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Commit ad8a1b558e6c76fb53901956d3c8f29b82a4ccfa

Authored by Shawn Bohrer
Committed by Linus Torvalds
1 parent fc8d8620d3
Exists in master and in 6 other branches imx_3.10.17_1.0.1_ga, imx_3.10.53_1.1.0_ga, imx_3.14.28_1.0.0_ga, smarc-imx_3.10.53_1.1.0_ga, smarc-imx_3.14.28_1.0.0_ga, smarc-l5.0.0_1.0.0-ga

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 contains 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@rgmadvisors.com>
Acked-by: Johannes Weiner <jweiner@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Showing 1 changed file with 2 additions and 1 deletions Side-by-side Diff

... ... @@ -117,7 +117,8 @@
117 117 break;
118 118 case POSIX_FADV_DONTNEED:
119 119 if (!bdi_write_congested(mapping->backing_dev_info))
120   - filemap_flush(mapping);
  120 + __filemap_fdatawrite_range(mapping, offset, endbyte,
  121 + WB_SYNC_NONE);
121 122  
122 123 /* First and last FULL page! */
123 124 start_index = (offset+(PAGE_CACHE_SIZE-1)) >> PAGE_CACHE_SHIFT;