1PERF-BUILDID-CACHE(1)             perf Manual            PERF-BUILDID-CACHE(1)
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NAME

6       perf-buildid-cache - Manage build-id cache.
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SYNOPSIS

9       perf buildid-cache <options>
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DESCRIPTION

12       This command manages the build-id cache. It can add, remove, update and
13       purge files to/from the cache. In the future it should as well set
14       upper limits for the space used by the cache, etc. This also scans the
15       target binary for SDT (Statically Defined Tracing) and record it along
16       with the buildid-cache, which will be used by perf-probe. For more
17       details, see perf-probe(1).
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OPTIONS

20       -a, --add=
21           Add specified file to the cache.
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23       -f, --force
24           Don’t complain, do it.
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26       -k, --kcore
27           Add specified kcore file to the cache. For the current host that is
28           /proc/kcore which requires root permissions to read. Be aware that
29           running perf buildid-cache as root may update root’s build-id cache
30           not the user’s. Use the -v option to see where the file is created.
31           Note that the copied file contains only code sections not the whole
32           core image. Note also that files "kallsyms" and "modules" must also
33           be in the same directory and are also copied. All 3 files are
34           created with read permissions for root only. kcore will not be
35           added if there is already a kcore in the cache (with the same
36           build-id) that has the same modules at the same addresses. Use the
37           -v option to see if a copy of kcore is actually made.
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39       -r, --remove=
40           Remove a cached binary which has same build-id of specified file
41           from the cache.
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43       -p, --purge=
44           Purge all cached binaries including older caches which have
45           specified path from the cache.
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47       -P, --purge-all
48           Purge all cached binaries. This will flush out entire cache.
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50       -M, --missing=
51           List missing build ids in the cache for the specified file.
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53       -u, --update=
54           Update specified file of the cache. Note that this doesn’t remove
55           older entries since those may be still needed for annotating old
56           (or remote) perf.data. Only if there is already a cache which has
57           exactly same build-id, that is replaced by new one. It can be used
58           to update kallsyms and kernel dso to vmlinux in order to support
59           annotation.
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61       -l, --list
62           List all valid binaries from cache.
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64       -v, --verbose
65           Be more verbose.
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67       --target-ns=PID: Obtain mount namespace information from the target
68       pid. This is used when creating a uprobe for a process that resides in
69       a different mount namespace from the perf(1) utility.
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71       --debuginfod[=URLs]
72           Specify debuginfod URL to be used when retrieving perf.data
73           binaries, it follows the same syntax as the DEBUGINFOD_URLS
74           variable, like:
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76               buildid-cache.debuginfod=http://192.168.122.174:8002
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78               If the URLs is not specified, the value of DEBUGINFOD_URLS
79               system environment variable is used.
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SEE ALSO

82       perf-record(1), perf-report(1), perf-buildid-list(1)
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86perf                              06/14/2022             PERF-BUILDID-CACHE(1)
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