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From: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
To: git@vger.kernel.org
Cc: "Junio C Hamano" <gitster@pobox.com>, "Jeff King" <peff@peff.net>,
	"SZEDER Gábor" <szeder.dev@gmail.com>,
	"Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Subject: [PATCH 0/5] cocci: make "incremental" possible + a ccache-like tool
Date: Thu, 25 Aug 2022 16:36:12 +0200	[thread overview]
Message-ID: <cover-0.5-00000000000-20220825T141212Z-avarab@gmail.com> (raw)

This series makes the "coccicheck" rule incremental by only re-running
"spatch" for those file/rule combinations that changed.

The result is that e.g. running "make coccicheck" followed by a:

	make -W grep.c coccicheck

Will take around 2s instead of a *lot* longer. The 3/5 change has all
the details about this, and why it's safe.

Furthermore we'll properly handle re-building if any of the required
headers change (e.g. column.h).

I had a previous stab at trying to make "coccicheck" faster a while
ago in [1], but that was fatally flawed because it would break in
cases where grep.c e.g. dependen on a header that changed.

This series doesn't suffer from that issue, because we piggy-back on
the corresponding .depend/* files to extract dependency info. This
does mean that the incremental speed-ups depend on
COMPUTE_HEADER_DEPENDENCIES=yes (which is the case with "gcc" and
"clang" by default).

I've been running with this series locally for a while. I think it
should fully solve the lamentations about the coccicheck being too
slow (e.g. in [2]), particularly when paired with the new
"spatchcache" helper added in 5/5.

Even without that helper running "make coccicheck" e.g. after applying
a patch series now becomes viable, provided the patches don't modify
one of the "rebuild everything" files we have (such as cache.h and
git-compat-util.h).

1. https://lore.kernel.org/git/20210302205103.12230-1-avarab@gmail.com/
2. https://lore.kernel.org/git/xmqqh7249b8d.fsf@gitster.g/

Ævar Arnfjörð Bjarmason (5):
  Makefile: add ability to TAB-complete cocci *.patch rules
  Makefile: have "coccicheck" re-run if flags change
  cocci: make "coccicheck" rule incremental
  cocci: make incremental compilation even faster
  spatchcache: add a ccache-alike for "spatch"

 .gitignore                                    |   1 +
 Makefile                                      | 114 +++++++--
 contrib/coccinelle/spatchcache                | 217 ++++++++++++++++++
 .../coccinelle/the_repository.pending.cocci   |   1 -
 shared.mak                                    |   4 +-
 5 files changed, 310 insertions(+), 27 deletions(-)
 create mode 100755 contrib/coccinelle/spatchcache

-- 
2.37.2.1279.g64dec4e13cf


             reply	other threads:[~2022-08-25 14:37 UTC|newest]

