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Date: Wed, 10 Jan 2007 14:04:34 +1100 From: Neil Brown <neilb@...e.de> To: Andrew Morton <akpm@...l.org> Cc: linux-kernel@...r.kernel.org Subject: Re: [PATCH - RFC] allow setting vm_dirty below 1% for large memory machines On Tuesday January 9, akpm@...l.org wrote: > > Could be IO scheduler borkage, could be ext3 borkage. A well-timed sysrq-T > will tell us, and is worth doing (please). The problem has been reported against reiserfs and ext3, and against SLES9 and SLES10. The big machine I can test with is currently running SLES9 (2.6.5 (plus lots of stuff)) and has a reiserfs filesystem. In that config, the blocked process seems to be: Jan 10 02:19:18 macallan kernel: sh D a000000100037b60 0 9852 9815 (NOTLB) Jan 10 02:19:18 macallan kernel: Jan 10 02:19:18 macallan kernel: Call Trace: Jan 10 02:19:18 macallan kernel: [<a000000100098970>] schedule+0xf50/0x2b60 Jan 10 02:19:18 macallan kernel: sp=e000001fe9da79c0 bsp=e000001fe9da1550 Jan 10 02:19:18 macallan kernel: [<a000000100037b60>] __down+0x200/0x320 Jan 10 02:19:18 macallan kernel: sp=e000001fe9da79f0 bsp=e000001fe9da14e8 Jan 10 02:19:18 macallan kernel: [<a00000021c2e0f30>] do_journal_begin_r+0x3b0/0x880 [reiserfs] Jan 10 02:19:18 macallan kernel: sp=e000001fe9da7a20 bsp=e000001fe9da1468 Jan 10 02:19:18 macallan kernel: [<a00000021c2e1920>] journal_begin+0x260/0x360 [reiserfs] Jan 10 02:19:18 macallan kernel: sp=e000001fe9da7a60 bsp=e000001fe9da1430 Jan 10 02:19:18 macallan kernel: [<a00000021c2b0ac0>] reiserfs_dirty_inode+0xe0/0x240 [reiserfs] Jan 10 02:19:18 macallan kernel: sp=e000001fe9da7a60 bsp=e000001fe9da1408 Jan 10 02:19:18 macallan kernel: [<a0000001001c76f0>] __mark_inode_dirty+0x330/0x340 Jan 10 02:19:18 macallan kernel: sp=e000001fe9da7aa0 bsp=e000001fe9da13c0 Jan 10 02:19:18 macallan kernel: [<a0000001001b4400>] __update_atime+0x180/0x200 Jan 10 02:19:18 macallan kernel: sp=e000001fe9da7aa0 bsp=e000001fe9da1380 Jan 10 02:19:18 macallan kernel: [<a000000100111e80>] do_generic_mapping_read+0x8a0/0x1300 Jan 10 02:19:18 macallan kernel: sp=e000001fe9da7ac0 bsp=e000001fe9da12b0 Jan 10 02:19:18 macallan kernel: [<a0000001001141c0>] __generic_file_aio_read+0x2c0/0x400 Jan 10 02:19:18 macallan kernel: sp=e000001fe9da7b20 bsp=e000001fe9da1240 Jan 10 02:19:18 macallan kernel: [<a000000100114550>] generic_file_read+0x110/0x160 Jan 10 02:19:18 macallan kernel: sp=e000001fe9da7b40 bsp=e000001fe9da1200 Jan 10 02:19:18 macallan kernel: [<a00000010016ebb0>] vfs_read+0x250/0x3a0 Jan 10 02:19:18 macallan kernel: sp=e000001fe9da7c30 bsp=e000001fe9da11a8 Jan 10 02:19:18 macallan kernel: [<a00000010018ddb0>] kernel_read+0x50/0x80 Jan 10 02:19:18 macallan kernel: sp=e000001fe9da7c30 bsp=e000001fe9da1168 Jan 10 02:19:18 macallan kernel: [<a00000010018f490>] do_execve+0x210/0x760 Jan 10 02:19:18 macallan kernel: sp=e000001fe9da7c40 bsp=e000001fe9da10e8 Jan 10 02:19:18 macallan kernel: [<a0000001000184a0>] sys_execve+0x60/0xc0 Jan 10 02:19:18 