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17 May 2024, 11:00:25 UTC
Revision 898310032b96c198014a8bbace0fd26259b2db77 authored by OGAWA Hirofumi on 04 June 2020, 23:50:59 UTC, committed by Linus Torvalds on 05 June 2020, 02:06:25 UTC 
fat: improve the readahead for FAT entries
 
Current readahead for FAT entries is very simple but is having some flaws,
so it is not working well for some environments.  This patch improves the
readahead more or less.

The key points of modification are,

  - make the readahead size tunable by using bdi->ra_pages
  - care the bdi->io_pages to avoid the small size I/O request
  - update readahead window before fully exhausting

With this patch, on slow USB connected 2TB hdd:

[before]
383.18sec

[after]
51.03sec

Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Tested-by: hyeongseok.kim <hyeongseok.kim@lge.com>
Reviewed-by: hyeongseok.kim <hyeongseok.kim@lge.com>
Link: http://lkml.kernel.org/r/87d08e1dlh.fsf@mail.parknet.co.jp
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent b1b6575
History
Tip revision: 898310032b96c198014a8bbace0fd26259b2db77 authored by OGAWA Hirofumi on 04 June 2020, 23:50:59 UTC
fat: improve the readahead for FAT entries
Tip revision: 8983100
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