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_4.14-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_4.14-record(1), perf_4.14-report(1),
perf_4.14-buildid-list(1)
