The patch titled
Subject: fadvise: only initiate writeback for specified range with FADV_DONTNEED
has been added to the -mm tree. Its filename is
fadvise-only-initiate-writeback-for-specified-range-with-fadv_dontneed.patch
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------------------------------------------------------
From: Shawn Bohrer <sbohrer@xxxxxxxxxxxxxxx>
Subject: fadvise: only initiate writeback for specified range with FADV_DONTNEED
Previously POSIX_FADV_DONTNEED would start writeback for the entire file
when the bdi was not write congested. This negatively impacts performance
if the file contians dirty pages outside of the requested range. This
change uses __filemap_fdatawrite_range() to only initiate writeback for
the requested range.
Signed-off-by: Shawn Bohrer <sbohrer@xxxxxxxxxxxxxxx>
Acked-by: Johannes Weiner <jweiner@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/fadvise.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff -puN mm/fadvise.c~fadvise-only-initiate-writeback-for-specified-range-with-fadv_dontneed mm/fadvise.c
--- a/mm/fadvise.c~fadvise-only-initiate-writeback-for-specified-range-with-fadv_dontneed
+++ a/mm/fadvise.c
@@ -117,7 +117,8 @@ SYSCALL_DEFINE(fadvise64_64)(int fd, lof
break;
case POSIX_FADV_DONTNEED:
if (!bdi_write_congested(mapping->backing_dev_info))
- filemap_flush(mapping);
+ __filemap_fdatawrite_range(mapping, offset, endbyte,
+ WB_SYNC_NONE);
/* First and last FULL page! */
start_index = (offset+(PAGE_CACHE_SIZE-1)) >> PAGE_CACHE_SHIFT;
_
Subject: Subject: fadvise: only initiate writeback for specified range with FADV_DONTNEED
Patches currently in -mm which might be from sbohrer@xxxxxxxxxxxxxxx are
fadvise-only-initiate-writeback-for-specified-range-with-fadv_dontneed.patch
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