Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265384AbUAMX0c (ORCPT ); Tue, 13 Jan 2004 18:26:32 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265406AbUAMX0c (ORCPT ); Tue, 13 Jan 2004 18:26:32 -0500 Received: from amsfep12-int.chello.nl ([213.46.243.18]:62225 "EHLO amsfep12-int.chello.nl") by vger.kernel.org with ESMTP id S265384AbUAMX01 (ORCPT ); Tue, 13 Jan 2004 18:26:27 -0500 Date: Wed, 14 Jan 2004 00:26:24 +0100 From: Haakon Riiser To: linux-kernel@vger.kernel.org Subject: Re: Busy-wait delay in qmail 1.03 after upgrading to Linux 2.6 Message-ID: <20040113232624.GA302@s.chello.no> Mail-Followup-To: linux-kernel@vger.kernel.org References: <20040113210923.GA955@s.chello.no> <20040113135152.3ed26b85.akpm@osdl.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20040113135152.3ed26b85.akpm@osdl.org> User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3464 Lines: 72 [Andrew Morton] > Seems innocuous. What filesystem type is lock/trigger on? Reiserfs. > Can you generate a kernel profile of this activity? Done. Note that I had to reboot to do the profiling, so the delay is not as bad as the first example: 344 00:19:07.476825 write(5, "\0", 1) = 1 <0.291500> Still around 700 times slower than 2.4 though. :-) Anyway, here are the results: Output from time: real 0m0.309s user 0m0.011s sys 0m0.004s Data in prof.time: c0117440 do_page_fault 2 0.0015 c01196e0 __wake_up 2 0.0208 c0139d80 free_hot_cold_page 2 0.0078 c0139ea0 buffered_rmqueue 2 0.0057 c013d650 kmem_cache_free 2 0.0250 c0141e10 page_address 2 0.0104 c0142a20 zap_pte_range 2 0.0046 c0145670 __insert_vm_struct 2 0.0139 c0146300 find_vma 2 0.0208 c0151860 dentry_open 2 0.0038 c0153760 fget 2 0.0312 c0168e90 locks_remove_posix 2 0.0074 c016dbb0 dnotify_flush 2 0.0104 c0210f40 decrement_counters_in_path 2 0.0250 c022bd90 atomic_dec_and_lock 2 0.0250 c022c340 strncpy_from_user 2 0.0179 c0120b00 current_kernel_time 3 0.0469 c013d6a0 kfree 3 0.0268 c0144040 do_anonymous_page 3 0.0057 c0153640 __fput 3 0.0104 c015f640 pipe_poll 3 0.0234 c0161660 may_open 3 0.0065 c01654f0 __pollwait 3 0.0144 c01655c0 max_select_fd 3 0.0134 c022c650 __copy_from_user_ll 3 0.0170 c0145490 find_vma_prepare 4 0.0357 c0145ab0 do_mmap_pgoff 4 0.0022 c0182190 write_profile 4 0.0625 c0211030 is_leaf 4 0.0086 c0155230 __find_get_block 5 0.0223 c02112a0 is_tree_node 6 0.0536 c022c5d0 __copy_to_user_ll 6 0.0469 c01606a0 link_path_walk 8 0.0035 c01656a0 do_select 9 0.0125 c01659a0 sys_select 9 0.0070 c016aaa0 __d_lookup 10 0.0298 c0109174 system_call 16 0.3636 c0211310 search_by_key 16 0.0044 c022c0b0 fast_clear_page 21 0.2188 00000000 total 232 0.0001 -- Haakon - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/