[LU-18448] Read Directory page on open.

• Type: Improvement
• Resolution: Fixed
• Priority: Major
• Fix Version/s: Lustre 2.17.0
• Severity: 3
• Assignee: Alexey Lyashkov
• Reporter: Alexey Lyashkov

Description

DoM provide a way to readahead for the pages on MDT, it save a time and rpc for MDT.
Directory want to have similar option. It's very useful for small directories and increase a readdir speed for tree walk.

100k directories with 100 files on each.

1. find /mnt/kjlmo2/tests_dir -type d | wc -l
   102731

unpatched.
[root@c-lmo1005 ~]# time /bin/ls -1R /mnt/kjlmo2/tests_dir >& /dev/null
real 1m48.603s

patched
[root@c-lmo1004 ~]# time /bin/ls -1R /mnt/kjlmo2/tests_dir >& /dev/null
real 1m9.564s

Issue Links

• is related to: LU-18892 page_cache_alloc undefined on Ubuntu 24.04.2, kernel 6.11.0

Comments

[Peter Jones]

Merged for 2.17

[Gerrit Updater]

"Oleg Drokin <[e-mail]>" merged in patch https://review.whamcloud.com/c/fs/lustre-release/+/57069/
Subject: LU-18448 llite: read dir on open
Project: fs/lustre-release
Branch: master
Current Patch Set:
Commit: 4a14a51a8e000e05e6a3c0dae7bf64b8d43f8254

[Gerrit Updater]

"Alexey Lyashkov <[e-mail]>" uploaded a new patch: https://review.whamcloud.com/c/fs/lustre-release/+/57069
Subject: LU-18448 llite: read dir on open
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: cfeed43997abfbeb2508d14b9909ff9c8bf690b1