From: Junio C Hamano <gitster@pobox•com>
To: Jeff King <peff@peff•net>
Cc: git@vger•kernel.org, Christian Couder <chriscool@tuxfamily•org>,
Jakub Narebski <jnareb@gmail•com>,
Eric Sunshine <sunshine@sunshineco•com>
Subject: Re: [PATCH 15/17] commit-slab: provide a static initializer
Date: Thu, 12 Jun 2014 11:15:49 -0700 [thread overview]
Message-ID: <xmqq7g4m6lka.fsf@gitster.dls.corp.google.com> (raw)
In-Reply-To: <20140610214251.GO19147@sigill.intra.peff.net> (Jeff King's message of "Tue, 10 Jun 2014 17:42:51 -0400")
Jeff King <peff@peff•net> writes:
> Callers currently must use init_foo_slab() at runtime before
> accessing a slab. For global slabs, it's much nicer if we
> can initialize them in BSS, so that each user does not have
> to add code to check-and-initialize.
>
> Signed-off-by: Jeff King <peff@peff•net>
> ---
> There was no comment on this one in v1. I'd be curious if anyone has
> comments on what I wrote in:
>
> http://article.gmane.org/gmane.comp.version-control.git/251099
Why do we need an initialiser at this point (in other words, how
have other existing slab users coped without having one)?
I think they call init_*_slab() when the slab is needed/used the
first time (e.g. it is not even worth initialising indegree slab
unless we are sorting in topo order).
Unlike the author-date and indegree slabs, there are too many entry
points that may want access to the buffer slab (save_commit_buffer's
default being on does not help us either), so it would be much less
error prone to always initialise a static slab like this patch does,
I guess.
> commit-slab.h | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> diff --git a/commit-slab.h b/commit-slab.h
> index cc114b5..375c9c7 100644
> --- a/commit-slab.h
> +++ b/commit-slab.h
> @@ -117,4 +117,16 @@ static int stat_ ##slabname## realloc
> * catch because GCC silently parses it by default.
> */
>
> +/*
> + * Statically initialize a commit slab named "var". Note that this
> + * evaluates "stride" multiple times! Example:
> + *
> + * struct indegree indegrees = COMMIT_SLAB_INIT(1, indegrees);
> + *
> + */
> +#define COMMIT_SLAB_INIT(stride, var) { \
> + COMMIT_SLAB_SIZE / sizeof(**((var).slab)) / (stride), \
> + (stride), 0, NULL \
> +}
> +
> #endif /* COMMIT_SLAB_H */
next prev parent reply other threads:[~2014-06-12 18:16 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-09 18:02 [PATCH 0/15] store length of commit->buffer Jeff King
2014-06-09 18:09 ` [PATCH 01/15] alloc: include any-object allocations in alloc_report Jeff King
2014-06-09 18:09 ` [PATCH 02/15] commit: push commit_index update into alloc_commit_node Jeff King
2014-06-10 21:31 ` Junio C Hamano
2014-06-09 18:10 ` [PATCH 03/15] do not create "struct commit" with xcalloc Jeff King
2014-06-10 21:35 ` Junio C Hamano
2014-06-10 21:49 ` Jeff King
2014-06-09 18:10 ` [PATCH 04/15] logmsg_reencode: return const buffer Jeff King
2014-06-10 1:36 ` Eric Sunshine
2014-06-09 18:10 ` [PATCH 05/15] sequencer: use logmsg_reencode in get_message Jeff King
2014-06-10 21:40 ` Junio C Hamano
2014-06-10 21:50 ` Jeff King
