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From: Jeff King <peff@peff.net>
To: Jeff Hostetler <git@jeffhostetler.com>
Cc: Johannes Schindelin <Johannes.Schindelin@gmx.de>,
	Johannes Schindelin via GitGitGadget <gitgitgadget@gmail.com>,
	git@vger.kernel.org, Junio C Hamano <gitster@pobox.com>
Subject: [PATCH 2/3] common-main: delay trace2 initialization
Date: Tue, 6 Aug 2019 08:27:26 -0400	[thread overview]
Message-ID: <20190806122725.GB13513@sigill.intra.peff.net> (raw)
In-Reply-To: <20190806122601.GA21475@sigill.intra.peff.net>

We initialize the trace2 system in the common main() function so that
all programs (even ones that aren't builtins) will enable tracing. But
trace2 startup is relatively heavy-weight, as we have to actually read
on-disk config to decide whether to trace. This can cause unexpected
interactions with other common-main initialization. For instance, we'll
end up in the config code before calling initialize_the_repository(),
and the usual invariant that the_repository is never NULL will not hold.

Let's push the trace2 initialization further down in common-main, to
just before we execute cmd_main(). The other parts of the initialization
are much more self-contained and less likely to call library code that
depends on those kinds of invariants.

Originally the trace2 code tried to start as early as possible to get
accurate timings. But the timer initialization was split out from the
config reading in a089724958 (trace2: refactor setting process starting
time, 2019-04-15), so there shouldn't be any impact from this patch.

Signed-off-by: Jeff King <peff@peff.net>
---
 common-main.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/common-main.c b/common-main.c
index 582a7b1886..71e21dd20a 100644
--- a/common-main.c
+++ b/common-main.c
@@ -39,16 +39,16 @@ int main(int argc, const char **argv)
 
 	git_resolve_executable_dir(argv[0]);
 
-	trace2_initialize();
-	trace2_cmd_start(argv);
-	trace2_collect_process_info(TRACE2_PROCESS_INFO_STARTUP);
-
 	git_setup_gettext();
 
 	initialize_the_repository();
 
 	attr_start();
 
+	trace2_initialize();
+	trace2_cmd_start(argv);
+	trace2_collect_process_info(TRACE2_PROCESS_INFO_STARTUP);
+
 	result = cmd_main(argc, argv);
 
 	trace2_cmd_exit(result);
-- 
2.23.0.rc1.436.g24d2e81391


  parent reply	other threads:[~2019-08-06 12:27 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-31 19:53 [PATCH 0/1] Make the includeif:onbranch feature more robust Johannes Schindelin via GitGitGadget
2019-07-31 19:53 ` [PATCH 1/1] config: work around bug with includeif:onbranch and early config Johannes Schindelin via GitGitGadget
2019-07-31 21:37   ` Junio C Hamano
2019-07-31 20:06 ` [PATCH v2 0/1] Make the includeif:onbranch feature more robust Johannes Schindelin via GitGitGadget
2019-07-31 20:06   ` [PATCH v2 1/1] config: work around bug with includeif:onbranch and early config Johannes Schindelin via GitGitGadget
2019-07-31 22:02     ` Jeff King
2019-07-31 22:13       ` Johannes Schindelin
2019-07-31 23:12         ` Jeff King
2019-08-01  0:49           ` Jeff King
2019-08-01 17:24             ` Jeff Hostetler
2019-08-06 12:26               ` [PATCH 0/3] the_repository initialization cleanup Jeff King
2019-08-06 12:26                 ` [PATCH 1/3] t1309: use short branch name in includeIf.onbranch test Jeff King
2019-08-06 12:27                 ` Jeff King [this message]
2019-08-06 12:27                 ` [PATCH 3/3] config: stop checking whether the_repository is NULL Jeff King
2019-08-06 12:49                   ` Jeff King
2019-08-08 19:48                     ` Johannes Schindelin
2019-08-06 12:56               ` [PATCH v2 1/1] config: work around bug with includeif:onbranch and early config Jeff King

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