hi Michal:
> I would just mark NR_FREE_PAGES before and after allocation request.
> Something like:
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index f8f3bfc435ee..a1337aa7e897 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -3565,6 +3565,9 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
> enum compact_result compact_result;
> int compaction_retries = 0;
> int no_progress_loops = 0;
> + unsigned long nr_free_before;
> +
> + nr_free_before = global_page_state(NR_FREE_PAGES);
>
> /*
> * In the slowpath, we sanity check order to avoid ever trying to
> @@ -3624,6 +3627,7 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
> * to fail.
> */
> WARN_ON_ONCE(gfp_mask & __GFP_NOFAIL);
> + pr_info("nr_free_before:%lu nr_free_now:%lu\n", nr_free_before, global_page_state(NR_FREE_PAGES));
> goto nopage;
> }
>
> You can then compare the numbers before after and the allocation failure
> to see whether there is a large gap.
I follow your suggestion to add nr_free_before for comparing when
allocation failure comes out.
from the log, it shows that nr_free_before has lot of free pages and
the value is the same even allocation fail.
It seems there are some other conditions that will let page order =0
with GFP_ATOMIC (mode = 0x20) fail even free pages and pcp is enough.
Sincerely appreciate your kind help,
nr_free_before:14094 nr_free_now:14094
opera_omi: page allocation failure: order:0, mode:0x20
CPU: 0 PID: 20846 Comm: opera_omi Tainted: G O 3.10.0+ #14
Backtrace:
[<c00129f8>] (dump_backtrace+0x0/0x114) from [<c0012c68>] (show_stack+0x20/0x24)
r6:ca01e000 r5:00000000 r4:00000020 r3:271ae71c
[<c0012c48>] (show_stack+0x0/0x24) from [<c056d32c>] (dump_stack+0x24/0x28)
[<c056d308>] (dump_stack+0x0/0x28) from [<c010c668>]
(warn_alloc_failed+0xec/0x128)
[<c010c57c>] (warn_alloc_failed+0x0/0x128) from [<c010fd58>]
(__alloc_pages_nodemask+0x748/0x97c)
r3:00000000 r2:00000000
r7:c07fe240 r6:00000000 r5:00000000 r4:00000020
[<c010f610>] (__alloc_pages_nodemask+0x0/0x97c) from [<c043ec04>]
(__netdev_alloc_frag+0x1cc/0x1e8)
[<c043ea38>] (__netdev_alloc_frag+0x0/0x1e8) from [<c04412cc>]
(__netdev_alloc_skb+0x84/0xe0)
[<c0441248>] (__netdev_alloc_skb+0x0/0xe0) from [<bfbf834c>]
(_rtw_skb_alloc+0x3c/0x40 [8812au])
r6:0000007a r5:d4899168 r4:000000b6 r3:00000100
[<bfbf8310>] (_rtw_skb_alloc+0x0/0x40 [8812au]) from [<bfc0bc80>]
(rtw_os_alloc_recvframe+0x6c/0xfc [8812au])
[<bfc0bc14>] (rtw_os_alloc_recvframe+0x0/0xfc [8812au]) from
[<bfc4ea2c>] (recvbuf2recvframe+0x234/0x388 [8812au])
[<bfc4e7f8>] (recvbuf2recvframe+0x0/0x388 [8812au]) from [<bfbff438>]
(usb_recv_tasklet+0x6c/0x94 [8812au])
[<bfbff3cc>] (usb_recv_tasklet+0x0/0x94 [8812au]) from [<c002de24>]
(tasklet_action+0xa8/0x178)
r7:c07b25ec r6:00000000 r5:d4809b5c r4:d4809b58
[<c002dd7c>] (tasklet_action+0x0/0x178) from [<c002cdd0>]
(__do_softirq+0x164/0x344)
r8:cd919484 r7:00000018 r6:c07b8098 r5:ca01e000 r4:00000006
r3:c002dd7c
[<c002cc6c>] (__do_softirq+0x0/0x344) from [<c002d530>] (irq_exit+0xbc/0xf0)