Thread overview: 72+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-08-25 14:36 Ævar Arnfjörð Bjarmason [this message]
2022-08-25 14:36 ` [PATCH 1/5] Makefile: add ability to TAB-complete cocci *.patch rules Ævar Arnfjörð Bjarmason
2022-08-25 14:36 ` [PATCH 2/5] Makefile: have "coccicheck" re-run if flags change Ævar Arnfjörð Bjarmason
2022-08-25 15:29   ` SZEDER Gábor
2022-08-25 14:36 ` [PATCH 3/5] cocci: make "coccicheck" rule incremental Ævar Arnfjörð Bjarmason
2022-08-25 19:44   ` SZEDER Gábor
2022-08-25 22:18     ` Ævar Arnfjörð Bjarmason
2022-08-26 10:43       ` SZEDER Gábor
2022-08-25 14:36 ` [PATCH 4/5] cocci: make incremental compilation even faster Ævar Arnfjörð Bjarmason
2022-08-25 14:36 ` [PATCH 5/5] spatchcache: add a ccache-alike for "spatch" Ævar Arnfjörð Bjarmason
2022-08-31 20:57 ` [PATCH v2 0/9] cocci: make "incremental" possible + a ccache-like tool Ævar Arnfjörð Bjarmason
2022-08-31 20:57   ` [PATCH v2 1/9] cocci rules: remove unused "F" metavariable from pending rule Ævar Arnfjörð Bjarmason
2022-08-31 20:57   ` [PATCH v2 2/9] Makefile: add ability to TAB-complete cocci *.patch rules Ævar Arnfjörð Bjarmason
2022-08-31 20:57   ` [PATCH v2 3/9] Makefile: have "coccicheck" re-run if flags change Ævar Arnfjörð Bjarmason
2022-08-31 20:57   ` [PATCH v2 4/9] Makefile: split off SPATCH_BATCH_SIZE comment from "cocci" heading Ævar Arnfjörð Bjarmason
2022-08-31 20:57   ` [PATCH v2 5/9] cocci: split off include-less "tests" from SPATCH_FLAGS Ævar Arnfjörð Bjarmason
2022-08-31 20:57   ` [PATCH v2 6/9] cocci: split off "--all-includes" " Ævar Arnfjörð Bjarmason
2022-08-31 20:57   ` [PATCH v2 7/9] cocci: make "coccicheck" rule incremental Ævar Arnfjörð Bjarmason
2022-09-01 16:38     ` SZEDER Gábor
2022-09-01 18:04       ` Ævar Arnfjörð Bjarmason
2022-08-31 20:57   ` [PATCH v2 8/9] cocci: optimistically use COMPUTE_HEADER_DEPENDENCIES Ævar Arnfjörð Bjarmason
2022-08-31 20:57   ` [PATCH v2 9/9] spatchcache: add a ccache-alike for "spatch" Ævar Arnfjörð Bjarmason
2022-10-14 15:31   ` [PATCH v3 00/11] cocci: make "incremental" possible + a ccache-like tool Ævar Arnfjörð Bjarmason
2022-10-14 15:31     ` [PATCH v3 01/11] Makefile + shared.mak: rename and indent $(QUIET_SPATCH_T) Ævar Arnfjörð Bjarmason
2022-10-14 15:31     ` [PATCH v3 02/11] cocci rules: remove unused "F" metavariable from pending rule Ævar Arnfjörð Bjarmason
2022-10-14 15:31     ` [PATCH v3 03/11] Makefile: add ability to TAB-complete cocci *.patch rules Ævar Arnfjörð Bjarmason
2022-10-14 15:31     ` [PATCH v3 04/11] Makefile: have "coccicheck" re-run if flags change Ævar Arnfjörð Bjarmason
2022-10-14 15:31     ` [PATCH v3 05/11] Makefile: split off SPATCH_BATCH_SIZE comment from "cocci" heading Ævar Arnfjörð Bjarmason
2022-10-14 20:39       ` Taylor Blau
2022-10-14 15:31     ` [PATCH v3 06/11] cocci: split off include-less "tests" from SPATCH_FLAGS Ævar Arnfjörð Bjarmason
2022-10-14 15:31     ` [PATCH v3 07/11] cocci: split off "--all-includes" " Ævar Arnfjörð Bjarmason
2022-10-14 15:31     ` [PATCH v3 08/11] cocci: make "coccicheck" rule incremental Ævar Arnfjörð Bjarmason
2022-10-14 15:31     ` [PATCH v3 09/11] cocci: optimistically use COMPUTE_HEADER_DEPENDENCIES Ævar Arnfjörð Bjarmason
2022-10-14 15:31     ` [PATCH v3 10/11] cocci: run against a generated ALL.cocci Ævar Arnfjörð Bjarmason
2022-10-14 15:31     ` [PATCH v3 11/11] spatchcache: add a ccache-alike for "spatch" Ævar Arnfjörð Bjarmason
2022-10-17 17:50     ` [PATCH v3 00/11] cocci: make "incremental" possible + a ccache-like tool Jeff King
2022-10-17 18:36       ` Ævar Arnfjörð Bjarmason
2022-10-17 19:08         ` Junio C Hamano
