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Fedora 35 sets DEBUGINFOD_URLS by default, which might lead to unexpected stalls in perf record exit path, when we try to cache profiled binaries. # DEBUGINFOD_PROGRESS=1 ./perf record -a ^C[ perf record: Woken up 1 times to write data ] Downloading from https://debuginfod.fedoraproject.org/ 447069 Downloading from https://debuginfod.fedoraproject.org/ 1502175 Downloading \^Z Disabling DEBUGINFOD_URLS by default in perf record and adding debuginfod option and .perfconfig variable support to enable id. Default without debuginfo processing: # perf record -a Using system debuginfod setup: # perf record -a --debuginfod Using custom debuginfd url: # perf record -a --debuginfod='https://evenbetterdebuginfodserver.krava' Adding single perf_debuginfod_setup function and using it also in perf buildid-cache command. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Frank Ch. Eigler <fche@redhat.com> Cc: Ian Rogers <irogers@google.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Michael Petlan <mpetlan@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lore.kernel.org/lkml/20211209200425.303561-1-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
89 lines
2.9 KiB
Plaintext
89 lines
2.9 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 entries 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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--debuginfod[=URLs]::
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Specify debuginfod URL to be used when retrieving perf.data binaries,
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it follows the same syntax as the DEBUGINFOD_URLS variable, like:
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buildid-cache.debuginfod=http://192.168.122.174:8002
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If the URLs is not specified, the value of DEBUGINFOD_URLS
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system environment variable is used.
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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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