[<c002d474>] (irq_exit+0x0/0xf0) from [<c000eda0>] (handle_IRQ+0x54/0xa0)
r5:00000056 r4:c07b3f40
[<c000ed4c>] (handle_IRQ+0x0/0xa0) from [<c0008594>] (gic_handle_irq+0x3c/0x6c)
r6:ca01fa00 r5:c07c82cc r4:feffe10c r3:00000000
[<c0008558>] (gic_handle_irq+0x0/0x6c) from [<c0571744>] (__irq_svc+0x44/0x78)
Exception stack(0xca01fa00 to 0xca01fa48)
fa00: cd919484 00000000 deaf1eed 80000001 cd919484 ca01fac0 00003175 00000000
fa20: cd919484 00000000 0000000c ca01fa5c ca01fa60 ca01fa48 c0570e0c c0294ee8
fa40: 880f0153 ffffffff 00000000
r7:ca01fa34 r6:ffffffff r5:880f0153 r4:c0294ee8
[<c0294eb4>] (do_raw_read_lock+0x0/0x54) from [<c0570e0c>]
(_raw_read_lock+0x28/0x2c)
r4:cd919484 r3:00000000
[<c0570de4>] (_raw_read_lock+0x0/0x2c) from [<c01f0940>]
(ext4_es_lookup_extent+0x30/0x1dc)
r4:cd9192c8 r3:00000000
[<c01f0910>] (ext4_es_lookup_extent+0x0/0x1dc) from [<c01b5b18>]
(ext4_map_blocks+0x40/0x4cc)
r8:00000000 r7:00000000 r6:cd9192c8 r5:00000000 r4:ca01fb18
r3:00000000
[<c01b5ad8>] (ext4_map_blocks+0x0/0x4cc) from [<c01b6038>]
(_ext4_get_block+0x94/0x188)
[<c01b5fa4>] (_ext4_get_block+0x0/0x188) from [<c01b6160>]
(ext4_get_block+0x34/0x3c)
r9:00000000 r8:ca01fc40 r7:00000000 r6:00003175 r5:00000001
r4:00000000
[<c01b612c>] (ext4_get_block+0x0/0x3c) from [<c01873e8>]
(do_mpage_readpage+0x5ac/0x748)
[<c0186e3c>] (do_mpage_readpage+0x0/0x748) from [<c0187660>]
(mpage_readpages+0xdc/0x138)
[<c0187584>] (mpage_readpages+0x0/0x138) from [<c01b531c>]
(ext4_readpages+0x50/0x54)
[<c01b52cc>] (ext4_readpages+0x0/0x54) from [<c0113628>]
(__do_page_cache_readahead+0x1ac/0x260)
r6:0000369a r5:00000020 r4:c01b52cc r3:00000014
[<c011347c>] (__do_page_cache_readahead+0x0/0x260) from [<c0113d88>]
(ra_submit+0x38/0x40)
[<c0113d50>] (ra_submit+0x0/0x40) from [<c01097e8>] (filemap_fault+0x3e4/0x438)
[<c0109404>] (filemap_fault+0x0/0x438) from [<c012997c>] (__do_fault+0x80/0x5d4)
[<c01298fc>] (__do_fault+0x0/0x5d4) from [<c012cbe4>]
(handle_pte_fault+0x84/0x6b0)
[<c012cb60>] (handle_pte_fault+0x0/0x6b0) from [<c012d29c>]
(handle_mm_fault+0x8c/0xbc)
[<c012d210>] (handle_mm_fault+0x0/0xbc) from [<c057354c>]
(do_page_fault+0x310/0x428)
[<c057323c>] (do_page_fault+0x0/0x428) from [<c000840c>]
(do_DataAbort+0x48/0xac)
[<c00083c4>] (do_DataAbort+0x0/0xac) from [<c05718dc>] (__dabt_usr+0x3c/0x40)
Exception stack(0xca01ffb0 to 0xca01fff8)
ffa0: 599ccd49 b59735cc 000048c4 b5e3784c
ffc0: 019e6fc8 b5e24cb8 00100080 00000000 be539aec 0196fc00 be5399e0 019e6fc8
ffe0: 00020817 be5398a0 b3bd4765 b3cf394a 280f0170 ffffffff ff131313
r8:be539aec r7:00000000 r6:ffffffff r5:280f0170 r4:b3cf394a
Mem-info:
Normal per-cpu:
CPU 0: hi: 90, btch: 15 usd: 11
CPU 1: hi: 90, btch: 15 usd: 21
HighMem per-cpu:
CPU 0: hi: 18, btch: 3 usd: 1
CPU 1: hi: 18, btch: 3 usd: 2
active_anon:54429 inactive_anon:1744 isolated_anon:0
active_file:2226 inactive_file:3338 isolated_file:0
unevictable:0 dirty:44 writeback:0 unstable:0
free:14094 slab_reclaimable:1380 slab_unreclaimable:6532
