> > console-kit-d D df970368 0 2760 1 0x00000000 > > d9aa7c0c 00000046 00000000 df970368 bcc125ae 000002de df9700f0 df9700f0 > > 00000000 d9aa7c50 d9aa7c18 c1212374 d9aa7c48 d9aa7c20 c105b8f3 d9aa7c3c > > c121288c c105b8be c1bfe5f8 0000000e d9aa7c48 d9aa7c64 d9aa7c70 c105baf7 > > Call Trace: > > [<c1212374>] io_schedule+0x47/0x7d > > [<c105b8f3>] sync_page+0x35/0x39 > > [<c121288c>] __wait_on_bit+0x34/0x5b > > [<c105b8be>] ? sync_page+0x0/0x39 > > [<c105baf7>] wait_on_page_bit+0x7a/0x83 > > [<c1033d28>] ? wake_bit_function+0x0/0x37 > > [<c1063610>] shrink_page_list+0x115/0x3c3 > > [<c10511fb>] ? __delayacct_blkio_end+0x2f/0x35 > > [<c1068083>] ? congestion_wait+0x5d/0x67 > > [<c1063ba9>] shrink_inactive_list+0x2eb/0x476 > > [<c105117e>] ? delayacct_end+0x66/0x8d > > [<c1063f69>] shrink_zone+0x235/0x2d6 > > [<c1033cf9>] ? autoremove_wake_function+0x0/0x2f > > [<c10647e8>] do_try_to_free_pages+0x12c/0x229 > > [<c10649ed>] try_to_free_pages+0x6a/0x72 > > [<c1062889>] ? isolate_pages_global+0x0/0x1a2 > > [<c105fc64>] __alloc_pages_nodemask+0x2e8/0x493 > > [<c105fe1e>] __get_free_pages+0xf/0x2c > > [<c1021fb6>] copy_process+0x9e/0xcc5 > > [<c1022cf1>] do_fork+0x114/0x25e > > [<c106b07b>] ? handle_mm_fault+0x499/0x4f6 > > [<c1018239>] ? do_page_fault+0xe4/0x279 > > [<c10372bc>] ? up_read+0x16/0x2a > > [<c1007752>] sys_clone+0x1b/0x20 > > [<c1002765>] ptregs_clone+0x15/0x30 > > [<c12141b5>] ? syscall_call+0x7/0xb > > Many applications (this one and below) are stuck in > wait_on_page_writeback(). I guess this is why "heavy write to > irrelevant partition stalls the whole system". They are stuck on page > allocation. Your 512MB system memory is a bit tight, so reclaim > pressure is a bit high, which triggers the wait-on-writeback logic. I wonder if this hacking patch may help. When creating 300MB dirty file with dd, it is creating continuous region of hard-to-reclaim pages in the LRU list. priority can easily go low when irrelevant applications' direct reclaim run into these regions.. Thanks, Fengguang --- diff --git a/mm/vmscan.c b/mm/vmscan.c index e0e5f15..f7179cf 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1149,7 +1149,7 @@ static unsigned long shrink_inactive_list(unsigned long max_scan, */ if (sc->order > PAGE_ALLOC_COSTLY_ORDER) lumpy_reclaim = 1; - else if (sc->order && priority < DEF_PRIORITY - 2) + else if (sc->order && priority < DEF_PRIORITY / 2) lumpy_reclaim = 1; pagevec_init(&pvec, 1); -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>