bionic (1) perf-buildid-cache.1.gz

NAME

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

SYNOPSIS

       perf buildid-cache <options>

DESCRIPTION

       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

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

       -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.

       -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) perf.data. 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.

       -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

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