From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7964D1E515; Mon, 9 Dec 2024 22:42:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733784120; cv=none; b=f5pE6bqYzIKDqU7n4SPHwW8PskL4nlR9BagIe9oENeuZirdA2Ih7pf7Sj4+U4wrnDKPVgyTdZcLdaVfdgCX5OzVhWgUHrw7G/csySrG/rWL54BCjDHl3q5DfvbOWJxYUItgUtYhFHrumdVhQsDEVoW7aGs3TYF6dkQxqDdSpmWA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733784120; c=relaxed/simple; bh=iFRvvWU6QYulZIvePgrcE3oP3TgpLKs1XopIPM70r4A=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=COqYZHUGNF9XHleodGq2iTs3CAxJc+g3oIYNA4XoQ8gQbonmSVhgYCVzP+tE75G7JP8OQhZ9ltTrMo0nzRuWzH9nXwfwLFGZQEfVbG971HNwPdlV8kJyC/5UoCx0QwZfLrpJDrL+ugjhySEQaDmqhtqgdAcJHk+FvUWxgcXk1nY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=nBNlzMVV; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="nBNlzMVV" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7F417C4CEDD; Mon, 9 Dec 2024 22:41:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1733784120; bh=iFRvvWU6QYulZIvePgrcE3oP3TgpLKs1XopIPM70r4A=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=nBNlzMVVOIoUj4jLgf04fEXR1GapEfmcdo/udKXGx88Zq6mZ/VczgqxcV41f9mRNc jHcoDU8tEHHzLQz+sIHdrPoXGg0BlVPa+Eumwrz52VuWso7tyn13ypPebUNeFFikGc yOnGkWMZn61FlNpWqG/1v9xQnfYZdzTpSwtGUBPQN8elEt1n/cUpEIiiryw1Y7rA/w 5HAt8f4hgqww+X9HLn3tMtrb70IyyL7MeKdpsdwiN4KCoepK+jeXDcDt2XOwlvl3RI vDZgQ6F1q8OAiOODGhl5o5VRln61/45HBOb9f8aba6n9PPiljd2qlnqk+wbdl5mpCq HSsB0SJoYuCRw== Date: Mon, 9 Dec 2024 14:41:58 -0800 From: Namhyung Kim To: Chun-Tse Shao Cc: linux-kernel@vger.kernel.org, peterz@infradead.org, mingo@redhat.com, acme@kernel.org, mark.rutland@arm.com, alexander.shishkin@linux.intel.com, jolsa@kernel.org, irogers@google.com, adrian.hunter@intel.com, kan.liang@linux.intel.com, linux-perf-users@vger.kernel.org Subject: Re: [PATCH v4 1/3] perf lock: Fix parse_lock_type which only retrieve one lock flag Message-ID: References: <20241209200104.870531-1-ctshao@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20241209200104.870531-1-ctshao@google.com> On Mon, Dec 09, 2024 at 12:01:00PM -0800, Chun-Tse Shao wrote: > `parse_lock_type` can only add the first lock flag in `lock_type_table` > given input `str`. For example, for `Y rwlock`, it only adds `rwlock:R` > into this perf session. Another example is for `-Y mutex`, it only adds > the mutex without `LCB_F_SPIN` flag. The patch fixes this issue, makes > sure both `rwlock:R` and `rwlock:W` will be added with `-Y rwlock`, and > so on. > > Testing: > $ ./perf lock con -ab -Y mutex,rwlock -- perf bench sched pipe > # Running 'sched/pipe' benchmark: > # Executed 1000000 pipe operations between two processes > > Total time: 9.313 [sec] > > 9.313976 usecs/op > 107365 ops/sec > contended total wait max wait avg wait type caller > > 176 1.65 ms 19.43 us 9.38 us mutex pipe_read+0x57 > 34 180.14 us 10.93 us 5.30 us mutex pipe_write+0x50 > 7 77.48 us 16.09 us 11.07 us mutex do_epoll_wait+0x24d > 7 74.70 us 13.50 us 10.67 us mutex do_epoll_wait+0x24d > 3 35.97 us 14.44 us 11.99 us rwlock:W ep_done_scan+0x2d > 3 35.00 us 12.23 us 11.66 us rwlock:W do_epoll_wait+0x255 > 2 15.88 us 11.96 us 7.94 us rwlock:W do_epoll_wait+0x47c > 1 15.23 us 15.23 us 15.23 us rwlock:W do_epoll_wait+0x4d0 > 1 14.26 us 14.26 us 14.26 us rwlock:W ep_done_scan+0x2d > 2 14.00 us 7.99 