mapped:4755 shmem:1772 pagetables:1106 bounce:0
free_cma:13863
Normal free:56088kB min:2000kB low:2500kB high:3000kB
active_anon:148332kB inactive_anon:6040kB active_file:1356kB
inactive_file:5240kB unevictable:0kB isolated(anon):0kB
isolated(file):0kB present:329728kB managed:250408kB mlocked:0kB
dirty:120kB writeback:0kB mapped:8108kB shmem:6136kB
slab_reclaimable:5520kB slab_unreclaimable:26128kB kernel_stack:2720kB
pagetables:4424kB unstable:0kB bounce:0kB free_cma:55452kB
writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 696 696
HighMem free:288kB min:128kB low:304kB high:480kB active_anon:69384kB
inactive_anon:936kB active_file:7548kB inactive_file:8112kB
unevictable:0kB isolated(anon):0kB isolated(file):0kB present:89088kB
managed:89088kB mlocked:0kB dirty:56kB writeback:0kB mapped:10912kB
shmem:952kB slab_reclaimable:0kB slab_unreclaimable:0kB
kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB free_cma:0kB
writeback_tmp:0kB pages_scanned:11 all_unreclaimable? no
lowmem_reserve[]: 0 0 0
Normal: 2152*4kB (UEC) 2157*8kB (UEC) 1889*16kB (UEC) 0*32kB 0*64kB
0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 56088kB
HighMem: 10*4kB (R) 21*8kB (R) 1*16kB (R) 0*32kB 1*64kB (R) 0*128kB
0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 288kB
7360 total pagecache pages
0 pages in swap cache
Swap cache stats: add 0, delete 0, find 0/0
Free swap = 0kB
Total swap = 0kB
RTL871X: rtw_os_alloc_recvframe:can not allocate memory for skb copy
RTL871X: pre_recv_entry()-274: alloc_skb() failed!
[ 6571.049922] nr_free_before:14139 nr_free_now:14139
[ 6571.054710] nr_free_before:14094 nr_free_now:14094
[ 6571.059490] CrBrowserMain: page allocation failure: order:0, mode:0x280020
[ 6571.066345] CPU: 1 PID: 20819 Comm: CrBrowserMain Tainted: G O 3.10.0+ #14
[ 6571.074054] Backtrace:
[ 6571.076529] [<c00129f8>] (dump_backtrace+0x0/0x114) from [<c0012c68>] (show_stack+0x20/0x24)
[ 6571.084932] r6:c262a000 r5:00000000 r4:00280020 r3:271ae71c
[ 6571.090649] [<c0012c48>] (show_stack+0x0/0x24) from [<c056d32c>] (dump_stack+0x24/0x28)
[ 6571.098628] [<c056d308>] (dump_stack+0x0/0x28) from [<c010c668>] (warn_alloc_failed+0xec/0x128)
[ 6571.107305] [<c010c57c>] (warn_alloc_failed+0x0/0x128) from [<c010fd58>] (__alloc_pages_nodemask+0x748/0x97c)
[ 6571.117176] r3:00000000 r2:00000000
[ 6571.120770] r7:c07fe240 r6:00000000 r5:00000000 r4:00280020
[ 6571.126485] [<c010f610>] (__alloc_pages_nodemask+0x0/0x97c) from [<c0141ca4>] (new_slab+0x22c/0x2a8)
[ 6571.135589] [<c0141a78>] (new_slab+0x0/0x2a8) from [<c01440f8>] (__slab_alloc.isra.61.constprop.69+0x588/0x760)
[ 6571.145636] r8:c07c7cc4 r7:cf4fcc00 r6:c1d2aa08 r5:00000020 r4:00000000
[ 6571.152401] [<c0143b70>] (__slab_alloc.isra.61.constprop.69+0x0/0x760) from [<c0144650>] (kmem_cache_alloc+0x184/0x1c0)
[ 6571.163142] [<c01444cc>] (kmem_cache_alloc+0x0/0x1c0) from [<c01efb34>] (__es_insert_extent+0xc4/0x274)
[ 6571.172494] [<c01efa70>] (__es_insert_extent+0x0/0x274) from [<c01f087c>] (ext4_es_insert_extent+0x128/0x134)
