clmulni_intel(E) snd_hda_intel(E) aesni_intel(E) snd= _intel_dspcfg(E) crypto_simd(E) iTCO_wdt(E) at24(E) intel_pmc_bxt(E) regmap= _i2c(E) mei_hdcp(E) iTCO_vendor_support(E) cryptd(E) snd_hda_codec(E) snd_h= wdep(E) pcspkr(E) i2c_i801(E) snd_hda_core(E) i2c_smbus(E) r8169(E) snd_pcm= (E) realtek(E) snd_timer(E) [ 224.232253] mei_me(E) mdio_devres(E) lpc_ich(E) snd(E) libphy(E) mei(E)= soundcore(E) mfd_core(E) fan(E) thermal(E) nfsd(E) intel_smartconnect(E) a= uth_rpcgss(E) nfs_acl(E) lockd(E) grace(E) sch_fq_codel(E) sunrpc(E) fuse(E= ) configfs(E) hid_logitech_hidpp(E) hid_logitech_dj(E) uas(E) usb_storage(E= ) hid_generic(E) usbhid(E) nouveau(E) wmi(E) drm_ttm_helper(E) ttm(E) i2c_a= lgo_bit(E) drm_kms_helper(E) syscopyarea(E) sysfillrect(E) sysimgblt(E) fb_= sys_fops(E) cec(E) ahci(E) rc_core(E) xhci_pci(E) ehci_pci(E) libahci(E) xh= ci_hcd(E) ehci_hcd(E) drm(E) libata(E) usbcore(E) video(E) button(E) sd_mod= (E) t10_pi(E) vfat(E) fat(E) virtio_blk(E) virtio_mmio(E) virtio_ring(E) vi= rtio(E) ext4(E) crc32c_intel(E) crc16(E) mbcache(E) jbd2(E) sg(E) dm_multip= ath(E) dm_mod(E) scsi_dh_rdac(E) scsi_dh_emc(E) scsi_dh_alua(E) scsi_mod(E)= msr(E) autofs4(E) [ 224.232295] CPU: 3 PID: 9112 Comm: dd Kdump: loaded Tainted: G = E 5.13.0.g60ab3ed-tip-rt-slub #25 [ 224.232297] Hardware name: MEDION MS-7848/MS-7848, BIOS M7848W08.20C 09/= 23/2013 [ 224.232299] RIP: 0010:___slab_alloc.constprop.100+0xb09/0x13a0 [ 224.232302] Code: 48 8b 7d 88 4c 89 ee 8b 47 28 4c 01 f8 48 89 c2 48 0f = ca 48 33 97 b8 00 00 00 48 33 10 e8 cf e5 ff ff e9 b5 00 00 00 4d 89 ce <0f= > 0b e9 2d fa ff ff 8b 53 38 8b 05 8f 47 4a 01 48 8b 75 80 83 c2 [ 224.232303] RSP: 0018:ffff8882047e3ba0 EFLAGS: 00010046 [ 224.232305] RAX: ffff888100040f80 RBX: 0000000000000000 RCX: 00000000801= 90019 [ 224.232307] RDX: ffffea0005d59a08 RSI: 0000000000000000 RDI: ffffffff817= 7ab54 [ 224.232308] RBP: ffff8882047e3c70 R08: ffffffffffffffff R09: 00000000000= 00000 [ 224.232309] R10: ffff8882047e3c90 R11: 0000000000000000 R12: ffffea0004d= 60780 [ 224.232310] R13: 0000000000000019 R14: 0000000000000000 R15: 00000000801= 90019 [ 224.232311] FS: 00007f88ffa09580(0000) GS:ffff88840ecc0000(0000) knlGS:= 0000000000000000 [ 224.232312] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 224.232313] CR2: 00007f88ffa4a000 CR3: 000000015606a005 CR4: 00000000001= 706e0 [ 224.232315] Call Trace: [ 224.232318] ? __alloc_file+0x26/0xf0 [ 224.232322] ? prep_new_page+0xab/0x100 [ 224.232326] ? __alloc_file+0x26/0xf0 [ 224.232329] ? __slab_alloc.isra.87.constprop.99+0x2e/0x40 [ 224.232331] __slab_alloc.isra.87.constprop.99+0x2e/0x40 [ 224.232333] ? __alloc_file+0x26/0xf0 [ 224.232335] kmem_cache_alloc+0x4d/0x160 [ 224.232338] __alloc_file+0x26/0xf0 [ 224.232340] alloc_empty_file+0x43/0xe0 [ 224.232343] path_openat+0x35/0xe30 [ 224.232345] ? getname_flags+0x32/0x170 [ 224.232347] ? ___slab_alloc.constprop.100+0xbbb/0x13a0 [ 224.232349] ? filemap_map_pages+0xf0/0x3e0 [ 224.232352] do_filp_open+0xa2/0x100 [ 224.232355] ? __slab_alloc.isra.87.constprop.99+0x36/0x40 [ 224.232357] ? __slab_alloc.isra.87.constprop.99+0x36/0x40 [ 224.232359] ? getname_flags+0x32/0x170 [ 224.232361] ? alloc_fd+0xe2/0x1b0 [ 224.232363] ? do_sys_openat2+0x248/0x310 [ 224.232365] do_sys_openat2+0x248/0x310 [ 224.232368] do_sys_open+0x47/0x60 [ 224.232370] do_syscall_64+0x37/0x80 [ 224.232373] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 224.232376] RIP: 0033:0x7f88ff54ab41 [ 224.232378] Code: 41 83 e2 40 48 89 54 24 30 75 3e 89 f0 25 00 00 41 00 = 3d 00 00 41 00 74 30 89 f2 b8 01 01 00 00 48 89 fe bf 9c ff ff ff 0f 05 <48= > 3d 00 f0 ff ff 77 3f 48 8b 4c 24 18 64 48 33 0c 25 28 00 00 00 [ 224.232379] RSP: 002b:00007ffc0916a720 EFLAGS: 00000287 ORIG_RAX: 000000= 0000000101 [ 224.232381] RAX: ffffffffffffffda RBX: 0000558d793efcf0 RCX: 00007f88ff5= 4ab41 [ 224.232382] RDX: 0000000000080000 RSI: 0000558d793efcb0 RDI: 00000000fff= fff9c [ 224.232383] RBP: 00007ffc0916a860 R08: 0000000000000000 R09: 00007ffc091= 6a873 [ 224.232384] R10: 0000000000000000 R11: 0000000000000287 R12: 0000558d793= efa88 [ 224.232385] R13: 000000000000000b R14: 0000558d793efa60 R15: 00000000000= 0000b [ 224.232387] ---[ end trace 0000000000000002 ]--- ... [ 2010.420941] general protection fault, maybe for address 0xffffea00054ca3= 98: 0000 [#1] PREEMPT_RT SMP NOPTI [ 2010.420946] CPU: 4 PID: 17541 Comm: dd Kdump: loaded Tainted: G W= E 5.13.0.g60ab3ed-tip-rt-slub #25 [ 2010.420948] Hardware name: MEDION MS-7848/MS-7848, BIOS M7848W08.20C 09/= 23/2013 [ 2010.420949] RIP: 0010:___slab_alloc.constprop.100+0x52b/0x13a0 [ 2010.420955] Code: b7 44 24 2a 31 db 66 25 ff 7f 66 89 45 b8 48 8b 45 88 = 80 4d bb 80 48 8b 4d b8 f6 40 0b 40 0f 84 5b 02 00 00 48 89 f0 4c 89 fa 49 0f c7 4c 24 20 0f 84 8f 01 00 00 4d 89 ce f3 90 48 8b b5 30 [ 2010.420957] RSP: 0018:ffff888102cf7ba0 EFLAGS: 00010002 [ 2010.420959] RAX: ffff888100047e00 RBX: 0000000000000000 RCX: 00000000800= 00000 [ 2010.420961] RDX: 0000000000000000 RSI: ffff888100047e00 RDI: ffff8881000= 40f80 [ 2010.420962] RBP: ffff888102cf7c70 R08: ffffffffffffffff R09: 00000000000= 00000 [ 2010.420963] R10: ffff888102cf7c90 R11: 0000000000000000 R12: ffffea00054= ca378 [ 2010.420964] R13: 0000000000000000 R14: 80000000000101f8 R15: 00000000000= 00000 [ 2010.420966] FS: 00007f9e8edbb580(0000) GS:ffff88840ed00000(0000) knlGS:= 0000000000000000 [ 2010.420967] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2010.420968] CR2: 00007f9e8edfa000 CR3: 0000000102ede004 CR4: 00000000001= 706e0 [ 2010.420970] Call Trace: [ 2010.420973] ? __alloc_file+0x26/0xf0 [ 2010.420977] ? prep_new_page+0xab/0x100 [ 2010.420982] ? vm_area_alloc+0x1a/0x60 [ 2010.420984] ? __alloc_file+0x26/0xf0 [ 2010.420987] ? __slab_alloc.isra.87.constprop.99+0x2e/0x40 [ 2010.420989] __slab_alloc.isra.87.constprop.99+0x2e/0x40 [ 2010.420992] ? __alloc_file+0x26/0xf0 [ 2010.420994] kmem_cache_alloc+0x4d/0x160 [ 2010.420996] __alloc_file+0x26/0xf0 [ 2010.420999] alloc_empty_file+0x43/0xe0 [ 2010.421002] path_openat+0x35/0xe30 [ 2010.421004] ? getname_flags+0x32/0x170 [ 2010.421006] ? ___slab_alloc.constprop.100+0xbbb/0x13a0 [ 2010.421008] ? filemap_map_pages+0xf0/0x3e0 [ 2010.421012] do_filp_open+0xa2/0x100 [ 2010.421015] ? __handle_mm_fault+0x8b8/0xa40 [ 2010.421017] ? __slab_alloc.isra.87.constprop.99+0x36/0x40 [ 2010.421019] ? __slab_alloc.isra.87.constprop.99+0x36/0x40 [ 2010.421021] ? getname_flags+0x32/0x170 [ 2010.421023] ? alloc_fd+0xe2/0x1b0 [ 2010.421026] ? do_sys_openat2+0x248/0x310 [ 2010.421028] do_sys_openat2+0x248/0x310 [ 2010.421030] do_sys_open+0x47/0x60 [ 2010.421033] do_syscall_64+0x37/0x80 [ 2010.421035] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 2010.421039] RIP: 0033:0x7f9e8e8fcb41 [ 2010.421041] Code: 41 83 e2 40 48 89 54 24 30 75 3e 89 f0 25 00 00 41 00 = 3d 00 00 41 00 74 30 89 f2 b8 01 01 00 00 48 89 fe bf 9c ff ff ff 0f 05 <48= > 3d 00 f0 ff ff 77 3f 48 8b 4c 24 18 64 48 33 0c 25 28 00 00 00 [ 2010.421043] RSP: 002b:00007ffe8964b7b0 EFLAGS: 00000287 ORIG_RAX: 000000= 0000000101 [ 2010.421044] RAX: ffffffffffffffda RBX: 0000562e1e31b450 RCX: 00007f9e8e8= fcb41 [ 2010.421045] RDX: 0000000000080000 RSI: 0000562e1e31b230 RDI: 00000000fff= fff9c [ 2010.421047] RBP: 00007ffe8964b8f0 R08: 0000000000000000 R09: 00007ffe896= 4b903 [ 2010.421048] R10: 0000000000000000 R11: 0000000000000287 R12: 0000562e1e3= 1b400 [ 2010.421049] R13: 0000000000000009 R14: 0000562e1e31b3e0 R15: 00000000000= 00009 [ 2010.421051] Modules linked in: zram(E) sr_mod(E) cdrom(E) btrfs(E) blake= 2b_generic(E) xor(E) raid6_pq(E) xfs(E) libcrc32c(E) af_packet(E) ip6table_= mangle(E) ip6table_raw(E) iptable_raw(E) bridge(E) stp(E) llc(E) iscsi_ibft= (E) iscsi_boot_sysfs(E) nfnetlink(E) ebtable_filter(E) rfkill(E) ebtables(E= ) ip6table_filter(E) ip6_tables(E) iptable_filter(E) ip_tables(E) x_tables(= E) bpfilter(E) joydev(E) usblp(E) intel_rapl_msr(E) intel_rapl_common(E) nl= s_iso8859_1(E) nls_cp437(E) x86_pkg_temp_thermal(E) intel_powerclamp(E) cor= etemp(E) kvm_intel(E) kvm(E) snd_hda_codec_realtek(E) snd_hda_codec_generic= (E) ledtrig_audio(E) snd_hda_codec_hdmi(E) irqbypass(E) crct10dif_pclmul(E)= crc32_pclmul(E) ghash_clmulni_intel(E) snd_hda_intel(E) aesni_intel(E) snd= _intel_dspcfg(E) crypto_simd(E) iTCO_wdt(E) at24(E) intel_pmc_bxt(E) regmap= _i2c(E) mei_hdcp(E) iTCO_vendor_support(E) cryptd(E) snd_hda_codec(E) snd_h= wdep(E) pcspkr(E) i2c_i801(E) snd_hda_core(E) i2c_smbus(E) r8169(E) snd_pcm= (E) realtek(E) snd_timer(E) [ 2010.421093] mei_me(E) mdio_devres(E) lpc_ich(E) snd(E) libphy(E) mei(E)= soundcore(E) mfd_core(E) fan(E) thermal(E) nfsd(E) intel_smartconnect(E) a= uth_rpcgss(E) nfs_acl(E) lockd(E) grace(E) sch_fq_codel(E) sunrpc(E) fuse(E= ) configfs(E) hid_logitech_hidpp(E) hid_logitech_dj(E) uas(E) usb_storage(E= ) hid_generic(E) usbhid(E) nouveau(E) wmi(E) drm_ttm_helper(E) ttm(E) i2c_a= lgo_bit(E) drm_kms_helper(E) syscopyarea(E) sysfillrect(E) sysimgblt(E) fb_= sys_fops(E) cec(E) ahci(E) rc_core(E) xhci_pci(E) ehci_pci(E) libahci(E) xh= ci_hcd(E) ehci_hcd(E) drm(E) libata(E) usbcore(E) video(E) button(E) sd_mod= (E) t10_pi(E) vfat(E) fat(E) virtio_blk(E) virtio_mmio(E) virtio_ring(E) vi= rtio(E) ext4(E) crc32c_intel(E) crc16(E) mbcache(E) jbd2(E) sg(E) dm_multip= ath(E) dm_mod(E) scsi_dh_rdac(E) scsi_dh_emc(E) scsi_dh_alua(E) scsi_mod(E)= msr(E) autofs4(E) [last unloaded: zram] [ 2010.421138] Dumping ftrace buffer: [ 2010.421141] (ftrace buffer empty)