[LU-8683] readahead: update ras window correctly

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.9.0
• Affects Version/s: Lustre 2.9.0
• Severity: 3
• Assignee: Zhenyu Xu
• Reporter: Zhenyu Xu

Description

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.

Comments

[Peter Jones]

Landed for 2.9

[Gerrit Updater]

Oleg Drokin ([e-mail]) merged in patch http://review.whamcloud.com/23032/
Subject: LU-8683 readahead: update ras window correctly
Project: fs/lustre-release
Branch: master
Current Patch Set:
Commit: 9c4b9ba2a32343bb8fae774db4edd7cf2ef9e852

[Gerrit Updater]

Bobi Jam ([e-mail]) uploaded a new patch: http://review.whamcloud.com/23032
Subject: LU-8683 readahead: update ras window correctly
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: 08a42f2e5b24ca8b13d3d80d323a2ad2657b081a