perf-buildid-cache(1) — Linux manual page


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

NAME         top

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

SYNOPSIS         top

       perf buildid-cache <options>

DESCRIPTION         top

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

OPTIONS         top

       -a, --add=
           Add specified file to the cache.

       -f, --force
           Don’t complain, do it.

       -k, --kcore
           Add specified kcore file to the cache. For the current host that
           is /proc/kcore which requires root permissions to read. Be aware
           that running perf buildid-cache as root may update root’s
           build-id cache not the user’s. Use the -v option to see where the
           file is created. Note that the copied file contains only code
           sections not the whole core image. Note also that files
           "kallsyms" and "modules" must also be in the same directory and
           are also copied. All 3 files are created with read permissions
           for root only. kcore will not be added if there is already a
           kcore in the cache (with the same build-id) that has the same
           modules at the same addresses. Use the -v option to see if a copy
           of kcore is actually made.

       -r, --remove=
           Remove a cached binary which has same build-id of specified file
           from the cache.

       -p, --purge=
           Purge all cached binaries including older caches which have
           specified path from the cache.

       -P, --purge-all
           Purge all cached binaries. This will flush out entire cache.

       -M, --missing=
           List missing build ids in the cache for the specified file.

       -u, --update=
           Update specified file of the cache. Note that this doesn’t remove
           older entires since those may be still needed for annotating old
           (or remote) Only if there is already a cache which has
           exactly same build-id, that is replaced by new one. It can be
           used to update kallsyms and kernel dso to vmlinux in order to
           support annotation.

       -l, --list
           List all valid binaries from cache.

       -v, --verbose
           Be more verbose.

       --target-ns=PID: Obtain mount namespace information from the target
       pid. This is used when creating a uprobe for a process that resides
       in a different mount namespace from the perf(1) utility.

SEE ALSO         top

       perf-record(1), perf-report(1), perf-buildid-list(1)

COLOPHON         top

       This page is part of the perf (Performance analysis tools for Linux
       (in Linux source tree)) project.  Information about the project can
       be found at ⟨⟩.  If
       you have a bug report for this manual page, send it to  This page was obtained from the
       project's upstream Git repository
       ⟨⟩ on
       2020-08-13.  (At that time, the date of the most recent commit that
       was found in the repository was 2020-08-12.)  If you discover any
       rendering problems in this HTML version of the page, or you believe
       there is a better or more up-to-date source for the page, or you have
       corrections or improvements to the information in this COLOPHON
       (which is not part of the original manual page), send a mail to

perf                             2018-04-26            PERF-BUILDID-CACHE(1)

Pages that refer to this page: perf-probe(1)