Messages in this thread | | | From | "Nick Piggin" <> | Subject | kswapd using all cpu for long periods in 2.4.9-pre4 | Date | Wed, 15 Aug 2001 19:05:08 +1000 |
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Hi, Somewhere between 2.4.8 and 2.4.9-pre4 kswapd developed a problem. Actually it looks like it is related to the changes in do_try_to_free_pages...
kswapd is using all cpu for long periods (100-200 seconds then 100-200 seconds break....) there is very little disk activity (heres a vmstat while its happening)
0 0 1 18372 1872 1628 38540 1 0 4 2 343 127 1 96 3 0 0 1 18360 1992 1628 38416 0 0 0 3 282 120 0 100 0 0 0 1 18312 2188 1632 38244 1 0 31 6 376 147 1 89 10 0 0 1 18324 1908 1632 38252 0 0 0 3 411 130 0 99 0 0 0 1 18324 1996 1632 38260 0 0 1 1 175 115 0 100 0 0 0 1 18324 1852 1632 38336 17 0 36 8 150 163 0 100 0 0 0 1 18324 2028 1632 38336 0 0 0 8 107 119 0 100 0
kswapd task: Trace; c0145328 <shrink_icache_memory+18/30> Trace; c012b850 <do_try_to_free_pages+60/c0> Trace; c012b90e <kswapd+5e/c0> Trace; c0105000 <_stext+0/0> Trace; c0105000 <_stext+0/0> Trace; c01054d6 <kernel_thread+26/30> Trace; c012b8b0 <kswapd+0/c0>
meminfo just before kswapd goes crazy: Mem-info: Free pages: 4616kB ( 0kB HighMem) ( Active: 6707, inactive_dirty: 4312, inactive_clean: 895, free: 1154 (256 512 2048) ) 5*4kB 1*8kB 1*16kB 1*32kB 1*64kB 1*128kB 1*256kB 1*512kB 0*1024kB 0*2048kB = 1036kB) 483*4kB 104*8kB 5*16kB 1*32kB 1*64kB 1*128kB 0*256kB 1*512kB 0*1024kB 0*2048kB = 3580kB) = 0kB) Swap cache: add 16566, delete 14047, find 17323/32269 Free swap: 110016kB 16368 pages of RAM 0 pages of HIGHMEM 689 reserved pages 10205 pages shared 2519 pages swap cached 0 pages in page table cache Buffer memory: 1472kB
mem info during: SysRq: Show Memory Mem-info: Free pages: 3744kB ( 0kB HighMem) ( Active: 6946, inactive_dirty: 4296, inactive_clean: 895, free: 936 (256 512 2048) ) 5*4kB 1*8kB 1*16kB 1*32kB 1*64kB 1*128kB 1*256kB 1*512kB 0*1024kB 0*2048kB = 1036kB) 263*4kB 105*8kB 5*16kB 1*32kB 1*64kB 1*128kB 0*256kB 1*512kB 0*1024kB 0*2048kB = 2708kB) = 0kB) Swap cache: add 16680, delete 14047, find 17408/32591 Free swap: 110016kB 16368 pages of RAM 0 pages of HIGHMEM 689 reserved pages 10453 pages shared 2633 pages swap cached 0 pages in page table cache Buffer memory: 1480kB
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