2022-10-17 19:18         ` Jeff King
2022-10-26 14:20     ` [PATCH v4 00/12] " Ævar Arnfjörð Bjarmason
2022-10-26 14:20       ` [PATCH v4 01/12] Makefile + shared.mak: rename and indent $(QUIET_SPATCH_T) Ævar Arnfjörð Bjarmason
2022-10-26 14:20       ` [PATCH v4 02/12] cocci rules: remove unused "F" metavariable from pending rule Ævar Arnfjörð Bjarmason
2022-10-26 14:20       ` [PATCH v4 03/12] Makefile: add ability to TAB-complete cocci *.patch rules Ævar Arnfjörð Bjarmason
2022-10-26 14:20       ` [PATCH v4 04/12] Makefile: have "coccicheck" re-run if flags change Ævar Arnfjörð Bjarmason
2022-10-26 14:20       ` [PATCH v4 05/12] Makefile: split off SPATCH_BATCH_SIZE comment from "cocci" heading Ævar Arnfjörð Bjarmason
2022-10-26 14:20       ` [PATCH v4 06/12] cocci: split off include-less "tests" from SPATCH_FLAGS Ævar Arnfjörð Bjarmason
2022-10-26 14:20       ` [PATCH v4 07/12] cocci: split off "--all-includes" " Ævar Arnfjörð Bjarmason
2022-10-26 14:20       ` [PATCH v4 08/12] cocci: make "coccicheck" rule incremental Ævar Arnfjörð Bjarmason
2022-10-26 14:20       ` [PATCH v4 09/12] cocci: optimistically use COMPUTE_HEADER_DEPENDENCIES Ævar Arnfjörð Bjarmason
2022-10-26 14:20       ` [PATCH v4 10/12] cocci rules: remove <id>'s from rules that don't need them Ævar Arnfjörð Bjarmason
2022-10-26 14:20       ` [PATCH v4 11/12] cocci: run against a generated ALL.cocci Ævar Arnfjörð Bjarmason
2022-10-28 12:58         ` SZEDER Gábor
2022-10-26 14:20       ` [PATCH v4 12/12] spatchcache: add a ccache-alike for "spatch" Ævar Arnfjörð Bjarmason
2022-11-01 22:35       ` [PATCH v5 00/13] cocci: make "incremental" possible + a ccache-like tool Ævar Arnfjörð Bjarmason
2022-11-01 22:35         ` [PATCH v5 01/13] Makefile + shared.mak: rename and indent $(QUIET_SPATCH_T) Ævar Arnfjörð Bjarmason
2022-11-01 22:35         ` [PATCH v5 02/13] cocci rules: remove unused "F" metavariable from pending rule Ævar Arnfjörð Bjarmason
2022-11-01 22:35         ` [PATCH v5 03/13] Makefile: add ability to TAB-complete cocci *.patch rules Ævar Arnfjörð Bjarmason
2022-11-01 22:35         ` [PATCH v5 04/13] Makefile: have "coccicheck" re-run if flags change Ævar Arnfjörð Bjarmason
2022-11-01 22:35         ` [PATCH v5 05/13] Makefile: split off SPATCH_BATCH_SIZE comment from "cocci" heading Ævar Arnfjörð Bjarmason
2022-11-01 22:35         ` [PATCH v5 06/13] cocci: split off include-less "tests" from SPATCH_FLAGS Ævar Arnfjörð Bjarmason
2022-11-01 22:35         ` [PATCH v5 07/13] cocci: split off "--all-includes" " Ævar Arnfjörð Bjarmason
2022-11-01 22:35         ` [PATCH v5 08/13] cocci: make "coccicheck" rule incremental Ævar Arnfjörð Bjarmason
2022-11-09 14:57           ` SZEDER Gábor
2022-11-01 22:35         ` [PATCH v5 09/13] cocci: optimistically use COMPUTE_HEADER_DEPENDENCIES Ævar Arnfjörð Bjarmason
2022-11-01 22:35         ` [PATCH v5 10/13] Makefile: copy contrib/coccinelle/*.cocci to build/ Ævar Arnfjörð Bjarmason
2022-11-09 15:05           ` SZEDER Gábor
2022-11-09 15:42             ` Ævar Arnfjörð Bjarmason
2022-11-10 16:14               ` [PATCH] Makefile: don't create a ".build/.build/" for cocci, fix output Ævar Arnfjörð Bjarmason
2022-11-11 22:22                 ` Taylor Blau
2022-11-01 22:35         ` [PATCH v5 11/13] cocci rules: remove <id>'s from rules that don't need them Ævar Arnfjörð Bjarmason
2022-11-01 22:35         ` [PATCH v5 12/13] cocci: run against a generated ALL.cocci Ævar Arnfjörð Bjarmason
2022-11-01 22:35         ` [PATCH v5 13/13] spatchcache: add a ccache-alike for "spatch" Ævar Arnfjörð Bjarmason

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