tools/perf/Documentation/perf-kmem.txt

Source file repositories/reference/linux-study-clean/tools/perf/Documentation/perf-kmem.txt

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System
Linux kernel
Corpus path
tools/perf/Documentation/perf-kmem.txt
Extension
.txt
Size
1987 bytes
Lines
81
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: documentation
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

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Annotated Snippet

perf-kmem(1)
============

NAME
----
perf-kmem - Tool to trace/measure kernel memory properties

SYNOPSIS
--------
[verse]
'perf kmem' [<options>] {record|stat}

DESCRIPTION
-----------
There are two variants of perf kmem:

  'perf kmem [<options>] record [<perf-record-options>] <command>' to
  record the kmem events of an arbitrary workload. Additional 'perf
  record' options may be specified after record, such as '-o' to
  change the output file name.

  'perf kmem [<options>] stat' to report kernel memory statistics.

OPTIONS
-------
-i <file>::
--input=<file>::
	For stat, select the input file (default: perf.data unless stdin is a
	fifo)

-f::
--force::
	Don't do ownership validation

-v::
--verbose::
        Be more verbose. (show symbol address, etc)

--caller::
	Show per-callsite statistics

--alloc::
	Show per-allocation statistics

-s <key[,key2...]>::
--sort=<key[,key2...]>::
	Sort the output (default: 'frag,hit,bytes' for slab and 'bytes,hit'
	for page).  Available sort keys are 'ptr, callsite, bytes, hit,
	pingpong, frag' for slab and 'page, callsite, bytes, hit, order,
	migtype, gfp' for page.  This option should be preceded by one of the
	mode selection options - i.e. --slab, --page, --alloc and/or --caller.

-l <num>::
--line=<num>::
	Print n lines only

--raw-ip::
	Print raw ip instead of symbol

--slab::
	Analyze SLAB allocator events.

--page::
	Analyze page allocator events

--live::
	Show live page stat.  The perf kmem shows total allocation stat by
	default, but this option shows live (currently allocated) pages
	instead.  (This option works with --page option only)

Annotation

Implementation Notes