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perf buildid-cache --add <binary> scans given binary and add
the SDT events to probe cache. "sdt_" prefix is appended for
all SDT providers to avoid event-name clash with other pre-defined
events. It is possible to use the cached SDT events as other cached
events, via perf probe --add "sdt_<provider>:<event>=<event>".
e.g.
----
# perf buildid-cache --add /lib/libc-2.17.so
# perf probe --cache --list | head -n 5
/usr/lib/libc-2.17.so (a6fb821bdf53660eb2c29f778757aef294d3d392):
sdt_libc:setjmp=setjmp
sdt_libc:longjmp=longjmp
sdt_libc:longjmp_target=longjmp_target
sdt_libc:memory_heap_new=memory_heap_new
# perf probe -x /usr/lib/libc-2.17.so \
-a sdt_libc:memory_heap_new=memory_heap_new
Added new event:
sdt_libc:memory_heap_new (on memory_heap_new
in /usr/lib/libc-2.17.so)
You can now use it in all perf tools, such as:
perf record -e sdt_libc:memory_heap_new -aR sleep 1
# perf probe -l
sdt_libc:memory_heap_new (on new_heap+183 in /usr/lib/libc-2.17.so)
----
Note that SDT event entries in probe-cache file is somewhat different
from normal cached events. Normal one starts with "#", but SDTs are
starting with "%".
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Hemant Kumar <hemant@linux.vnet.ibm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/146736025058.27797.13043265488541434502.stgit@devbox
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
67 lines
2.2 KiB
Plaintext
67 lines
2.2 KiB
Plaintext
perf-buildid-cache(1)
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=====================
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NAME
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----
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perf-buildid-cache - Manage build-id cache.
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SYNOPSIS
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--------
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[verse]
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'perf buildid-cache <options>'
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DESCRIPTION
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-----------
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This command manages the build-id cache. It can add, remove, update and purge
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files to/from the cache. In the future it should as well set upper limits for
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the space used by the cache, etc.
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This also scans the target binary for SDT (Statically Defined Tracing) and
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record it along with the buildid-cache, which will be used by perf-probe.
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For more details, see linkperf:perf-probe[1].
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OPTIONS
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-------
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-a::
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--add=::
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Add specified file to the cache.
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-k::
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--kcore::
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Add specified kcore file to the cache. For the current host that is
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/proc/kcore which requires root permissions to read. Be aware that
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running 'perf buildid-cache' as root may update root's build-id cache
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not the user's. Use the -v option to see where the file is created.
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Note that the copied file contains only code sections not the whole core
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image. Note also that files "kallsyms" and "modules" must also be in the
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same directory and are also copied. All 3 files are created with read
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permissions for root only. kcore will not be added if there is already a
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kcore in the cache (with the same build-id) that has the same modules at
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the same addresses. Use the -v option to see if a copy of kcore is
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actually made.
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-r::
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--remove=::
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Remove a cached binary which has same build-id of specified file
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from the cache.
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-p::
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--purge=::
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Purge all cached binaries including older caches which have specified
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path from the cache.
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-M::
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--missing=::
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List missing build ids in the cache for the specified file.
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-u::
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--update=::
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Update specified file of the cache. Note that this doesn't remove
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older entires since those may be still needed for annotating old
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(or remote) perf.data. Only if there is already a cache which has
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exactly same build-id, that is replaced by new one. It can be used
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to update kallsyms and kernel dso to vmlinux in order to support
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annotation.
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-v::
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--verbose::
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Be more verbose.
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SEE ALSO
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--------
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linkperf:perf-record[1], linkperf:perf-report[1], linkperf:perf-buildid-list[1]
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