macallan kernel: sp=e000001fe9da7e30 bsp=e000001fe9da10b0 Jan 10 02:19:18 macallan kernel: [<a00000010000f770>] ia64_execve+0x30/0x160 Jan 10 02:19:18 macallan kernel: sp=e000001fe9da7e30 bsp=e000001fe9da1060 Jan 10 02:19:18 macallan kernel: [<a000000100010060>] ia64_ret_from_syscall+0x0/0x20 Jan 10 02:19:18 macallan kernel: sp=e000001fe9da7e30 bsp=e000001fe9da1060 Jan 10 02:19:18 macallan kernel: [<a000000000010640>] 0xa000000000010640 Jan 10 02:19:18 macallan kernel: sp=e000001fe9da8000 bsp=e000001fe9da1060 while the background generate-dirty-data process is: Jan 10 02:19:18 macallan kernel: cp D a000000100037b60 0 9814 9800 (NOTLB) Jan 10 02:19:18 macallan kernel: Jan 10 02:19:18 macallan kernel: Call Trace: Jan 10 02:19:18 macallan kernel: [<a000000100098970>] schedule+0xf50/0x2b60 Jan 10 02:19:18 macallan kernel: sp=e000001fe2f97b50 bsp=e000001fe2f91788 Jan 10 02:19:18 macallan kernel: [<a000000100037b60>] __down+0x200/0x320 Jan 10 02:19:18 macallan kernel: sp=e000001fe2f97b80 bsp=e000001fe2f91720 Jan 10 02:19:18 macallan kernel: [<a00000021c2d6340>] flush_commit_list+0x9e0/0xec0 [reiserfs] Jan 10 02:19:18 macallan kernel: sp=e000001fe2f97bb0 bsp=e000001fe2f91678 Jan 10 02:19:18 macallan kernel: [<a00000021c2d69c0>] flush_older_commits+0x1a0/0x220 [reiserfs] Jan 10 02:19:18 macallan kernel: sp=e000001fe2f97bc0 bsp=e000001fe2f91628 Jan 10 02:19:18 macallan kernel: [<a00000021c2d5f40>] flush_commit_list+0x5e0/0xec0 [reiserfs] Jan 10 02:19:18 macallan kernel: sp=e000001fe2f97bc0 bsp=e000001fe2f91578 Jan 10 02:19:18 macallan kernel: [<a00000021c2e08d0>] do_journal_end+0x18f0/0x1ba0 [reiserfs] Jan 10 02:19:18 macallan kernel: sp=e000001fe2f97bd0 bsp=e000001fe2f91428 Jan 10 02:19:18 macallan kernel: [<a00000021c2980c0>] restart_transaction+0x100/0x1e0 [reiserfs] Jan 10 02:19:18 macallan kernel: sp=e000001fe2f97be0 bsp=e000001fe2f913e8 Jan 10 02:19:18 macallan kernel: [<a00000021c2a1130>] reiserfs_allocate_blocks_for_region+0x410/0x2d40 [reiserfs] Jan 10 02:19:18 macallan kernel: sp=e000001fe2f97be0 bsp=e000001fe2f91300 Jan 10 02:19:18 macallan kernel: [<a00000021c2a45f0>] reiserfs_file_write+0xb90/0x1020 [reiserfs] Jan 10 02:19:18 macallan kernel: sp=e000001fe2f97d10 bsp=e000001fe2f91218 Jan 10 02:19:18 macallan kernel: [<a00000010016e190>] vfs_write+0x250/0x3a0 Jan 10 02:19:18 macallan kernel: sp=e000001fe2f97de0 bsp=e000001fe2f911c0 Jan 10 02:19:18 macallan kernel: [<a00000010016e700>] sys_write+0x140/0x220 and pdflush is doing: Jan 10 02:19:17 macallan kernel: pdflush D a00000010009b410 0 81 10 83 80 (L-TLB) Jan 10 02:19:17 macallan kernel: Jan 10 02:19:17 macallan kernel: Call Trace: Jan 10 02:19:17 macallan kernel: [<a000000100098970>] schedule+0xf50/0x2b60 Jan 10 02:19:17 macallan kernel: sp=e000000039e179f0 bsp=e000000039e11710 Jan 10 02:19:17 macallan kernel: [<a00000010009b410>] io_schedule+0xb0/0x1a0 Jan 10 02:19:17 macallan kernel: sp=e000000039e17a20 bsp=e000000039e116e8 Jan 10 02:19:17 macallan kernel: [<a0000001003e9aa0>] get_request_wait+0x200/0x240 