[ 6571.182377] [<c01f0754>] (ext4_es_insert_extent+0x0/0x134) from [<c01b5cf8>] (ext4_map_blocks+0x220/0x4cc)
[ 6571.191990] r9:00000000 r8:00000006 r7:00000000 r6:cd9192c8 r5:00000000
r4:c262bb18
[ 6571.199894] [<c01b5ad8>] (ext4_map_blocks+0x0/0x4cc) from [<c01b6038>] (_ext4_get_block+0x94/0x188)
[ 6571.208905] [<c01b5fa4>] (_ext4_get_block+0x0/0x188) from [<c01b6160>] (ext4_get_block+0x34/0x3c)
[ 6571.217737] r9:00000000 r8:c262bc40 r7:00000000 r6:000008a6 r5:00000001
r4:00000000
[ 6571.225648] [<c01b612c>] (ext4_get_block+0x0/0x3c) from [<c01873e8>] (do_mpage_readpage+0x5ac/0x748)
[ 6571.234748] [<c0186e3c>] (do_mpage_readpage+0x0/0x748) from [<c0187660>] (mpage_readpages+0xdc/0x138)
[ 6571.243932] [<c0187584>] (mpage_readpages+0x0/0x138) from [<c01b531c>] (ext4_readpages+0x50/0x54)
[ 6571.252774] [<c01b52cc>] (ext4_readpages+0x0/0x54) from [<c0113628>] (__do_page_cache_readahead+0x1ac/0x260)
[ 6571.262561] r6:0000369a r5:00000020 r4:c01b52cc r3:00000015
[ 6571.268272] [<c011347c>] (__do_page_cache_readahead+0x0/0x260) from [<c0113d88>] (ra_submit+0x38/0x40)
[ 6571.277540] [<c0113d50>] (ra_submit+0x0/0x40) from [<c01097e8>] (filemap_fault+0x3e4/0x438)
[ 6571.285862] [<c0109404>] (filemap_fault+0x0/0x438) from [<c012997c>] (__do_fault+0x80/0x5d4)
[ 6571.294269] [<c01298fc>] (__do_fault+0x0/0x5d4) from [<c012cbe4>] (handle_pte_fault+0x84/0x6b0)
[ 6571.302934] [<c012cb60>] (handle_pte_fault+0x0/0x6b0) from [<c012d29c>] (handle_mm_fault+0x8c/0xbc)
[ 6571.311950] [<c012d210>] (handle_mm_fault+0x0/0xbc) from [<c057354c>] (do_page_fault+0x310/0x428)
[ 6571.320793] [<c057323c>] (do_page_fault+0x0/0x428) from [<c00084b4>] (do_PrefetchAbort+0x44/0xac)
[ 6571.329631] [<c0008470>] (do_PrefetchAbort+0x0/0xac) from [<c0571b3c>] (ret_from_exception+0x0/0x10)
[ 6571.338724] Exception stack(0xc262bfb0 to 0xc262bff8)
[ 6571.343754] bfa0: ab718d50 00000000 00000000 00000000
[ 6571.351903] bfc0: ab718d50 ab7195b8 ab719108 b5e7ccb8 00000000 ab718c98 01120514 0118ca80
[ 6571.360050] bfe0: 00000000 ab718c80 b2e2d945 b30e56d8 40000170 ffffffff 5a5a5a5a
[ 6571.367417] r8:00000000 r7:b5e7ccb8 r6:ffffffff r5:40000170 r4:b30e56d8
[ 6571.374173] Mem-info:
[ 6571.376437] Normal per-cpu:
[ 6571.379220] CPU 0: hi: 90, btch: 15 usd: 11
[ 6571.383988] CPU 1: hi: 90, btch: 15 usd: 21
[ 6571.388757] HighMem per-cpu:
[ 6571.391626] CPU 0: hi: 18, btch: 3 usd: 1
[ 6571.396395] CPU 1: hi: 18, btch: 3 usd: 2
[ 6571.401173] active_anon:54429 inactive_anon:1744 isolated_anon:0
[ 6571.401173] active_file:2226 inactive_file:3338 isolated_file:0
[ 6571.401173] unevictable:0 dirty:44 writeback:0 unstable:0
[ 6571.401173] free:14094 slab_reclaimable:1380 slab_unreclaimable:6532
[ 6571.401173] mapped:4755 shmem:1772 pagetables:1106 bounce:0
[ 6571.401173] free_cma:13863
