From: Chen Feng <puck.chen@hisilicon.com>
To: akpm@linux-foundation.org, vbabka@suse.cz, hughd@google.com,
kirill.shutemov@linux.intel.com, mhocko@suse.com,
n-horiguchi@ah.jp.nec.com, mgorman@techsingularity.net,
hannes@cmpxchg.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Cc: Zhuangluan Su <suzhuangluan@hisilicon.com>,
Dan Zhao <dan.zhao@hisilicon.com>,
l00215322 <albert.lubing@hisilicon.com>,
Yiping Xu <xuyiping@hisilicon.com>,
oliver.fu@hisilicon.com, qijiwen@hisilicon.com,
"yudongbin@hisilicon.com" <yudongbin@hisilicon.com>,
saberlily.xia@hisilicon.com
Subject: Is the page always in swapcache?
Date: Fri, 22 Apr 2016 15:39:53 +0800 [thread overview]
Message-ID: <5719D549.6020400@hisilicon.com> (raw)
Hi Matainers,
In the file mm/migrate.c
316 int migrate_page_move_mapping(struct address_space *mapping,
317 struct page *newpage, struct page *page,
318 struct buffer_head *head, enum migrate_mode mode,
319 int extra_count)
320 {
321 struct zone *oldzone, *newzone;
322 int dirty;
323 int expected_count = 1 + extra_count;
324 void **pslot;
....
344
345 pslot = radix_tree_lookup_slot(&mapping->page_tree,
346 page_index(page));
347
348 expected_count += 1 + page_has_private(page);
349 if (page_count(page) != expected_count ||
350 radix_tree_deref_slot_protected(pslot, &mapping->tree_lock) != page) {
...
353 }
In the line 345, Is the page is always in the swap-cache?
I got the follow crash issue with compaction.
[ 4433.467956s][2016:04:13 11:06:41][pid:324,cpu2,lmkd]Unable to handle kernel NULL pointer dereference at virtual address 00000000
[ 4433.467987s][2016:04:13 11:06:41][pid:324,cpu2,lmkd]pgd = ffffffc0b46f9000
[ 4433.467987s][00000000] *pgd=0000000000000000
[ 4433.468017s][2016:04:13 11:06:41][pid:324,cpu2,lmkd]Internal error: Oops: 96000005 [#1] PREEMPT SMP
[ 4433.468048s]Modules linked in:
[ 4433.468078s][2016:04:13 11:06:41][pid:324,cpu2,lmkd]CPU: 2 PID: 324 Comm: lmkd Tainted: G W 3.10.94-g0daa20e #1
[ 4433.468109s][2016:04:13 11:06:41][pid:324,cpu2,lmkd]task: ffffffc0b7783980 ti: ffffffc0b46c8000 task.ti: ffffffc0b46c8000
[ 4433.468139s][2016:04:13 11:06:41][pid:324,cpu2,lmkd]PC is at migrate_page_move_mapping.part.28+0x7c/0x21c
[ 4433.468170s][2016:04:13 11:06:41][pid:324,cpu2,lmkd]LR is at migrate_page_move_mapping.part.28+0x50/0x21c
[ 4433.468170s][2016:04:13 11:06:41][pid:324,cpu2,lmkd]pc : [<ffffffc0001928b8>] lr : [<ffffffc00019288c>] pstate: 60000185
[ 4433.468200s][2016:04:13 11:06:41][pid:324,cpu2,lmkd]sp : ffffffc0b46cbb20
[ 4433.468200s]x29: ffffffc0b46cbb20 x28: 00000000fffffff5
[ 4433.468231s]x27: ffffffc0bb20b000 x26: 0000000000000000
[ 4433.468261s]x25: 0000000000000000 x24: 0000000000000001
[ 4433.468292s]x23: ffffffc0013be1a8 x22: 0000000000000000
[ 4433.468322s]x21: 0000000000000002 x20: ffffffc0bdbfc900
[ 4433.468353s]x19: ffffffc0bb20b000 x18: 0000000000000000
[ 4433.468353s]x17: 0000000000000000 x16: 0000000000000000
[ 4433.468383s]x15: 0000000000000000 x14: fffffff8fffffff8
[ 4433.468414s]x13: fffffff8fffffff8 x12: fffffff8fffffff8
[ 4433.468444s]x11: fffffff8fffffff8 x10: 00000000ffffffff
[ 4433.468475s]x9 : d61f0220913be210 x8 : ffffffc0ba60ee80
[ 4433.468475s]x7 : 0000000000000006 x6 : 0000000000000001
[ 4433.468505s]x5 : 000001440006010b x4 : 0000000000000001
[ 4433.468536s]x3 : 0000000000000000 x2 : 000001440006010b
[ 4433.468566s]x1 : 000001440006010b x0 : 0000000000000002
[ 4433.468597s][2016:04:13 11:06:41][pid:324,cpu2,lmkd]
[ 4433.468597s]PC: 0xffffffc000192838:
[ 4433.468597s]2838 d65f03c0 a9bb7bfd 910003fd a90363f7 91006017 2a0403f8 a90153f3 a9025bf5
[ 4433.468658s]2858 aa0203f3 aa0003f5 aa1703e0 aa0103f4 a9046bf9 aa0303f9 942c336b f9400260
[ 4433.468719s]2878 910022b5 37880ba0 f9400a61 aa1503e0 9407a477 aa0003fa f9400262 aa1303e0
[ 4433.468780s]2898 f9400261 f274045f 1a9f07f6 11000ad5 37800a81 b9401c00 6b0002bf 540008a1
[ 4433.468811s]28b8 f9400340 eb00027f 54000841 d5033bbf 52800001 91007263 885f7c60 6b15001f
[ 4433.468872s]28d8 54000061 88027c61 35ffff82 d5033bbf 6b0002bf 540006e1 350000d8 b40000b9
[ 4433.468933s]28f8 aa1903e0 97ffff8f 53001c00 34000600 f9400280 378009c0 91007282 885f7c40
[ 4433.468994s]2918 11000400 88017c40 35ffffa1 f9400260 37880420 12000295 37000734 d5033abf
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reply other threads:[~2016-04-22 7:41 UTC|newest]
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