Commenting out out_of_memory() function in __alloc_pages()
From: Abu M. Muttalib
Date: Fri Jul 07 2006 - 05:40:46 EST
Hi,
I am getting the Out of memory.
To circumvent the problem, I have commented the call to "out_of_memory(),
and replaced "goto restart" with "goto nopage".
At "nopage:" lable I have added a call to "schedule()" and then "return
NULL" after "schedule()".
I tried the modified kernel with a test application, the test application is
mallocing memory in a loop. Unlike as expected the process gets killed. On
second run of the same application I am getting the page allocation failure
as expected but subsequently the system hangs.
I am attaching the test application and the log herewith.
I am getting this exception with kernel 2.6.13. With kernel
2.4.19-rmka7-pxa1 there was no problem.
Why its so? What can I do to alleviate the OOM problem?
Thanks in anticipation and regards,
Abu.
sh-3.00# ./test1
OOM Test: Counter = 0
....
OOM Test: Counter = 6635
, OOM: Out of Memory would have been called....<4>test1: page allocation failure. order:0, mode:0xd2
Mem-info:
DMA per-cpu:
cpu 0 hot: low 2, high 6, batch 1 used:2
cpu 0 cold: low 0, high 2, batch 1 used:1
Normal per-cpu: empty
HighMem per-cpu: empty
Free pages: 588kB (0kB HighMem)
Active:2178 inactive:230 dirty:0 writeback:0 unstable:0 free:147 slab:367 mapped:2178 pagetables:43
DMA free:588kB min:512kB low:640kB high:768kB active:8712kB inactive:920kB present:16384kB pages_scanned:4851 all_unreclaimable? no
lowmem_reserve[]: 0 0 0
Normal free:0kB min:0kB low:0kB high:0kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 0
HighMem free:0kB min:128kB low:160kB high:192kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 0
DMA: 9*4kB 3*8kB 1*16kB 0*32kB 0*64kB 0*128kB 0*256kB 1*512kB 0*1024kB = 588kB
Normal: empty
HighMem: empty
Swap cache: add 0, delete 0, find 0/0, race 0+0
Free swap = 0kB
Total swap = 0kB
Free swap: 0kB
4096 pages of RAM
218 free pages
625 reserved pages
367 slab pages
0 pages shared
0 pages swap cached
VM: killing process test1
Killed
sh-3.00# ./test1
OOM Test: Counter = 0
....
OOM Test: Counter = 6416
, OOM: Out of Memory would have been called....<4>test1: page allocation failure. order:0, mode:0x201d0
Mem-info:
DMA per-cpu:
cpu 0 hot: low 2, high 6, batch 1 used:2
cpu 0 cold: low 0, high 2, batch 1 used:1
Normal per-cpu: empty
HighMem per-cpu: empty
Free pages: 672kB (0kB HighMem)
Active:2187 inactive:170 dirty:0 writeback:0 unstable:0 free:168 slab:365 mapped:2125 pagetables:43
DMA free:672kB min:512kB low:640kB high:768kB active:8748kB inactive:680kB present:16384kB pages_scanned:2939 all_unreclaimable? no
lowmem_reserve[]: 0 0 0
Normal free:0kB min:0kB low:0kB high:0kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 0
HighMem free:0kB min:128kB low:160kB high:192kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 0
DMA: 28*4kB 6*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 1*512kB 0*1024kB = 672kB
Normal: empty
HighMem: empty
Swap cache: add 0, delete 0, find 0/0, race 0+0
Free swap = 0kB
Total swap = 0kB
Free swap: 0kB
4096 pages of RAM
239 free pages
625 reserved pages
365 slab pages
13 pages shared
0 pages swap cached
Error -5 while decompressing!
c01e42f4(2388)->c0754000(4096)
Error -3 while decompressing!
c01e4c48(2531)->c0caf000(4096)
Error -3 while decompressing!
