path: root/arch/avr32/mm
diff options
authorShaohua Li <>2012-10-08 16:32:19 -0700
committerLinus Torvalds <>2012-10-09 16:22:47 +0900
commit45cac65b0fcd287ebb877b141d40ba9bbe8e5da7 (patch)
tree30ed25c91aaeed153de51a78d171cb14582e383f /arch/avr32/mm
parente79bee24fd6134f90af4228cfebd010136d67631 (diff)
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 <> Cc: Rik van Riel <> Cc: Wu Fengguang <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
Diffstat (limited to 'arch/avr32/mm')
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/avr32/mm/fault.c b/arch/avr32/mm/fault.c
index b92e609..b2f2d2d 100644
--- a/arch/avr32/mm/fault.c
+++ b/arch/avr32/mm/fault.c
@@ -152,6 +152,7 @@ good_area:
if (fault & VM_FAULT_RETRY) {
+ flags |= FAULT_FLAG_TRIED;
* No need to up_read(&mm->mmap_sem) as we would have