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9a73c30854
User can remove files from cache using --remove/--purge options but both
needs list of files as an argument. It's not convenient when you want to
flush out entire cache. Add an option to purge all files from cache.
Ex,
# perf buildid-cache -l
8a86ef73e44067bca52cc3f6cd3e5446c783391c /tmp/a.out
ebe71fdcf4b366518cc154d570a33cd461a51c36 /tmp/a.out.1
# perf buildid-cache -P -v
Removing /tmp/a.out (8a86ef73e44067bca52cc3f6cd3e5446c783391c): Ok
Removing /tmp/a.out.1 (ebe71fdcf4b366518cc154d570a33cd461a51c36): Ok
Purged all: Ok
Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Kate Stewart <kstewart@linuxfoundation.org>
Cc: Krister Johansen <kjlx@templeofstupid.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Philippe Ombredanne <pombredanne@nexb.com>
Cc: Sihyeon Jang <uneedsihyeon@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20180417041346.5617-4-ravi.bangoria@linux.vnet.ibm.com
[ Initialize 'err' in build_id_cache__purge_all(), to fix build on debian:7, as it can be used uninitialized ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
80 lines
2.6 KiB
Plaintext
80 lines
2.6 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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-f::
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--force::
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Don't complain, do it.
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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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-P::
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--purge-all::
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Purge all cached binaries. This will flush out entire 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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-l::
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--list::
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List all valid binaries from cache.
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-v::
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--verbose::
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Be more verbose.
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--target-ns=PID:
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Obtain mount namespace information from the target pid. This is
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used when creating a uprobe for a process that resides in a
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different mount namespace from the perf(1) utility.
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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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