c01e562b(2643)->c0914000(4096)
, OOM: Out of Memory would have been called....<4>test1: page allocation failure. order:0, mode:0x201d2
Mem-info:
DMA per-cpu:
cpu 0 hot: low 2, high 6, batch 1 used:3
cpu 0 cold: low 0, high 2, batch 1 used:1
Normal per-cpu: empty
HighMem per-cpu: empty
Free pages: 600kB (0kB HighMem)
Active:2267 inactive:113 dirty:0 writeback:0 unstable:0 free:150 slab:365 mapped:2125 pagetables:43
DMA free:600kB min:512kB low:640kB high:768kB active:9068kB inactive:452kB present:16384kB pages_scanned:222 all_unreclaimable? no
lowmem_reserve[]: 0 0 0
Normal free:0kB min:0kB low:0kB high:0kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 0
HighMem free:0kB min:128kB low:160kB high:192kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 0
DMA: 22*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 1*512kB 0*1024kB = 600kB
Normal: empty
HighMem: empty
Swap cache: add 0, delete 0, find 0/0, race 0+0
Free swap = 0kB
Total swap = 0kB
Free swap: 0kB
4096 pages of RAM
222 free pages
625 reserved pages
365 slab pages
13 pages shared
0 pages swap cached
, OOM: Out of Memory would have been called....<4>init: page allocation failure. order:0, mode:0x201d0
Mem-info:
DMA per-cpu:
cpu 0 hot: low 2, high 6, batch 1 used:3
cpu 0 cold: low 0, high 2, batch 1 used:1
Normal per-cpu: empty
HighMem per-cpu: empty
Free pages: 696kB (0kB HighMem)
Active:2220 inactive:136 dirty:0 writeback:0 unstable:0 free:174 slab:365 mapped:2125 pagetables:43
DMA free:696kB min:512kB low:640kB high:768kB active:8880kB inactive:544kB present:16384kB pages_scanned:6729 all_unreclaimable? no
lowmem_reserve[]: 0 0 0
Normal free:0kB min:0kB low:0kB high:0kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 0
HighMem free:0kB min:128kB low:160kB high:192kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 0
DMA: 44*4kB 1*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 1*512kB 0*1024kB = 696kB
Normal: empty
HighMem: empty
Swap cache: add 0, delete 0, find 0/0, race 0+0
Free swap = 0kB
Total swap = 0kB
Free swap: 0kB
4096 pages of RAM
246 free pages
625 reserved pages
365 slab pages
3 pages shared
0 pages swap cached
Error -5 while decompressing!
c01e7949(2386)->c040d000(4096)
Error -3 while decompressing!
c01e829b(2297)->c05e9000(4096)
, OOM: Out of Memory would have been called....<4>init: page allocation failure. order:0, mode:0x201d2
Mem-info:
DMA per-cpu:
cpu 0 hot: low 2, high 6, batch 1 used:4
cpu 0 cold: low 0, high 2, batch 1 used:1
Normal per-cpu: empty
HighMem per-cpu: empty
Free pages: 600kB (0kB HighMem)
Active:2189 inactive:166 dirty:0 writeback:0 unstable:0 free:150 slab:364 mapped:2125 pagetables:43
DMA free:600kB min:512kB low:640kB high:768kB active:8756kB inactive:664kB present:16384kB pages_scanned:7675 all_unreclaimable? no
lowmem_reserve[]: 0 0 0
Normal free:0kB min:0kB low:0kB high:0kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 0
HighMem free:0kB min:128kB low:160kB high:192kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 0
DMA: 20*4kB 1*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 1*512kB 0*1024kB = 600kB
Normal: empty
HighMem: empty
Swap cache: add 0, delete 0, find 0/0, race 0+0
Free swap = 0kB
Total swap = 0kB
Free swap: 0kB
4096 pages of RAM
223 free pages
625 reserved pages
364 slab pages
1 pages shared
0 pages swap cached
, OOM: Out of Memory would have been called....<4>test1: page allocation failure. order:0, mode:0x201d0
Mem-info:
DMA per-cpu:
cpu 0 hot: low 2, high 6, batch 1 used:4
cpu 0 cold: low 0, high 2, batch 1 used:1
Normal per-cpu: empty
HighMem per-cpu: empty
Free pages: 600kB (0kB HighMem)
Active:2291 inactive:64 dirty:0 writeback:0 unstable:0 free:150 slab:364 mapped:2125 pagetables:43
DMA free:600kB min:512kB low:640kB high:768kB active:9164kB inactive:256kB present:16384kB pages_scanned:10106 all_unreclaimable? yes
