Commit 4a21aef4 authored by Bobi Jam's avatar Bobi Jam Committed by Greg Kroah-Hartman

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: default avatarBobi Jam <bobijam.xu@intel.com>
Reviewed-on: http://review.whamcloud.com/23032
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-8683Reviewed-by: default avatarwangdi <di.wang@intel.com>
Reviewed-by: default avatarJinshan Xiong <jinshan.xiong@intel.com>
Signed-off-by: default avatarOleg Drokin <green@linuxhacker.ru>
Reviewed-by: default avatarJames Simmons <jsimmons@infradead.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 9cc58f1e
...@@ -809,13 +809,20 @@ static void ras_update(struct ll_sb_info *sbi, struct inode *inode, ...@@ -809,13 +809,20 @@ static void ras_update(struct ll_sb_info *sbi, struct inode *inode,
if (ra_miss) { if (ra_miss) {
if (index_in_stride_window(ras, index) && if (index_in_stride_window(ras, index) &&
stride_io_mode(ras)) { 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) if (index != ras->ras_last_readpage + 1)
ras->ras_consecutive_pages = 0; ras->ras_consecutive_pages = 0;
ras_reset(inode, ras, index); 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); RAS_CDEBUG(ras);
} else { } else {
/* Reset both stride window and normal RA /* Reset both stride window and normal RA
......
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