[ 6571.433364] Normal free:56088kB min:2000kB low:2500kB high:3000kB active_anon:148332kB inactive_anon:6040kB active_file:1356kB inactive_file:5240kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:329728kB managed:250408kB mlocked:0kB dirty:120kB writeback:0kB mapped:8108kB shmem:6136kB slab_reclaimable:5520kB slab_unreclaimable:26128kB kernel_stack:2720kB pagetables:4424kB unstable:0kB bounce:0kB free_cma:55452kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
[ 6571.475821] lowmem_reserve[]: 0 696 696
[ 6571.479723] HighMem free:288kB min:128kB low:304kB high:480kB active_anon:69384kB inactive_anon:936kB active_file:7548kB inactive_file:8112kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:89088kB managed:89088kB mlocked:0kB dirty:56kB writeback:0kB mapped:10912kB shmem:952kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:11 all_unreclaimable? no
[ 6571.520014] lowmem_reserve[]: 0 0 0
[ 6571.523557] Normal: 2152*4kB (UEC) [ 6571.526570] nr_free_before:14094 nr_free_now:14094
[ 6571.526576] nr_free_before:14094 nr_free_now:14094
[ 6571.526581] nr_free_before:14094 nr_free_now:14094
[ 6571.526586] nr_free_before:14094 nr_free_now:14094
[ 6571.526592] opera_omi: page allocation failure: order:0, mode:0x20
[ 6571.526600] CPU: 0 PID: 20846 Comm: opera_omi Tainted: G O 3.10.0+ #14
[ 6571.526605] Backtrace:
[ 6571.526625] [<c00129f8>] (dump_backtrace+0x0/0x114) from [<c0012c68>] (show_stack+0x20/0x24)
[ 6571.526630] r6:ca01e000 r5:00000000 r4:00000020 r3:271ae71c
[ 6571.526654] [<c0012c48>] (show_stack+0x0/0x24) from [<c056d32c>] (dump_stack+0x24/0x28)
[ 6571.526666] [<c056d308>] (dump_stack+0x0/0x28) from [<c010c668>] (warn_alloc_failed+0xec/0x128)
[ 6571.526679] [<c010c57c>] (warn_alloc_failed+0x0/0x128) from [<c010fd58>] (__alloc_pages_nodemask+0x748/0x97c)
[ 6571.526685] r3:00000000 r2:00000000
[ 6571.526691] r7:c07fe240 r6:00000000 r5:00000000 r4:00000020
[ 6571.526711] [<c010f610>] (__alloc_pages_nodemask+0x0/0x97c) from [<c043ec04>] (__netdev_alloc_frag+0x1cc/0x1e8)
[ 6571.526722] [<c043ea38>] (__netdev_alloc_frag+0x0/0x1e8) from [<c04412cc>] (__netdev_alloc_skb+0x84/0xe0)
[ 6571.527153] [<c0441248>] (__netdev_alloc_skb+0x0/0xe0) from [<bfbf834c>] (_rtw_skb_alloc+0x3c/0x40 [8812au])
[ 6571.527162] r6:0000007a r5:d4899168 r4:000000b6 r3:00000100
[ 6571.527577] [<bfbf8310>] (_rtw_skb_alloc+0x0/0x40 [8812au]) from [<bfc0bc80>] (rtw_os_alloc_recvframe+0x6c/0xfc [8812au])
[ 6571.528001] [<bfc0bc14>] (rtw_os_alloc_recvframe+0x0/0xfc [8812au]) from [<bfc4ea2c>] (recvbuf2recvframe+0x234/0x388 [8812au])
[ 6571.528401] [<bfc4e7f8>] (recvbuf2recvframe+0x0/0x388 [8812au]) from [<bfbff438>] (usb_recv_tasklet+0x6c/0x94 [8812au])
[ 6571.528590] [<bfbff3cc>] (usb_recv_tasklet+0x0/0x94 [8812au]) from [<c002de24>] (tasklet_action+0xa8/0x178)
[ 6571.528596] r7:c07b25ec r6:00000000 r5:d4809b5c r4:d4809b58
[ 6571.528614] [<c002dd7c>] (tasklet_action+0x0/0x178) from [<c002cdd0>] (__do_softirq+0x164/0x344)
[ 6571.528619] r8:cd919484 r7:00000018 r6:c07b8098 r5:ca01e000 r4:00000006
[ 6571.528631] r3:c002dd7c
[ 6571.528641] [<c002cc6c>] (__do_softirq+0x0/0x344) from [<c002d530>] (irq_exit+0xbc/0xf0)