lowmem_reserve[]: 0 0 0
Normal free:0kB min:0kB low:0kB high:0kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 0
HighMem free:0kB min:128kB low:160kB high:192kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 0
DMA: 20*4kB 1*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 1*512kB 0*1024kB = 600kB
Normal: empty
HighMem: empty
Swap cache: add 0, delete 0, find 0/0, race 0+0
Free swap = 0kB
Total swap = 0kB
Free swap: 0kB
4096 pages of RAM
223 free pages
625 reserved pages
364 slab pages
2 pages shared
0 pages swap cached
, OOM: Out of Memory would have been called....<4>init: page allocation failure. order:0, mode:0x201d2
Mem-info:
DMA per-cpu:
cpu 0 hot: low 2, high 6, batch 1 used:4
cpu 0 cold: low 0, high 2, batch 1 used:0
Normal per-cpu: empty
HighMem per-cpu: empty
Free pages: 512kB (0kB HighMem)
Active:2296 inactive:125 dirty:0 writeback:0 unstable:0 free:128 slab:364 mapped:2127 pagetables:43
DMA free:512kB min:512kB low:640kB high:768kB active:9184kB inactive:500kB present:16384kB pages_scanned:10106 all_unreclaimable? yes
lowmem_reserve[]: 0 0 0
Normal free:0kB min:0kB low:0kB high:0kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 0
HighMem free:0kB min:128kB low:160kB high:192kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 0
DMA: 0*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 1*512kB 0*1024kB = 512kB
Normal: empty
HighMem: empty
Swap cache: add 0, delete 0, find 0/0, race 0+0
Free swap = 0kB
Total swap = 0kB
Free swap: 0kB
4096 pages of RAM
200 free pages
625 reserved pages
364 slab pages
34 pages shared
0 pages swap cached
, OOM: Out of Memory would have been called....<4>init: page allocation failure. order:0, mode:0x201d2
Mem-info:
DMA per-cpu:
cpu 0 hot: low 2, high 6, batch 1 used:4
cpu 0 cold: low 0, high 2, batch 1 used:0
Normal per-cpu: empty
HighMem per-cpu: empty
Free pages: 512kB (0kB HighMem)
Active:2296 inactive:125 dirty:0 writeback:0 unstable:0 free:128 slab:364 mapped:2127 pagetables:43
DMA free:512kB min:512kB low:640kB high:768kB active:9184kB inactive:500kB present:16384kB pages_scanned:10106 all_unreclaimable? yes
lowmem_reserve[]: 0 0 0
Normal free:0kB min:0kB low:0kB high:0kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 0
HighMem free:0kB min:128kB low:160kB high:192kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 0
DMA: 0*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 1*512kB 0*1024kB = 512kB
Normal: empty
HighMem: empty
Swap cache: add 0, delete 0, find 0/0, race 0+0
Free swap = 0kB
Total swap = 0kB
Free swap: 0kB
4096 pages of RAM
200 free pages
625 reserved pages
364 slab pages
34 pages shared
0 pages swap cached
, OOM: Out of Memory would have been called....<4>test1: page allocation failure. order:0, mode:0x201d2
Mem-info:
DMA per-cpu:
cpu 0 hot: low 2, high 6, batch 1 used:4
cpu 0 cold: low 0, high 2, batch 1 used:0
Normal per-cpu: empty
HighMem per-cpu: empty
Free pages: 512kB (0kB HighMem)
Active:2296 inactive:125 dirty:0 writeback:0 unstable:0 free:128 slab:364 mapped:2133 pagetables:43
DMA free:512kB min:512kB low:640kB high:768kB active:9184kB inactive:500kB present:16384kB pages_scanned:10106 all_unreclaimable? yes
lowmem_reserve[]: 0 0 0
Normal free:0kB min:0kB low:0kB high:0kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 0
HighMem free:0kB min:128kB low:160kB high:192kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 0
DMA: 0*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 1*512kB 0*1024kB = 512kB
Normal: empty
HighMem: empty
Swap cache: add 0, delete 0, find 0/0, race 0+0
Free swap = 0kB
Total swap = 0kB
Free swap: 0kB
4096 pages of RAM
200 free pages
625 reserved pages
364 slab pages
40 pages shared
0 pages swap cached
, OOM: Out of Memory would have been called....VM: killing process test1
Attachment:
test1.c
Description: Binary data