The following commit has been merged into the perf/urgent branch of tip: Commit-ID: 9974406884459c9301597c2c9f7def6c38099ab4 Gitweb: https://git.kernel.org/tip/9974406884459c9301597c2c9f7def6c38099ab4 Author: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> AuthorDate: Mon, 02 Dec 2019 15:38:59 -03:00 Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> CommitterDate: Mon, 02 Dec 2019 15:38:59 -03:00 perf kvm: Clarify the 'perf kvm' -i and -o command line options The 'perf kvm' subcommand has options that it in turn passes to other perf subcommands such as 'report' and 'record', particularly -i and -o end up setting the same variable that will then be used for 'record's -o and report '-i', which ends up being confusing, leading some to think that both -i and -o can be used with 'report'. Improve the man page to state that -i is used with the post-processing subcommands while -o is used just with 'record' and that to save the output of 'report' one should simply redirect its output to a file. Noticed while reading the https://www.linux-kvm.org/page/Perf_events page. Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx> Cc: Jiri Olsa <jolsa@xxxxxxxxxx> Cc: Namhyung Kim <namhyung@xxxxxxxxxx> Cc: Steve Dickson <steved@xxxxxxxxxx> Cc: William Cohen <wcohen@xxxxxxxxxx> Link: https://lkml.kernel.org/n/tip-tclbttvmgtm525fvmh85f7d9@xxxxxxxxxxxxxx Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> --- tools/perf/Documentation/perf-kvm.txt | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/tools/perf/Documentation/perf-kvm.txt b/tools/perf/Documentation/perf-kvm.txt index 6a5bb2b..cf95bae 100644 --- a/tools/perf/Documentation/perf-kvm.txt +++ b/tools/perf/Documentation/perf-kvm.txt @@ -68,10 +68,11 @@ OPTIONS ------- -i:: --input=<path>:: - Input file name. + Input file name, for the 'report', 'diff' and 'buildid-list' subcommands. -o:: --output=<path>:: - Output file name. + Output file name, for the 'record' subcommand. Doesn't work with 'report', + just redirect the output to a file when using 'report'. --host:: Collect host side performance profile. --guest::
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