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authorShaohua Li <shli@kernel.org>2012-10-09 03:32:19 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-09 11:22:47 +0400
commit45cac65b0fcd287ebb877b141d40ba9bbe8e5da7 (patch)
tree30ed25c91aaeed153de51a78d171cb14582e383f /scripts/link-vmlinux.sh
parente79bee24fd6134f90af4228cfebd010136d67631 (diff)
downloadlinux-45cac65b0fcd287ebb877b141d40ba9bbe8e5da7.tar.xz
readahead: fault retry breaks mmap file read random detection
.fault now can retry. The retry can break state machine of .fault. In filemap_fault, if page is miss, ra->mmap_miss is increased. In the second try, since the page is in page cache now, ra->mmap_miss is decreased. And these are done in one fault, so we can't detect random mmap file access. Add a new flag to indicate .fault is tried once. In the second try, skip ra->mmap_miss decreasing. The filemap_fault state machine is ok with it. I only tested x86, didn't test other archs, but looks the change for other archs is obvious, but who knows :) Signed-off-by: Shaohua Li <shaohua.li@fusionio.com> Cc: Rik van Riel <riel@redhat.com> Cc: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'scripts/link-vmlinux.sh')
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