[ 6571.528653] [<c002d474>] (irq_exit+0x0/0xf0) from [<c000eda0>] (handle_IRQ+0x54/0xa0)
[ 6571.528658] r5:00000056 r4:c07b3f40
[ 6571.528670] [<c000ed4c>] (handle_IRQ+0x0/0xa0) from [<c0008594>] (gic_handle_irq+0x3c/0x6c)
[ 6571.528674] r6:ca01fa00 r5:c07c82cc r4:feffe10c r3:00000000
[ 6571.528692] [<c0008558>] (gic_handle_irq+0x0/0x6c) from [<c0571744>] (__irq_svc+0x44/0x78)
[ 6571.528698] Exception stack(0xca01fa00 to 0xca01fa48)
[ 6571.528707] fa00: cd919484 00000000 deaf1eed 80000001 cd919484 ca01fac0 00003175 00000000
[ 6571.528716] fa20: cd919484 00000000 0000000c ca01fa5c ca01fa60 ca01fa48 c0570e0c c0294ee8
[ 6571.528722] fa40: 880f0153 ffffffff 00000000
[ 6571.528726] r7:ca01fa34 r6:ffffffff r5:880f0153 r4:c0294ee8
[ 6571.528748] [<c0294eb4>] (do_raw_read_lock+0x0/0x54) from [<c0570e0c>] (_raw_read_lock+0x28/0x2c)
[ 6571.528753] r4:cd919484 r3:00000000
[ 6571.528766] [<c0570de4>] (_raw_read_lock+0x0/0x2c) from [<c01f0940>] (ext4_es_lookup_extent+0x30/0x1dc)
[ 6571.528771] r4:cd9192c8 r3:00000000
[ 6571.528787] [<c01f0910>] (ext4_es_lookup_extent+0x0/0x1dc) from [<c01b5b18>] (ext4_map_blocks+0x40/0x4cc)
[ 6571.528792] r8:00000000 r7:00000000 r6:cd9192c8 r5:00000000 r4:ca01fb18
[ 6571.528804] r3:00000000
[ 6571.528816] [<c01b5ad8>] (ext4_map_blocks+0x0/0x4cc) from [<c01b6038>] (_ext4_get_block+0x94/0x188)
[ 6571.528827] [<c01b5fa4>] (_ext4_get_block+0x0/0x188) from [<c01b6160>] (ext4_get_block+0x34/0x3c)
[ 6571.528832] r9:00000000 r8:ca01fc40 r7:00000000 r6:00003175 r5:00000001
[ 6571.528845] r4:00000000
[ 6571.528859] [<c01b612c>] (ext4_get_block+0x0/0x3c) from [<c01873e8>] (do_mpage_readpage+0x5ac/0x748)
[ 6571.528871] [<c0186e3c>] (do_mpage_readpage+0x0/0x748) from [<c0187660>] (mpage_readpages+0xdc/0x138)
[ 6571.528883] [<c0187584>] (mpage_readpages+0x0/0x138) from [<c01b531c>] (ext4_readpages+0x50/0x54)
[ 6571.528898] [<c01b52cc>] (ext4_readpages+0x0/0x54) from [<c0113628>] (__do_page_cache_readahead+0x1ac/0x260)
[ 6571.528903] r6:0000369a r5:00000020 r4:c01b52cc r3:00000014
[ 6571.528922] [<c011347c>] (__do_page_cache_readahead+0x0/0x260) from [<c0113d88>] (ra_submit+0x38/0x40)
[ 6571.528932] [<c0113d50>] (ra_submit+0x0/0x40) from [<c01097e8>] (filemap_fault+0x3e4/0x438)
[ 6571.528943] [<c0109404>] (filemap_fault+0x0/0x438) from [<c012997c>] (__do_fault+0x80/0x5d4)
[ 6571.528953] [<c01298fc>] (__do_fault+0x0/0x5d4) from [<c012cbe4>] (handle_pte_fault+0x84/0x6b0)
[ 6571.528963] [<c012cb60>] (handle_pte_fault+0x0/0x6b0) from [<c012d29c>] (handle_mm_fault+0x8c/0xbc)
[ 6571.528975] [<c012d210>] (handle_mm_fault+0x0/0xbc) from [<c057354c>] (do_page_fault+0x310/0x428)
[ 6571.528985] [<c057323c>] (do_page_fault+0x0/0x428) from [<c000840c>] (do_DataAbort+0x48/0xac)
[ 6571.528994] [<c00083c4>] (do_DataAbort+0x0/0xac) from [<c05718dc>] (__dabt_usr+0x3c/0x40)
[ 6571.529000] Exception stack(0xca01ffb0 to 0xca01fff8)
[ 6571.529006] ffa0: 599ccd49 b59735cc 000048c4 b5e3784c
[ 6571.529016] ffc0: 019e6fc8 b5e24cb8 00100080 00000000 be539aec 0196fc00 be5399e0 019e6fc8
