From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
Arnaldo Carvalho de Melo <acme@redhat.com>,
Adrian Hunter <adrian.hunter@intel.com>,
David Ahern <dsahern@gmail.com>, Jiri Olsa <jolsa@kernel.org>,
Namhyung Kim <namhyung@kernel.org>,
Wang Nan <wangnan0@huawei.com>
Subject: [PATCH 11/28] perf top: Allow asking for the maximum allowed sample rate
Date: Mon, 5 Mar 2018 11:29:15 -0300 [thread overview]
Message-ID: <20180305142932.16921-12-acme@kernel.org> (raw)
In-Reply-To: <20180305142932.16921-1-acme@kernel.org>
From: Arnaldo Carvalho de Melo <acme@redhat.com>
Add the handy '-F max' shortcut, just introduced to 'perf record', to
reading and using the kernel.perf_event_max_sample_rate value as the
user supplied sampling frequency:
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-hz04f296zccknnb5at06a6q0@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/Documentation/perf-top.txt | 4 +++-
tools/perf/builtin-top.c | 4 +++-
2 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/tools/perf/Documentation/perf-top.txt b/tools/perf/Documentation/perf-top.txt
index 8a32cc77bead..a039407d63b8 100644
--- a/tools/perf/Documentation/perf-top.txt
+++ b/tools/perf/Documentation/perf-top.txt
@@ -55,7 +55,9 @@ Default is to monitor all CPUS.
-F <freq>::
--freq=<freq>::
- Profile at this frequency.
+ Profile at this frequency. Use 'max' to use the currently maximum
+ allowed frequency, i.e. the value in the kernel.perf_event_max_sample_rate
+ sysctl.
-i::
--inherit::
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 35ac016fcb98..bb4f9fafd11d 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -1307,7 +1307,9 @@ int cmd_top(int argc, const char **argv)
OPT_STRING(0, "sym-annotate", &top.sym_filter, "symbol name",
"symbol to annotate"),
OPT_BOOLEAN('z', "zero", &top.zero, "zero history across updates"),
- OPT_UINTEGER('F', "freq", &opts->user_freq, "profile at this frequency"),
+ OPT_CALLBACK('F', "freq", &top.record_opts, "freq or 'max'",
+ "profile at this frequency",
+ record__parse_freq),
OPT_INTEGER('E', "entries", &top.print_entries,
"display this many functions"),
OPT_BOOLEAN('U', "hide_user_symbols", &top.hide_user_symbols,
--
2.14.3
next prev parent reply other threads:[~2018-03-05 14:29 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-05 14:29 [GIT PULL 00/28] perf/core improvements and fixes Arnaldo Carvalho de Melo
2018-03-05 14:29 ` [PATCH 01/28] perf kallsyms: Fix the usage on the man page Arnaldo Carvalho de Melo
2018-03-05 14:29 ` [PATCH 02/28] perf stat: Use xyarray dimensions to iterate fds Arnaldo Carvalho de Melo
2018-03-05 14:29 ` [PATCH 03/28] perf cgroup: Simplify arguments when tracking multiple events Arnaldo Carvalho de Melo
2018-03-05 14:29 ` [PATCH 04/28] perf top: Fix annoying fallback message on older kernels Arnaldo Carvalho de Melo
2018-03-05 14:29 ` [PATCH 05/28] perf stat: Ignore error thread when enabling system-wide --per-thread Arnaldo Carvalho de Melo
2018-03-05 14:29 ` [PATCH 06/28] perf annotate browser: Be more robust when drawing jump arrows Arnaldo Carvalho de Melo
2018-03-05 14:29 ` [PATCH 07/28] perf tests: Switch trace+probe_libc_inet_pton to use record Arnaldo Carvalho de Melo
2018-03-05 14:29 ` [PATCH 08/28] perf tests: Rename trace+probe_libc_inet_pton to record+probe_libc_inet_pton Arnaldo Carvalho de Melo
2018-03-05 14:29 ` [PATCH 09/28] perf record: Allow asking for the maximum allowed sample rate Arnaldo Carvalho de Melo
2018-03-05 14:29 ` [PATCH 10/28] perf top browser: Show sample_freq in browser title line Arnaldo Carvalho de Melo
2018-03-05 14:29 ` Arnaldo Carvalho de Melo [this message]
2018-03-05 14:29 ` [PATCH 12/28] perf record: Throttle user defined frequencies to the maximum allowed Arnaldo Carvalho de Melo
2018-03-05 14:29 ` [PATCH 13/28] perf annotate: Find 'call' instruction target symbol at parsing time Arnaldo Carvalho de Melo
2018-03-05 14:29 ` [PATCH 14/28] perf record: Fix crash in pipe mode Arnaldo Carvalho de Melo
2018-03-05 14:29 ` [PATCH 15/28] perf kvm: Switch to new perf_mmap__read_event() interface Arnaldo Carvalho de Melo
2018-03-05 14:29 ` [PATCH 16/28] perf trace: " Arnaldo Carvalho de Melo
2018-03-05 14:29 ` [PATCH 17/28] perf python: " Arnaldo Carvalho de Melo
2018-03-05 14:29 ` [PATCH 18/28] perf test: Switch to new perf_mmap__read_event() interface for bpf Arnaldo Carvalho de Melo
2018-03-05 14:29 ` [PATCH 19/28] perf test: Switch to new perf_mmap__read_event() interface for 'code reading' test Arnaldo Carvalho de Melo
2018-03-05 14:29 ` [PATCH 20/28] perf test: Switch to new perf_mmap__read_event() interface for "keep tracking" test Arnaldo Carvalho de Melo
2018-03-05 14:29 ` [PATCH 21/28] perf test: Switch to new perf_mmap__read_event() interface for mmap-basic Arnaldo Carvalho de Melo
2018-03-05 14:29 ` [PATCH 22/28] perf test: Switch to new perf_mmap__read_event() interface for tp fields Arnaldo Carvalho de Melo
2018-03-05 14:29 ` [PATCH 23/28] perf test: Switch to new perf_mmap__read_event() interface for perf-record Arnaldo Carvalho de Melo
2018-03-05 14:29 ` [PATCH 24/28] perf test: Switch to new perf_mmap__read_event() interface for time-to-tsc Arnaldo Carvalho de Melo
2018-03-05 14:29 ` [PATCH 25/28] perf test: Switch to new perf_mmap__read_event() interface for sw-clock Arnaldo Carvalho de Melo
2018-03-05 14:29 ` [PATCH 26/28] perf test: Switch to new perf_mmap__read_event() interface for switch-tracking Arnaldo Carvalho de Melo
2018-03-05 14:29 ` [PATCH 27/28] perf test: Switch to new perf_mmap__read_event() interface for task-exit Arnaldo Carvalho de Melo
2018-03-05 14:29 ` [PATCH 28/28] perf mmap: Discard legacy interfaces for mmap read forward Arnaldo Carvalho de Melo
2018-03-06 6:35 ` [GIT PULL 00/28] perf/core improvements and fixes Ingo Molnar
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