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| author | Bobi Jam <bobijam.xu@intel.com> | 2016-11-02 21:25:02 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-11-07 11:36:46 +0100 |
| commit | 4a21aef42fc71e192dc10496e7ce004a3cd986d8 (patch) | |
| tree | c6a308879c79fcaa9524e4cf9558691748f608c0 /drivers/staging/lustre/lustre/llite/rw.c | |
| parent | 9cc58f1eba46cbaafbc5eb0b519ba26ac1d0d26a (diff) | |
| download | op-kernel-dev-4a21aef42fc71e192dc10496e7ce004a3cd986d8.zip op-kernel-dev-4a21aef42fc71e192dc10496e7ce004a3cd986d8.tar.gz | |
staging/lustre/llite: update ras window correctly
When stride-RA hit case miss, we only reset normal sequential
read-ahead window, but not reset the stride IO to avoid the overhead
of re-detecting stride IO. While when the normal RA window is set
to not insect with the stride-RA window, when we try to increase
the stride-RA window length later, the presumption does not hold.
This patch resets the stride IO as well in this case.
Signed-off-by: Bobi Jam <bobijam.xu@intel.com>
Reviewed-on: http://review.whamcloud.com/23032
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-8683
Reviewed-by: wangdi <di.wang@intel.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/lustre/lustre/llite/rw.c')
| -rw-r--r-- | drivers/staging/lustre/lustre/llite/rw.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/drivers/staging/lustre/lustre/llite/rw.c b/drivers/staging/lustre/lustre/llite/rw.c index d2515a8..e34017d 100644 --- a/drivers/staging/lustre/lustre/llite/rw.c +++ b/drivers/staging/lustre/lustre/llite/rw.c @@ -809,13 +809,20 @@ static void ras_update(struct ll_sb_info *sbi, struct inode *inode, if (ra_miss) { if (index_in_stride_window(ras, index) && stride_io_mode(ras)) { - /*If stride-RA hit cache miss, the stride dector - *will not be reset to avoid the overhead of - *redetecting read-ahead mode - */ if (index != ras->ras_last_readpage + 1) ras->ras_consecutive_pages = 0; ras_reset(inode, ras, index); + + /* If stride-RA hit cache miss, the stride + * detector will not be reset to avoid the + * overhead of redetecting read-ahead mode, + * but on the condition that the stride window + * is still intersect with normal sequential + * read-ahead window. + */ + if (ras->ras_window_start < + ras->ras_stride_offset) + ras_stride_reset(ras); RAS_CDEBUG(ras); } else { /* Reset both stride window and normal RA |
