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Currently 'perf kmem stat --page' shows total (page) allocation stat by
default, but sometimes one might want to see live (total alloc-only)
requests/pages only. The new --live option does this by subtracting freed
allocation from the stat.
E.g.:
# perf kmem stat --page
SUMMARY (page allocator)
========================
Total allocation requests : 988,858 [ 4,045,368 KB ]
Total free requests : 886,484 [ 3,624,996 KB ]
Total alloc+freed requests : 885,969 [ 3,622,628 KB ]
Total alloc-only requests : 102,889 [ 422,740 KB ]
Total free-only requests : 515 [ 2,368 KB ]
Total allocation failures : 0 [ 0 KB ]
Order Unmovable Reclaimable Movable Reserved CMA/Isolated
----- ------------ ------------ ------------ ------------ ------------
0 172,173 3,083 806,686 . .
1 284 . . . .
2 6,124 58 . . .
3 114 335 . . .
4 . . . . .
5 . . . . .
6 . . . . .
7 . . . . .
8 . . . . .
9 . . 1 . .
10 . . . . .
# perf kmem stat --page --live
SUMMARY (page allocator)
========================
Total allocation requests : 988,858 [ 4,045,368 KB ]
Total free requests : 886,484 [ 3,624,996 KB ]
Total alloc+freed requests : 885,969 [ 3,622,628 KB ]
Total alloc-only requests : 102,889 [ 422,740 KB ]
Total free-only requests : 515 [ 2,368 KB ]
Total allocation failures : 0 [ 0 KB ]
Order Unmovable Reclaimable Movable Reserved CMA/Isolated
----- ------------ ------------ ------------ ------------ ------------
0 2,214 3,025 97,156 . .
1 59 . . . .
2 19 58 . . .
3 23 335 . . .
4 . . . . .
5 . . . . .
6 . . . . .
7 . . . . .
8 . . . . .
9 . . . . .
10 . . . . .
#
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Pekka Enberg <penberg@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Joonsoo Kim <js1304@gmail.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/1429592107-1807-4-git-send-email-namhyung@kernel.org
[ Added examples to the changeset log ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
67 lines
1.4 KiB
Plaintext
67 lines
1.4 KiB
Plaintext
perf-kmem(1)
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============
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NAME
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----
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perf-kmem - Tool to trace/measure kernel memory properties
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SYNOPSIS
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--------
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[verse]
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'perf kmem' {record|stat} [<options>]
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DESCRIPTION
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-----------
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There are two variants of perf kmem:
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'perf kmem record <command>' to record the kmem events
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of an arbitrary workload.
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'perf kmem stat' to report kernel memory statistics.
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OPTIONS
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-------
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-i <file>::
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--input=<file>::
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Select the input file (default: perf.data unless stdin is a fifo)
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-v::
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--verbose::
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Be more verbose. (show symbol address, etc)
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--caller::
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Show per-callsite statistics
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--alloc::
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Show per-allocation statistics
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-s <key[,key2...]>::
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--sort=<key[,key2...]>::
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Sort the output (default: 'frag,hit,bytes' for slab and 'bytes,hit'
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for page). Available sort keys are 'ptr, callsite, bytes, hit,
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pingpong, frag' for slab and 'page, callsite, bytes, hit, order,
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migtype, gfp' for page. This option should be preceded by one of the
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mode selection options - i.e. --slab, --page, --alloc and/or --caller.
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-l <num>::
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--line=<num>::
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Print n lines only
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--raw-ip::
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Print raw ip instead of symbol
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--slab::
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Analyze SLAB allocator events.
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--page::
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Analyze page allocator events
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--live::
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Show live page stat. The perf kmem shows total allocation stat by
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default, but this option shows live (currently allocated) pages
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instead. (This option works with --page option only)
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SEE ALSO
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--------
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linkperf:perf-record[1]
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