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From: Junio C Hamano <gitster@pobox.com>
To: "Elijah Newren via GitGitGadget" <gitgitgadget@gmail.com>
Cc: git@vger.kernel.org, Eric Sunshine <sunshine@sunshineco.com>,
	Elijah Newren <newren@gmail.com>,
	Derrick Stolee <stolee@gmail.com>, Jeff King <peff@peff.net>,
	Philip Oakley <philipoakley@iee.email>,
	Jeff Hostetler <jeffhost@microsoft.com>,
	Josh Steadmon <steadmon@google.com>
Subject: Re: [PATCH v3 1/8] [RFC] dir: convert trace calls to trace2 equivalents
Date: Mon, 10 May 2021 13:49:35 +0900	[thread overview]
Message-ID: <xmqqk0o7ry5c.fsf@gitster.g> (raw)
In-Reply-To: <9f1c0d78d739cc1da8517eea92e81a7bd162578f.1620503945.git.gitgitgadget@gmail.com> (Elijah Newren via GitGitGadget's message of "Sat, 08 May 2021 19:58:57 +0000")

"Elijah Newren via GitGitGadget" <gitgitgadget@gmail.com> writes:

> +static void trace2_read_directory_statistics(struct dir_struct *dir,
> +					     struct repository *repo)
> +{
> +	if (!dir->untracked)
> +		return;
> +	trace2_data_intmax("read_directory", repo,
> +			   "node-creation", dir->untracked->dir_created);
> +	trace2_data_intmax("read_directory", repo,
> +			   "gitignore-invalidation",
> +			   dir->untracked->gitignore_invalidated);
> +	trace2_data_intmax("read_directory", repo,
> +			   "directory-invalidation",
> +			   dir->untracked->dir_invalidated);
> +	trace2_data_intmax("read_directory", repo,
> +			   "opendir", dir->untracked->dir_opened);
> +}
> +

This obviously looks like an equivalent to what happens in the
original inside the "if (dir->untracked)" block.

And we have a performance_{enter,leave} pair replaced with
a region_[enter,leave} pair. 

> -	trace_performance_enter();
> +	trace2_region_enter("dir", "read_directory", istate->repo);
>   ...
> -	trace_performance_leave("read directory %.*s", len, path);
> +	trace2_region_leave("dir", "read_directory", istate->repo);

>  	if (dir->untracked) {
>  		static int force_untracked_cache = -1;
> -		static struct trace_key trace_untracked_stats = TRACE_KEY_INIT(UNTRACKED_STATS);
>  
>  		if (force_untracked_cache < 0)
>  			force_untracked_cache =
>  				git_env_bool("GIT_FORCE_UNTRACKED_CACHE", 0);
> -		trace_printf_key(&trace_untracked_stats,
> -				 "node creation: %u\n"
> -				 "gitignore invalidation: %u\n"
> -				 "directory invalidation: %u\n"
> -				 "opendir: %u\n",
> -				 dir->untracked->dir_created,
> -				 dir->untracked->gitignore_invalidated,
> -				 dir->untracked->dir_invalidated,
> -				 dir->untracked->dir_opened);
>  		if (force_untracked_cache &&
>  			dir->untracked == istate->untracked &&
>  		    (dir->untracked->dir_opened ||

Removal of the trace_printf() in the middle made the body of this
if() statement much less distracting, which is good.

> @@ -2811,6 +2818,9 @@ int read_directory(struct dir_struct *dir, struct index_state *istate,
>  			FREE_AND_NULL(dir->untracked);
>  		}
>  	}
> +
> +	if (trace2_is_enabled())
> +		trace2_read_directory_statistics(dir, istate->repo);

This slightly changes the semantics in that the original did an
equivalent emitting from inside the "if (dir->untracked)" block, but
this call is hoisted outside, and the new helper knows how to be
silent when untracked thing is not in effect, so the net effect at
this step is the same.  And if we ever add tracing statics that is
relevant when !dir->untracked is true, the new code organization is
easier to work with.

The only curious thing is the guard "if (trace2_is_enabled())";
correctness-wise, are there bad things going to happen if it is not
here, or is this a performance hack, or is it more for its
documentation value (meaning, it would be a bug if we later added
things that are irrelevant when trace is not enabled to the helper)?

> @@ -57,6 +57,19 @@ iuc () {
>  	return $ret
>  }
>  
> +get_relevant_traces() {

Style.  SP on both sides of "()".

> +	# From the GIT_TRACE2_PERF data of the form
> +	#    $TIME $FILE:$LINE | d0 | main | data | r1 | ? | ? | read_directo | $RELEVANT_STAT
> +	# extract the $RELEVANT_STAT fields.  We don't care about region_enter
> +	# or region_leave, or stats for things outside read_directory.
> +	INPUT_FILE=$1
> +	OUTPUT_FILE=$2
> +	grep data.*read_directo $INPUT_FILE \
> +	    | cut -d "|" -f 9 \
> +	    >$OUTPUT_FILE

Style.  Wrapping the line after pipe '|' will allow you to omit the
backslash.  Also quote the redirection target, i.e. >"$OUTPUT_FILE",
to help certain vintage of bash.