[ 6571.529024] ffe0: 00020817 be5398a0 b3bd4765 b3cf394a 280f0170 ffffffff ff131313
[ 6571.529028] r8:be539aec r7:00000000 r6:ffffffff r5:280f0170 r4:b3cf394a
[ 6571.529042] Mem-info:
[ 6571.529045] Normal per-cpu:
[ 6571.529050] CPU 0: hi: 90, btch: 15 usd: 11
[ 6571.529056] CPU 1: hi: 90, btch: 15 usd: 21
[ 6571.529059] HighMem per-cpu:
[ 6571.529063] CPU 0: hi: 18, btch: 3 usd: 1
[ 6571.529067] CPU 1: hi: 18, btch: 3 usd: 2
[ 6571.529080] active_anon:54429 inactive_anon:1744 isolated_anon:0
[ 6571.529080] active_file:2226 inactive_file:3338 isolated_file:0
[ 6571.529080] unevictable:0 dirty:44 writeback:0 unstable:0
[ 6571.529080] free:14094 slab_reclaimable:1380 slab_unreclaimable:6532
[ 6571.529080] mapped:4755 shmem:1772 pagetables:1106 bounce:0
[ 6571.529080] free_cma:13863
[ 6571.529104] Normal free:56088kB min:2000kB low:2500kB high:3000kB active_anon:148332kB inactive_anon:6040kB active_file:1356kB inactive_file:5240kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:329728kB managed:250408kB mlocked:0kB dirty:120kB writeback:0kB mapped:8108kB shmem:6136kB slab_reclaimable:5520kB slab_unreclaimable:26128kB kernel_stack:2720kB pagetables:4424kB unstable:0kB bounce:0kB free_cma:55452kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
[ 6571.529118] lowmem_reserve[]: 0 696 696
[ 6571.529142] HighMem free:288kB min:128kB low:304kB high:480kB active_anon:69384kB inactive_anon:936kB active_file:7548kB inactive_file:8112kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:89088kB managed:89088kB mlocked:0kB dirty:56kB writeback:0kB mapped:10912kB shmem:952kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:11 all_unreclaimable? no
[ 6571.529155] lowmem_reserve[]: 0 0 0
[ 6571.529164] Normal: 2152*4kB (UEC) 2157*8kB (UEC) 1889*16kB (UEC) 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 56088kB
[ 6571.529199] HighMem: 10*4kB (R) 21*8kB (R) 1*16kB (R) 0*32kB 1*64kB (R) 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 288kB
[ 6571.529234] 7360 total pagecache pages
[ 6571.529241] 0 pages in swap cache
[ 6571.529245] Swap cache stats: add 0, delete 0, find 0/0
[ 6571.529248] Free swap = 0kB
[ 6571.529250] Total swap = 0kB
[ 6571.529649] RTL871X: rtw_os_alloc_recvframe:can not allocate memory for skb copy
[ 6571.529658] RTL871X: pre_recv_entry()-274: alloc_skb() failed!
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 3366092..5e7487a 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2414,6 +2414,8 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
bool sync_migration = false;
bool deferred_compaction = false;
bool contended_compaction = false;
+ unsigned long nr_free_before;
+ nr_free_before = global_page_state(NR_FREE_PAGES);
/*
* In the slowpath, we sanity check order to avoid ever trying to
@@ -2597,6 +2599,7 @@ rebalance:
}
nopage:
+ printk(KERN_ERR"nr_free_before:%lu nr_free_now:%lu\n", nr_free_before, global_page_state(NR_FREE_PAGES));
warn_alloc_failed(gfp_mask, order, NULL);
return page;
got_pg: