[LU-14428] Convert tracefile to use ring_buffer from linux

• Type: Improvement
• Resolution: Unresolved
• Priority: Minor
• Assignee: Neil Brown
• Reporter: Neil Brown

Description

Linux contains a ring_buffer which supports low-overhead appends for messages.

This is similar to the trace log in tracefile.c, but with lower overhead.

Converting to use this removes a lot of code and reduces duplication for when we merge lustre upstream.

 

Issue Links

• has to be done before: LU-16746 Convert tracefile to export debug logs via character device
• is related to: LU-17639 Trace cpu data (tcd) not initialized correctly
• is related to: LU-17418 Lustre crashed immediately after load with debug kernel
• is related to: LU-15306 recovery-small: lightweight client was not recovered
• is related to: LU-17253 Crash dump lustre logs extractor tool
• is related to: LU-8980 Add tracepoint support to Lustre
• is related to: LU-9859 libcfs simplification

Comments

[Gerrit Updater]

"Oleg Drokin <[e-mail]>" merged in patch https://review.whamcloud.com/41493/
Subject: LU-14428 libcfs: separate daemon_list from cfs_trace_data
Project: fs/lustre-release
Branch: master
Current Patch Set:
Commit: 848738a85d82bb71cd91304c60a6a298d854157d

[Gerrit Updater]

Oleg Drokin ([e-mail]) merged in patch https://review.whamcloud.com/41492/
Subject: LU-14428 libcfs: simplify task management in tracefile.c
Project: fs/lustre-release
Branch: master
Current Patch Set:
Commit: 6c5e6dd777a49ab06c38b880990b15393509ca87

[Gerrit Updater]

Oleg Drokin ([e-mail]) merged in patch https://review.whamcloud.com/41491/
Subject: LU-14428 libcfs: discard cfs_trace_allocate_string_buffer
Project: fs/lustre-release
Branch: master
Current Patch Set:
Commit: a7a876a5e44125688a041679c77721416c67bb62

[Gerrit Updater]

Oleg Drokin ([e-mail]) merged in patch https://review.whamcloud.com/41490/
Subject: LU-14428 libcfs: discard cfs_trace_copyin_string()
Project: fs/lustre-release
Branch: master
Current Patch Set:
Commit: 67af976c806994cec27414d24b43f6519d72c240

[Gerrit Updater]

Oleg Drokin ([e-mail]) merged in patch https://review.whamcloud.com/41489/
Subject: LU-14428 libcfs: discard cfs_trace_console_buffers[]
Project: fs/lustre-release
Branch: master
Current Patch Set:
Commit: 95aa713f78e7acf992abda2fbb7242a6d0cc753d

[Gerrit Updater]

Neil Brown ([e-mail]) uploaded a new patch: https://review.whamcloud.com/41493
Subject: LU-14428 libcfs: separate daemon_list from cfs_trace_data
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: a6ad9f712ed5caf1b7cb71d30583a8d879a3e5f7

[Gerrit Updater]

Neil Brown ([e-mail]) uploaded a new patch: https://review.whamcloud.com/41492
Subject: LU-14428 libcfs: simplify task management in tracefile.c
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: ea95f8115713d46bba2bc1d1e39ec3d3bed6baed

[Gerrit Updater]

Neil Brown ([e-mail]) uploaded a new patch: https://review.whamcloud.com/41491
Subject: LU-14428 libcfs: discard cfs_trace_allocate_string_buffer
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: 22693103f08d000e02d5493680d80a2aaa9ec422

[Gerrit Updater]

Neil Brown ([e-mail]) uploaded a new patch: https://review.whamcloud.com/41490
Subject: LU-14428 libcfs: discard cfs_trace_copyin_string()
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: 58cef9a14e19af27b07df7a53a856611f165f54b

[Gerrit Updater]

Neil Brown ([e-mail]) uploaded a new patch: https://review.whamcloud.com/41489
Subject: LU-14428 libcfs: discard cfs_trace_console_buffers[]
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: f7e700300d43421b7cd295c8d5eee87d0ced52bf