Jan 10 02:19:17 macallan kernel: sp=e000000039e17a20 bsp=e000000039e116a8 Jan 10 02:19:17 macallan kernel: [<a0000001003ea5c0>] __make_request+0x340/0xf40 Jan 10 02:19:17 macallan kernel: sp=e000000039e17a80 bsp=e000000039e11640 Jan 10 02:19:17 macallan kernel: [<a0000001003e6f40>] generic_make_request+0x2c0/0x440 Jan 10 02:19:17 macallan kernel: sp=e000000039e17a90 bsp=e000000039e115f0 Jan 10 02:19:17 macallan kernel: [<a0000001003e7220>] submit_bio+0x160/0x300 Jan 10 02:19:17 macallan kernel: sp=e000000039e17ab0 bsp=e000000039e115b8 Jan 10 02:19:17 macallan kernel: [<a000000100172d40>] submit_bh+0x360/0x420 Jan 10 02:19:17 macallan kernel: sp=e000000039e17ad0 bsp=e000000039e11578 Jan 10 02:19:17 macallan kernel: [<a00000021c2d4330>] write_ordered_chunk+0x110/0x180 [reiserfs] Jan 10 02:19:17 macallan kernel: sp=e000000039e17ad0 bsp=e000000039e11530 Jan 10 02:19:17 macallan kernel: [<a00000021c2d30b0>] add_to_chunk+0xb0/0x140 [reiserfs] Jan 10 02:19:17 macallan kernel: sp=e000000039e17ad0 bsp=e000000039e114e8 Jan 10 02:19:17 macallan kernel: [<a00000021c2d5610>] write_ordered_buffers+0x6d0/0x9c0 [reiserfs] Jan 10 02:19:17 macallan kernel: sp=e000000039e17ad0 bsp=e000000039e11470 Jan 10 02:19:17 macallan kernel: [<a00000021c2d5c10>] flush_commit_list+0x2b0/0xec0 [reiserfs] Jan 10 02:19:17 macallan kernel: sp=e000000039e17c00 bsp=e000000039e113c0 Jan 10 02:19:17 macallan kernel: [<a00000021c2d6ec0>] check_journal_end+0x480/0x740 [reiserfs] Jan 10 02:19:17 macallan kernel: sp=e000000039e17c10 bsp=e000000039e11358 Jan 10 02:19:17 macallan kernel: [<a00000021c2df1c0>] do_journal_end+0x1e0/0x1ba0 [reiserfs] Jan 10 02:19:17 macallan kernel: sp=e000000039e17c10 bsp=e000000039e11208 Jan 10 02:19:17 macallan kernel: [<a00000021c2b0480>] reiserfs_write_super+0x1a0/0x200 [reiserfs] Jan 10 02:19:17 macallan kernel: sp=e000000039e17c20 bsp=e000000039e111e0 Jan 10 02:19:17 macallan kernel: [<a000000100181950>] sync_supers+0x290/0x2a0 Jan 10 02:19:17 macallan kernel: sp=e000000039e17c60 bsp=e000000039e111a0 Jan 10 02:19:17 macallan kernel: [<a000000100121c80>] wb_kupdate+0xa0/0x360 Jan 10 02:19:17 macallan kernel: sp=e000000039e17c60 bsp=e000000039e11148 Jan 10 02:19:17 macallan kernel: [<a000000100122dc0>] pdflush+0x320/0x580 Jan 10 02:19:17 macallan kernel: sp=e000000039e17de0 bsp=e000000039e110b0 Jan 10 02:19:17 macallan kernel: [<a0000001000ddc40>] kthread+0x220/0x280 Jan 10 02:19:17 macallan kernel: sp=e000000039e17e10 bsp=e000000039e11068 Jan 10 02:19:17 macallan kernel: [<a000000100018200>] kernel_thread_helper+0xe0/0x100 Jan 10 02:19:17 macallan kernel: sp=e000000039e17e30 bsp=e000000039e11040 Jan 10 02:19:17 macallan kernel: [<a000000100009060>] start_kernel_thread+0x20/0x40 Jan 10 02:19:17 macallan kernel: sp=e000000039e17e30 bsp=e000000039e11040 I'll see about getting an ext3 trace on a more recent kernel. NeilBrown - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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