us 7.00 us mutex pipe_read+0x282 > 1 12.29 us 12.29 us 12.29 us rwlock:R ep_poll_callback+0x35 > 1 12.02 us 12.02 us 12.02 us rwlock:W do_epoll_ctl+0xb65 > 1 10.25 us 10.25 us 10.25 us rwlock:R ep_poll_callback+0x35 > 1 7.86 us 7.86 us 7.86 us mutex do_epoll_ctl+0x6c1 > 1 5.04 us 5.04 us 5.04 us mutex do_epoll_ctl+0x3d4 > > Fixes: d783ea8f62c4 ("perf lock contention: Simplify parse_lock_type()") > Signed-off-by: Chun-Tse Shao Reviewed-by: Namhyung Kim Thanks, Namhyung > --- > tools/perf/builtin-lock.c | 64 ++++++++++++++++++++++++--------------- > 1 file changed, 39 insertions(+), 25 deletions(-) > > diff --git a/tools/perf/builtin-lock.c b/tools/perf/builtin-lock.c > index 062e2b56a2ab..7e36bbe3cb80 100644 > --- a/tools/perf/builtin-lock.c > +++ b/tools/perf/builtin-lock.c > @@ -1591,8 +1591,6 @@ static const struct { > { LCB_F_PERCPU | LCB_F_WRITE, "pcpu-sem:W", "percpu-rwsem" }, > { LCB_F_MUTEX, "mutex", "mutex" }, > { LCB_F_MUTEX | LCB_F_SPIN, "mutex", "mutex" }, > - /* alias for get_type_flag() */ > - { LCB_F_MUTEX | LCB_F_SPIN, "mutex-spin", "mutex" }, > }; > > static const char *get_type_str(unsigned int flags) > @@ -1617,19 +1615,6 @@ static const char *get_type_name(unsigned int flags) > return "unknown"; > } > > -static unsigned int get_type_flag(const char *str) > -{ > - for (unsigned int i = 0; i < ARRAY_SIZE(lock_type_table); i++) { > - if (!strcmp(lock_type_table[i].name, str)) > - return lock_type_table[i].flags; > - } > - for (unsigned int i = 0; i < ARRAY_SIZE(lock_type_table); i++) { > - if (!strcmp(lock_type_table[i].str, str)) > - return lock_type_table[i].flags; > - } > - return UINT_MAX; > -} > - > static void lock_filter_finish(void) > { > zfree(&filters.types); > @@ -2350,29 +2335,58 @@ static int parse_lock_type(const struct option *opt __maybe_unused, const char * > int unset __maybe_unused) > { > char *s, *tmp, *tok; > - int ret = 0; > > s = strdup(str); > if (s == NULL) > return -1; > > for (tok = strtok_r(s, ", ", &tmp); tok; tok = strtok_r(NULL, ", ", &tmp)) { > - unsigned int flags = get_type_flag(tok); > + bool found = false; > > - if (flags == -1U) { > - pr_err("Unknown lock flags: %s\n", tok); > - ret = -1; > - break; > + /* `tok` is `str` in `lock_type_table` if it contains ':'. */ > + if (strchr(tok, ':')) { > + for (unsigned int i = 0; i < ARRAY_SIZE(lock_type_table); i++) { > + if (!strcmp(lock_type_table[i].str, tok) && > + add_lock_type(lock_type_table[i].flags)) { > + found = true; > + break; > + } > + } > + > + if (!found) { > + pr_err("Unknown lock flags name: %s\n", tok); > + free(s); > + return -1; > + } > + > + continue; > } > > - if (!add_lock_type(flags)) { > - ret = -1; > - break; > + /* > + * Otherwise `tok` is `name` in `lock_type_table`. > + * Single lock name could contain multiple flags. > + */ > + for (unsigned int i = 0; i < ARRAY_SIZE(lock_type_table); i++) { > + if (!strcmp(lock_type_table[i].name, tok)) { > + if (add_lock_type(lock_type_table[i].flags)) { > + found = true; > + } else { > + free(s); > + return -1; > + } > + } > } > + > + if (!found) { > + pr_err("Unknown lock name: %s\n", tok); > + free(s); > + return -1; > + } > + > } > > free(s); > - return ret; > + return 0; > } > > static bool add_lock_addr(unsigned long addr) > -- > 2.47.0.338.g60cca15819-goog >