linux-kernel - [PATCH v7 0/2] x86/resctrl: Track llc

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Message-Id: <20240408092303.26413-1-haifeng.xu@shopee.com>
Date: Mon,  8 Apr 2024 17:23:01 +0800
From: Haifeng Xu <haifeng.xu@...pee.com>
To: reinette.chatre@...el.com,
	james.morse@....com
Cc: fenghua.yu@...el.com,
	babu.moger@....com,
	bp@...en8.de,
	tglx@...utronix.de,
	mingo@...hat.com,
	dave.hansen@...ux.intel.com,
	hpa@...or.com,
	peternewman@...gle.com,
	x86@...nel.org,
	linux-kernel@...r.kernel.org,
	corbet@....net,
	linux-doc@...r.kernel.org,
	Haifeng Xu <haifeng.xu@...pee.com>
Subject: [PATCH v7 0/2] x86/resctrl: Track llc_occupancy of RMIDs in limbo list

After removing a monitor group, its RMID may not be freed immediately
unless its llc_occupancy is less than the re-allocation threshold. If
turning up the threshold, the RMID can be reused. In order to know how
much the threshold should be, it's necessary to acquire the llc_occupancy.

The patch series provides a new tracepoint to track the llc_occupancy.

Changes since v1:
- Rename pseudo_lock_event.h instead of creating a new header file.
- Modify names used in the tracepoint.
- Update changelog.

Changes since v2:
- Fix typo and use the x86/resctrl subject prefix in the cover letter.
- Track both CLOSID and RMID in the tracepoint.
- Remove the details on how perf can be used in patch2's changelog.

Changes since v3:
- Put the tracepoint in the 'else' section of the if/else after
  resctrl_arch_rmid_read().
- Modify names used in the tracepoint.
- Document the properties of the tracepoint.

Changes since v4:
- Add Reviewed-by tags.
- Include more maintainers in the submission.

Changes since v5:
- Update the documentation and comments of the tracepoint.
- Code cleanup.

Changes since v6:
- Add Reviewed-by tags.

Haifeng Xu (2):
  x86/resctrl: Rename pseudo_lock_event.h to trace.h
  x86/resctrl: Add tracepoint for llc_occupancy tracking

 Documentation/arch/x86/resctrl.rst            |  6 +++++
 arch/x86/kernel/cpu/resctrl/monitor.c         | 11 +++++++++
 arch/x86/kernel/cpu/resctrl/pseudo_lock.c     |  2 +-
 .../resctrl/{pseudo_lock_event.h => trace.h}  | 24 +++++++++++++++----
 4 files changed, 38 insertions(+), 5 deletions(-)
 rename arch/x86/kernel/cpu/resctrl/{pseudo_lock_event.h => trace.h} (56%)

-- 
2.25.1