[PATCH resend] fadvise: only initiate writeback for specified range with FADV_DONTNEED
From: Shawn Bohrer <hidden>
Date: 2011-11-22 23:01:48
Also in:
lkml
Subsystem:
memory management, memory management - misc, the rest · Maintainers:
Andrew Morton, David Hildenbrand, Linus Torvalds
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 <redacted> --- Andrew is this something you could apply? mm/fadvise.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/mm/fadvise.c b/mm/fadvise.c
index 8d723c9..469491e 100644
--- a/mm/fadvise.c
+++ b/mm/fadvise.c@@ -117,7 +117,8 @@ SYSCALL_DEFINE(fadvise64_64)(int fd, loff_t offset, loff_t len, int advice) 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;
--
1.7.6
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