File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/tools/perf/Documentation/perf-buildid-cache.txt b/tools/perf/Documentation/perf-buildid-cache.txt
new file mode 100644
index 0000000..dd07b55
--- /dev/null
+++ b/tools/perf/Documentation/perf-buildid-cache.txt
@@ -0,0 +1,63 @@
+perf-buildid-cache(1)
+=====================
+
+NAME
+----
+perf-buildid-cache - Manage build-id cache.
+
+SYNOPSIS
+--------
+[verse]
+'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.
+
+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.
+
+SEE ALSO
+--------
+linkperf:perf-record[1], linkperf:perf-report[1], linkperf:perf-buildid-list[1]