mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-30 14:36:46 +07:00
2a865bd8dd
Add option to allow user to control analysis window. e.g., collect data
for time window and analyze a segment of interest within that window.
Committer notes:
Testing it:
# perf kmem record usleep 1
[ perf record: Woken up 0 times to write data ]
[ perf record: Captured and wrote 1.540 MB perf.data (2049 samples) ]
# perf evlist
kmem:kmalloc
kmem:kmalloc_node
kmem:kfree
kmem:kmem_cache_alloc
kmem:kmem_cache_alloc_node
kmem:kmem_cache_free
# Tip: use 'perf evlist --trace-fields' to show fields for tracepoint events
#
# # Use 'perf script' to get a first approach, select a chunk for then using
# # with 'perf kmem stat --time'
#
# perf script | tail -15
usleep 9889 [0] 20119.782088: kmem:kmem_cache_free: (selinux_file_free_security+0x27) call_site=ffffffffb936aa07 ptr=0xffff888a1df49fc0
perf 9888 [3] 20119.782088: kmem:kmem_cache_free: (jbd2_journal_stop+0x1a1) call_site=ffffffffb9334581 ptr=0xffff888bdf1a39c0
perf 9888 [3] 20119.782089: kmem:kmem_cache_alloc: (jbd2__journal_start+0x72) call_site=ffffffffb9333b42 ptr=0xffff888bdf1a39c0 bytes_req=48 bytes_alloc=48 gfp_flags=GFP_NOFS|__GFP_ZERO
perf 9888 [3] 20119.782090: kmem:kmem_cache_free: (jbd2_journal_stop+0x1a1) call_site=ffffffffb9334581 ptr=0xffff888bdf1a39c0
perf 9888 [3] 20119.782090: kmem:kmem_cache_alloc: (jbd2__journal_start+0x72) call_site=ffffffffb9333b42 ptr=0xffff888bdf1a39c0 bytes_req=48 bytes_alloc=48 gfp_flags=GFP_NOFS|__GFP_ZERO
usleep 9889 [0] 20119.782091: kmem:kmem_cache_alloc: (__sigqueue_alloc+0x4a) call_site=ffffffffb90ad33a ptr=0xffff8889f071f6e0 bytes_req=160 bytes_alloc=160 gfp_flags=GFP_ATOMIC|__GFP_NOTRACK
perf 9888 [3] 20119.782091: kmem:kmem_cache_free: (jbd2_journal_stop+0x1a1) call_site=ffffffffb9334581 ptr=0xffff888bdf1a39c0
perf 9888 [3] 20119.782093: kmem:kmem_cache_free: (__sigqueue_free.part.17+0x33) call_site=ffffffffb90ad3f3 ptr=0xffff8889f071f6e0
perf 9888 [3] 20119.782098: kmem:kmem_cache_alloc: (jbd2__journal_start+0x72) call_site=ffffffffb9333b42 ptr=0xffff888bdf1a39c0 bytes_req=48 bytes_alloc=48 gfp_flags=GFP_NOFS|__GFP_ZERO
perf 9888 [3] 20119.782098: kmem:kmem_cache_free: (jbd2_journal_stop+0x1a1) call_site=ffffffffb9334581 ptr=0xffff888bdf1a39c0
perf 9888 [3] 20119.782099: kmem:kmem_cache_alloc: (jbd2__journal_start+0x72) call_site=ffffffffb9333b42 ptr=0xffff888bdf1a39c0 bytes_req=48 bytes_alloc=48 gfp_flags=GFP_NOFS|__GFP_ZERO
perf 9888 [3] 20119.782100: kmem:kmem_cache_alloc: (alloc_buffer_head+0x21) call_site=ffffffffb9287cc1 ptr=0xffff8889b12722d8 bytes_req=104 bytes_alloc=104 gfp_flags=GFP_NOFS|__GFP_ZERO
perf 9888 [3] 20119.782101: kmem:kmem_cache_free: (jbd2_journal_stop+0x1a1) call_site=ffffffffb9334581 ptr=0xffff888bdf1a39c0
perf 9888 [3] 20119.782102: kmem:kmem_cache_alloc: (jbd2__journal_start+0x72) call_site=ffffffffb9333b42 ptr=0xffff888bdf1a39c0 bytes_req=48 bytes_alloc=48 gfp_flags=GFP_NOFS|__GFP_ZERO
perf 9888 [3] 20119.782103: kmem:kmem_cache_free: (jbd2_journal_stop+0x1a1) call_site=ffffffffb9334581 ptr=0xffff888bdf1a39c0
#
# # stats for the whole perf.data file, i.e. no interval specified
#
# perf kmem stat
SUMMARY (SLAB allocator)
========================
Total bytes requested: 172,628
Total bytes allocated: 173,088
Total bytes freed: 161,280
Net total bytes allocated: 11,808
Total bytes wasted on internal fragmentation: 460
Internal fragmentation: 0.265761%
Cross CPU allocations: 0/851
#
# # stats for an end open interval, after a certain time:
#
# perf kmem stat --time 20119.782088,
SUMMARY (SLAB allocator)
========================
Total bytes requested: 552
Total bytes allocated: 552
Total bytes freed: 448
Net total bytes allocated: 104
Total bytes wasted on internal fragmentation: 0
Internal fragmentation: 0.000000%
Cross CPU allocations: 0/8
#
Signed-off-by: David Ahern <dsahern@gmail.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1480439746-42695-6-git-send-email-dsahern@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
74 lines
1.7 KiB
Plaintext
74 lines
1.7 KiB
Plaintext
perf-kmem(1)
|
|
============
|
|
|
|
NAME
|
|
----
|
|
perf-kmem - Tool to trace/measure kernel memory properties
|
|
|
|
SYNOPSIS
|
|
--------
|
|
[verse]
|
|
'perf kmem' {record|stat} [<options>]
|
|
|
|
DESCRIPTION
|
|
-----------
|
|
There are two variants of perf kmem:
|
|
|
|
'perf kmem record <command>' to record the kmem events
|
|
of an arbitrary workload.
|
|
|
|
'perf kmem stat' to report kernel memory statistics.
|
|
|
|
OPTIONS
|
|
-------
|
|
-i <file>::
|
|
--input=<file>::
|
|
Select the input file (default: perf.data unless stdin is a fifo)
|
|
|
|
-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)
|
|
|
|
--time::
|
|
Only analyze samples within given time window: <start>,<stop>. Times
|
|
have the format seconds.microseconds. If start is not given (i.e., time
|
|
string is ',x.y') then analysis starts at the beginning of the file. If
|
|
stop time is not given (i.e, time string is 'x.y,') then analysis goes
|
|
to end of file.
|
|
|
|
SEE ALSO
|
|
--------
|
|
linkperf:perf-record[1]
|