Those who are more familiar with the trace2 infrastructure may want
to further comment, but it looked obvious and straightforward to me.

Thanks.

  reply	other threads:[~2021-05-10  4:49 UTC|newest]

Thread overview: 90+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-07  4:04 [PATCH 0/5] Directory traversal fixes Elijah Newren via GitGitGadget
2021-05-07  4:04 ` [PATCH 1/5] t7300: add testcase showing unnecessary traversal into ignored directory Elijah Newren via GitGitGadget
2021-05-07  4:27   ` Eric Sunshine
2021-05-07  5:00     ` Elijah Newren
2021-05-07  5:31       ` Eric Sunshine
2021-05-07  5:42         ` Elijah Newren
2021-05-07  5:56           ` Eric Sunshine
2021-05-07 23:05       ` Jeff King
2021-05-07 23:15         ` Eric Sunshine
2021-05-08  0:04         ` Elijah Newren
2021-05-08  0:10           ` Eric Sunshine
2021-05-08 17:20             ` Elijah Newren
2021-05-08 11:13   ` Philip Oakley
2021-05-08 17:20     ` Elijah Newren
2021-05-07  4:04 ` [PATCH 2/5] t3001, t7300: add testcase showcasing missed directory traversal Elijah Newren via GitGitGadget
2021-05-07  4:04 ` [PATCH 3/5] dir: avoid unnecessary traversal into ignored directory Elijah Newren via GitGitGadget
2021-05-07  4:04 ` [PATCH 4/5] dir: traverse into untracked directories if they may have ignored subfiles Elijah Newren via GitGitGadget
2021-05-07  4:05 ` [PATCH 5/5] [RFC] ls-files: error out on -i unless -o or -c are specified Elijah Newren via GitGitGadget
2021-05-07 16:22 ` [PATCH 6/5] dir: update stale description of treat_directory() Derrick Stolee
2021-05-07 17:57   ` Elijah Newren
2021-05-07 16:27 ` [PATCH 0/5] Directory traversal fixes Derrick Stolee
2021-05-08  0:08 ` [PATCH v2 0/8] " Elijah Newren via GitGitGadget
2021-05-08  0:08   ` [PATCH v2 1/8] t7300: add testcase showing unnecessary traversal into ignored directory Elijah Newren via GitGitGadget
2021-05-08 10:13     ` Junio C Hamano
2021-05-08 17:34       ` Elijah Newren
2021-05-08 10:19     ` Junio C Hamano
2021-05-08 17:41       ` Elijah Newren
2021-05-08  0:08   ` [PATCH v2 2/8] t3001, t7300: add testcase showcasing missed directory traversal Elijah Newren via GitGitGadget
2021-05-08  0:08   ` [PATCH v2 3/8] dir: avoid unnecessary traversal into ignored directory Elijah Newren via GitGitGadget
2021-05-08  0:08   ` [PATCH v2 4/8] dir: traverse into untracked directories if they may have ignored subfiles Elijah Newren via GitGitGadget
2021-05-08  0:08   ` [PATCH v2 5/8] [RFC] ls-files: error out on -i unless -o or -c are specified Elijah Newren via GitGitGadget
2021-05-08  0:08   ` [PATCH v2 6/8] dir: update stale description of treat_directory() Derrick Stolee via GitGitGadget
2021-05-08  0:08   ` [PATCH v2 7/8] [RFC] dir: convert trace calls to trace2 equivalents Elijah Newren via GitGitGadget
2021-05-08  0:08   ` [PATCH v2 8/8] [RFC] dir: reported number of visited directories and paths with trace2 Elijah Newren via GitGitGadget
2021-05-08 19:58   ` [PATCH v3 0/8] Directory traversal fixes Elijah Newren via GitGitGadget
2021-05-08 19:58     ` [PATCH v3 1/8] [RFC] dir: convert trace calls to trace2 equivalents Elijah Newren via GitGitGadget
2021-05-10  4:49       ` Junio C Hamano [this message]
2021-05-11 17:23         ` Elijah Newren
2021-05-11 16:17       ` Jeff Hostetler
2021-05-11 17:29         ` Elijah Newren
2021-05-08 19:58     ` [PATCH v3 2/8] [RFC] dir: report number of visited directories and paths with trace2 Elijah Newren via GitGitGadget
2021-05-10  5:00       ` Junio C Hamano
2021-05-08 19:58     ` [PATCH v3 3/8] [RFC] ls-files: error out on -i unless -o or -c are specified Elijah Newren via GitGitGadget
2021-05-10  5:09       ` Junio C Hamano
2021-05-11 17:40         ` Elijah Newren
2021-05-11 22:32           ` Junio C Hamano
2021-05-08 19:59     ` [PATCH v3 4/8] t7300: add testcase showing unnecessary traversal into ignored directory Elijah Newren via GitGitGadget
2021-05-10  5:28       ` Junio C Hamano
