[LU-16697] Lustre should set appropriate BDI_CAP_* and s_iflags for writeback and cgroup wb

• Status: Resolved
• Project: Lustre
• Fix Version/s: Lustre 2.16.0
• Type: Bug
• Priority: Minor
• Reporter: Shaun Tancheff
• Assignee: Shaun Tancheff
• Resolution: Fixed
• Severity: 3

Description

Lustre should set appropriate BDI_CAP_* and s_iflags for writeback and cgroup wb

Issue Links

• is related to: LU-16680 add lowmem sync feature
• is related to: LU-16696 Lustre memcg oom workaround for unpat...
• is related to: LU-16954 mount failed: File exists(cannot crea...
• is related to: LU-16713 Writeback and commit pages under memo...

Comments

[Gerrit Updater]

"Shaun Tancheff <[e-mail]>" uploaded a new patch: https://review.whamcloud.com/c/fs/lustre-release/+/50497
Subject: LU-16697 llite: Set BDI_CAP_* flags for lustre
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: 33896b62aa39e271cdcd4fdc4adb84a3849bdca1

[Patrick Farrell]

Shaun,

Check out LU-16680.  This solves the problem of Lustre working well with cgroups and general memory pressure without subjecting us to the kernel writeback limits, which were a huge problem in the past:

https://review.whamcloud.com/c/fs/lustre-release/+/50460

[Andreas Dilger]

Patrick, do you have a reference on previous problems with the kernel writeback limits? I'm wondering if they show tests and/or monitors we could use to usefully test these new patches?

[Gerrit Updater]

"Oleg Drokin <[e-mail]>" merged in patch https://review.whamcloud.com/c/fs/lustre-release/+/50497/
Subject: LU-16697 llite: Set BDI_CAP_* flags for lustre
Project: fs/lustre-release
Branch: master
Current Patch Set:
Commit: f5a75ea44db32ac27ada327b4752c3bc611cf9df

[Peter Jones]

Landed for 2.16