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From: Jeff Hostetler <git@jeffhostetler.com>
To: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>,
	"Jeff Hostetler via GitGitGadget" <gitgitgadget@gmail.com>
Cc: git@vger.kernel.org, Jeff Hostetler <jeffhost@microsoft.com>
Subject: Re: [PATCH 7/9] trace2: add stopwatch timers
Date: Wed, 22 Dec 2021 16:38:52 -0500	[thread overview]
Message-ID: <9856c7aa-fe07-6164-d101-6d7d25c1ebbb@jeffhostetler.com> (raw)
In-Reply-To: <211220.86h7b3usnn.gmgdl@evledraar.gmail.com>



On 12/20/21 11:42 AM, Ævar Arnfjörð Bjarmason wrote:
> 
> On Mon, Dec 20 2021, Jeff Hostetler via GitGitGadget wrote:
> 
>> From: Jeff Hostetler <jeffhost@microsoft.com>
>> [...]
>> +
>> +void trace2_timer_stop(enum trace2_timer_id tid)
>> +{
>> +	if (!trace2_enabled)
>> +		return;
>> +
>> +	if (tid < 0 || tid >= TRACE2_NUMBER_OF_TIMERS)
>> +		BUG("invalid timer id: %d", tid);
> 
> nit / style: maybe assert() instead for cases where assert() produces
> better info than BUG(). I.e. it would quote the whole expression, and
> show you what condition it violated....

I'd rather leave it a BUG() so that we always get the
guard code.  assert() goes away in non-debug builds and
a little while later "tid" will be used as a subscript.

I'll add the function name to the BUG message to make
it a little clearer.


[...]
> 
> Perhaps more readable/easily understood as just a (untested):
> 
>      if (!t->interval_count || us_interval >= t->min_us)
> 	    t->min_us = us_interval;
>      if (!t->interval_count || us_interval >= t->max_us)
> 	    t->max_us = us_interval;
> 
> I.e. to avoid duplicating the identical assignment...
[...]

I'll look at something here to make this a little less
messy.  Probably add a MIN() and MAX() to the mixture.

> 
>> +	/*
>> +	 * Number of nested starts on the stack in this thread.  (We
>> +	 * ignore recursive starts and use this to track the recursive
>> +	 * calls.)
>> +	 */
>> +	unsigned int recursion_count;
> 
> Earlier we have various forms of:
> 
>      if (t->recursion_count > 1)
> 
> But since it's unsigned can we just make those a:
> 
>      if (t->recursion_count)
> 

The places that are > 0, yes.  But the > 1 instances
are different since we're counting how many calls are
on the stack and want to handle recursive calls differently
than the first.