2014-06-09 18:11 ` [PATCH 06/15] provide a helper to free commit buffer Jeff King
2014-06-09 18:11 ` [PATCH 07/15] provide a helper to set the " Jeff King
2014-06-09 18:11 ` [PATCH 08/15] provide helpers to access " Jeff King
2014-06-10 8:00 ` Eric Sunshine
2014-06-09 18:12 ` [PATCH 09/15] use get_cached_commit_buffer where appropriate Jeff King
2014-06-09 18:12 ` [PATCH 10/15] use get_commit_buffer to avoid duplicate code Jeff King
2014-06-10 8:01 ` Eric Sunshine
2014-06-10 20:34 ` Jeff King
2014-06-09 18:13 ` [PATCH 11/15] convert logmsg_reencode to get_commit_buffer Jeff King
2014-06-09 18:13 ` [PATCH 12/15] use get_commit_buffer everywhere Jeff King
2014-06-09 22:40 ` Junio C Hamano
2014-06-10 0:02 ` Jeff King
2014-06-10 0:22 ` Jeff King
2014-06-10 16:06 ` Junio C Hamano
2014-06-10 21:27 ` Jeff King
2014-06-09 18:15 ` [PATCH 13/15] commit-slab: provide a static initializer Jeff King
2014-06-09 18:15 ` [PATCH 14/15] commit: convert commit->buffer to a slab Jeff King
2014-06-09 18:15 ` [PATCH 15/15] commit: record buffer length in cache Jeff King
2014-06-10 5:12 ` Christian Couder
2014-06-10 5:27 ` Jeff King
2014-06-10 20:33 ` Jeff King
2014-06-10 21:30 ` Christian Couder
2014-06-10 21:35 ` [PATCH v2 0/17] store length of commit->buffer Jeff King
2014-06-10 21:36 ` [PATCH 01/17] commit_tree: take a pointer/len pair rather than a const strbuf Jeff King
2014-06-10 21:38 ` [PATCH 02/17] replace dangerous uses of strbuf_attach Jeff King
2014-06-10 21:38 ` [PATCH 03/17] alloc: include any-object allocations in alloc_report Jeff King
2014-06-10 21:39 ` [PATCH 04/17] commit: push commit_index update into alloc_commit_node Jeff King
2014-06-10 21:39 ` [PATCH 05/17] do not create "struct commit" with xcalloc Jeff King
2014-06-10 21:39 ` [PATCH 06/17] logmsg_reencode: return const buffer Jeff King
2014-06-10 21:39 ` [PATCH 07/17] sequencer: use logmsg_reencode in get_message Jeff King
2014-06-10 21:40 ` [PATCH 08/17] provide a helper to free commit buffer Jeff King
2014-06-12 18:22 ` Junio C Hamano
2014-06-12 20:08 ` Jeff King
2014-06-12 22:05 ` Jeff King
2014-06-10 21:40 ` [PATCH 09/17] provide a helper to set the " Jeff King
2014-06-10 21:40 ` [PATCH 10/17] provide helpers to access " Jeff King
2014-06-10 21:40 ` [PATCH 11/17] use get_cached_commit_buffer where appropriate Jeff King
2014-06-10 21:41 ` [PATCH 12/17] use get_commit_buffer to avoid duplicate code Jeff King
2014-06-10 21:41 ` [PATCH 13/17] convert logmsg_reencode to get_commit_buffer Jeff King
2014-06-10 21:41 ` [PATCH 14/17] use get_commit_buffer everywhere Jeff King
2014-06-10 21:42 ` [PATCH 15/17] commit-slab: provide a static initializer Jeff King
2014-06-12 18:15 ` Junio C Hamano [this message]
2014-06-12 19:51 ` Jeff King
2014-06-10 21:43 ` [PATCH 16/17] commit: convert commit->buffer to a slab Jeff King
2014-06-10 21:44 ` [PATCH 17/17] commit: record buffer length in cache Jeff King
2014-06-10 21:46 ` [PATCH v2 0/17] store length of commit->buffer Jeff King
2014-06-12 17:22 ` Junio C Hamano
2014-06-13 6:32 ` [PATCH v2] reuse cached commit buffer when parsing signatures Jeff King
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