2021-05-11 17:45         ` Elijah Newren
2021-05-11 22:43           ` Junio C Hamano
2021-05-12  2:07             ` Elijah Newren
2021-05-12  3:17               ` Junio C Hamano
2021-05-08 19:59     ` [PATCH v3 5/8] t3001, t7300: add testcase showcasing missed directory traversal Elijah Newren via GitGitGadget
2021-05-08 19:59     ` [PATCH v3 6/8] dir: avoid unnecessary traversal into ignored directory Elijah Newren via GitGitGadget
2021-05-10  5:48       ` Junio C Hamano
2021-05-11 17:57         ` Elijah Newren
2021-05-08 19:59     ` [PATCH v3 7/8] dir: traverse into untracked directories if they may have ignored subfiles Elijah Newren via GitGitGadget
2021-05-08 19:59     ` [PATCH v3 8/8] dir: update stale description of treat_directory() Derrick Stolee via GitGitGadget
2021-05-11 18:34     ` [PATCH v4 0/8] Directory traversal fixes Elijah Newren via GitGitGadget
2021-05-11 18:34       ` [PATCH v4 1/8] dir: convert trace calls to trace2 equivalents Elijah Newren via GitGitGadget
2021-05-11 19:06         ` Jeff Hostetler
2021-05-11 20:12           ` Elijah Newren
2021-05-11 23:12             ` Jeff Hostetler
2021-05-12  0:44               ` Elijah Newren
2021-05-12 12:26                 ` Jeff Hostetler
2021-05-12 15:24                   ` Elijah Newren
2021-05-11 18:34       ` [PATCH v4 2/8] dir: report number of visited directories and paths with trace2 Elijah Newren via GitGitGadget
2021-05-11 18:34       ` [PATCH v4 3/8] ls-files: error out on -i unless -o or -c are specified Elijah Newren via GitGitGadget
2021-05-11 18:34       ` [PATCH v4 4/8] t7300: add testcase showing unnecessary traversal into ignored directory Elijah Newren via GitGitGadget
2021-05-11 18:34       ` [PATCH v4 5/8] t3001, t7300: add testcase showcasing missed directory traversal Elijah Newren via GitGitGadget
2021-05-11 18:34       ` [PATCH v4 6/8] dir: avoid unnecessary traversal into ignored directory Elijah Newren via GitGitGadget
2021-05-11 18:34       ` [PATCH v4 7/8] dir: traverse into untracked directories if they may have ignored subfiles Elijah Newren via GitGitGadget
2021-05-11 18:34       ` [PATCH v4 8/8] dir: update stale description of treat_directory() Derrick Stolee via GitGitGadget
2021-05-12 17:28       ` [PATCH v5 0/9] Directory traversal fixes Elijah Newren via GitGitGadget
2021-05-12 17:28         ` [PATCH v5 1/9] dir: convert trace calls to trace2 equivalents Elijah Newren via GitGitGadget
2021-05-12 17:28         ` [PATCH v5 2/9] dir: report number of visited directories and paths with trace2 Elijah Newren via GitGitGadget
2021-05-12 17:28         ` [PATCH v5 3/9] ls-files: error out on -i unless -o or -c are specified Elijah Newren via GitGitGadget
2021-05-12 17:28         ` [PATCH v5 4/9] t7300: add testcase showing unnecessary traversal into ignored directory Elijah Newren via GitGitGadget
2021-05-12 17:28         ` [PATCH v5 5/9] t3001, t7300: add testcase showcasing missed directory traversal Elijah Newren via GitGitGadget
2021-05-12 17:28         ` [PATCH v5 6/9] dir: avoid unnecessary traversal into ignored directory Elijah Newren via GitGitGadget
2021-05-12 17:28         ` [PATCH v5 7/9] dir: traverse into untracked directories if they may have ignored subfiles Elijah Newren via GitGitGadget
2021-05-12 17:28         ` [PATCH v5 8/9] dir: update stale description of treat_directory() Derrick Stolee via GitGitGadget
2021-05-17 17:20           ` Derrick Stolee
2021-05-17 19:44             ` Junio C Hamano
2021-05-18  3:32               ` Elijah Newren
2021-05-19  1:44                 ` Junio C Hamano
2021-05-12 17:28         ` [PATCH v5 9/9] dir: introduce readdir_skip_dot_and_dotdot() helper Elijah Newren via GitGitGadget
2021-05-17 17:22           ` Derrick Stolee
2021-05-18  3:34             ` Elijah Newren
2021-05-17 17:23         ` [PATCH v5 0/9] Directory traversal fixes Derrick Stolee

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