  reply	other threads:[~2021-12-22 21:38 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-20 15:01 [PATCH 0/9] Trace2 stopwatch timers and global counters Jeff Hostetler via GitGitGadget
2021-12-20 15:01 ` [PATCH 1/9] trace2: use size_t alloc,nr_open_regions in tr2tls_thread_ctx Jeff Hostetler via GitGitGadget
2021-12-20 15:01 ` [PATCH 2/9] trace2: convert tr2tls_thread_ctx.thread_name from strbuf to char* Jeff Hostetler via GitGitGadget
2021-12-20 16:31   ` Ævar Arnfjörð Bjarmason
2021-12-20 19:07     ` Jeff Hostetler
2021-12-20 19:35       ` Ævar Arnfjörð Bjarmason
2021-12-22 16:32         ` Jeff Hostetler
2021-12-21  7:33     ` Junio C Hamano
2021-12-21  7:22   ` Junio C Hamano
2021-12-22 16:28     ` Jeff Hostetler
2021-12-22 19:57       ` Junio C Hamano
2021-12-20 15:01 ` [PATCH 3/9] trace2: defer free of TLS CTX until program exit Jeff Hostetler via GitGitGadget
2021-12-21  7:30   ` Junio C Hamano
2021-12-22 21:59     ` Jeff Hostetler
2021-12-22 22:56       ` Junio C Hamano
2021-12-22 23:04         ` Jeff Hostetler
2021-12-23  7:38         ` Johannes Sixt
2021-12-23 18:18           ` Junio C Hamano
2021-12-27 18:51             ` Jeff Hostetler
2021-12-20 15:01 ` [PATCH 4/9] trace2: add thread-name override to event target Jeff Hostetler via GitGitGadget
2021-12-20 15:01 ` [PATCH 5/9] trace2: add thread-name override to perf target Jeff Hostetler via GitGitGadget
2021-12-20 15:01 ` [PATCH 6/9] trace2: add timer events to perf and event target formats Jeff Hostetler via GitGitGadget
2021-12-20 16:39   ` Ævar Arnfjörð Bjarmason
2021-12-20 19:44     ` Jeff Hostetler
2021-12-21 14:20   ` Derrick Stolee
2021-12-20 15:01 ` [PATCH 7/9] trace2: add stopwatch timers Jeff Hostetler via GitGitGadget
2021-12-20 16:42   ` Ævar Arnfjörð Bjarmason
2021-12-22 21:38     ` Jeff Hostetler [this message]
2021-12-21 14:45   ` Derrick Stolee
2021-12-22 21:57     ` Jeff Hostetler
2021-12-20 15:01 ` [PATCH 8/9] trace2: add counter events to perf and event target formats Jeff Hostetler via GitGitGadget
2021-12-20 16:51   ` Ævar Arnfjörð Bjarmason
2021-12-22 22:56     ` Jeff Hostetler
2021-12-20 15:01 ` [PATCH 9/9] trace2: add global counters Jeff Hostetler via GitGitGadget
2021-12-20 17:14   ` Ævar Arnfjörð Bjarmason
2021-12-22 22:18     ` Jeff Hostetler
2021-12-21 14:51 ` [PATCH 0/9] Trace2 stopwatch timers and " Derrick Stolee
2021-12-21 23:27   ` Matheus Tavares
2021-12-28 19:36 ` [PATCH v2 " Jeff Hostetler via GitGitGadget
2021-12-28 19:36   ` [PATCH v2 1/9] trace2: use size_t alloc,nr_open_regions in tr2tls_thread_ctx Jeff Hostetler via GitGitGadget
2021-12-29  0:48     ` Ævar Arnfjörð Bjarmason
2021-12-28 19:36   ` [PATCH v2 2/9] trace2: convert tr2tls_thread_ctx.thread_name from strbuf to flex array Jeff Hostetler via GitGitGadget
2021-12-29  1:11     ` Ævar Arnfjörð Bjarmason
2021-12-29 16:46       ` Jeff Hostetler
2021-12-28 19:36   ` [PATCH v2 3/9] trace2: defer free of thread local storage until program exit Jeff Hostetler via GitGitGadget
2021-12-28 19:36   ` [PATCH v2 4/9] trace2: add thread-name override to event target Jeff Hostetler via GitGitGadget
2021-12-28 19:36   ` [PATCH v2 5/9] trace2: add thread-name override to perf target Jeff Hostetler via GitGitGadget
2021-12-29  1:48     ` Ævar Arnfjörð Bjarmason
2021-12-29 17:15       ` Jeff Hostetler
2021-12-28 19:36   ` [PATCH v2 6/9] trace2: add timer events to perf and event target formats Jeff Hostetler via GitGitGadget
2021-12-28 19:36   ` [PATCH v2 7/9] trace2: add stopwatch timers Jeff Hostetler via GitGitGadget
2021-12-28 19:36   ` [PATCH v2 8/9] trace2: add counter events to perf and event target formats Jeff Hostetler via GitGitGadget
2021-12-28 19:36   ` [PATCH v2 9/9] trace2: add global counters Jeff Hostetler via GitGitGadget
2021-12-29  1:54   ` [PATCH v2 0/9] Trace2 stopwatch timers and " Ævar Arnfjörð Bjarmason
2021-12-30 16:42     ` Jeff Hostetler

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