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shmem: fix init_page_accessed use to stop !PageLRU bug

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Under shmem swapping load, I sometimes hit the VM_BUG_ON_PAGE(!PageLRU)
in isolate_lru_pages() at mm/vmscan.c:1281!

Commit 2457aec637 ("mm: non-atomically mark page accessed during page
cache allocation where possible") looks like interrupted work-in-progress.

mm/filemap.c's call to init_page_accessed() is fine, but not mm/shmem.c's
- shmem_write_begin() is clearly wrong to use it after shmem_getpage(),
when the page is always visible in radix_tree, and often already on LRU.

Revert change to shmem_write_begin(), and use init_page_accessed() or
mark_page_accessed() appropriately for SGP_WRITE in shmem_getpage_gfp().

SGP_WRITE also covers shmem_symlink(), which did not mark_page_accessed()
before; but since many other filesystems use [__]page_symlink(), which did
and does mark the page accessed, consider this as rectifying an oversight.

Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Prabhakar Lad <prabhakar.csengg@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Hugh Dickins 2014-07-02 15:22:38 -07:00 committed by Linus Torvalds
parent d18bbc215f
commit 66d2f4d28c
1 changed files with 10 additions and 5 deletions
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15
mm/shmem.c
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@ -1029,6 +1029,9 @@ repeat:
goto failed;
}
if (page && sgp == SGP_WRITE)
mark_page_accessed(page);
/* fallocated page? */
if (page && !PageUptodate(page)) {
if (sgp != SGP_READ)
@ -1110,6 +1113,9 @@ repeat:
shmem_recalc_inode(inode);
spin_unlock(&info->lock);
if (sgp == SGP_WRITE)
mark_page_accessed(page);
delete_from_swap_cache(page);
set_page_dirty(page);
swap_free(swap);
@ -1136,6 +1142,9 @@ repeat:
__SetPageSwapBacked(page);
__set_page_locked(page);
if (sgp == SGP_WRITE)
init_page_accessed(page);
error = mem_cgroup_charge_file(page, current->mm,
gfp & GFP_RECLAIM_MASK);
if (error)
@ -1412,13 +1421,9 @@ shmem_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata)
{
int ret;
struct inode *inode = mapping->host;
pgoff_t index = pos >> PAGE_CACHE_SHIFT;
ret = shmem_getpage(inode, index, pagep, SGP_WRITE, NULL);
if (ret == 0 && *pagep)
init_page_accessed(*pagep);
return ret;
return shmem_getpage(inode, index, pagep, SGP_WRITE, NULL);
}
static int