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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>
This commit is contained in:
Bobi Jam 2016-11-02 21:25:02 -04:00 committed by Greg Kroah-Hartman
parent 9cc58f1eba
commit 4a21aef42f
1 changed files with 11 additions and 4 deletions
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15
drivers/staging/lustre/lustre/llite/rw.c
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@ -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