On Mon, Apr 06, 2020 at 11:40:18PM -0700, Ian Rogers wrote: > From: Stephane Eranian <eranian@xxxxxxxxxx> > > This patch links perf with the libpfm4 library if it is available and > NO_LIBPFM4 isn't passed to the build. The libpfm4 library contains hardware > event tables for all processors supported by perf_events. It is a helper > library that helps convert from a symbolic event name to the event > encoding required by the underlying kernel interface. This > library is open-source and available from: http://perfmon2.sf.net. > > With this patch, it is possible to specify full hardware events > by name. Hardware filters are also supported. Events must be > specified via the --pfm-events and not -e option. Both options > are active at the same time and it is possible to mix and match: > > $ perf stat --pfm-events inst_retired:any_p:c=1:i -e cycles .... > > v7 rebases and adds fallback code for libpfm4 events. > The fallback code is to force user only priv level in case the > perf_event_open() syscall failed for permissions reason. > the fallback forces a user privilege level restriction on the event string, > so depending on the syntax either u or :u is needed. > > But libpfm4 can use a : or . as the separator, so simply searching > for ':' vs. '/' is not good enough to determine the syntax needed. > Therefore, this patch introduces a new evsel boolean field to mark events > coming from libpfm4. The field is then used to adjust the fallback string. heya, I made bunch of comments for v5, not sure you saw them: https://lore.kernel.org/lkml/20200323235846.104937-1-irogers@xxxxxxxxxx/ jirka > v6 is a rebase. > v5 is a rebase. > v4 is a rebase on git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git > branch perf/core and re-adds the tools/build/feature/test-libpfm4.c > missed in v3. > v3 is against acme/perf/core and removes a diagnostic warning. > v2 of this patch makes the --pfm-events man page documentation > conditional on libpfm4 behing configured. It tidies some of the > documentation and adds the feature test missed in the v1 patch. > SNIP
