From: Jeff King <peff@peff.net>
To: Christian Couder <christian.couder@gmail.com>
Cc: Jonathan Tan <jonathantanmy@google.com>,
git <git@vger.kernel.org>, Junio C Hamano <gitster@pobox.com>,
Christian Couder <chriscool@tuxfamily.org>,
Ramsay Jones <ramsay@ramsayjones.plus.com>
Subject: Re: [RFC PATCH 04/10] ewah/bitmap: always allocate 2 more words
Date: Fri, 11 Oct 2019 14:05:07 -0400 [thread overview]
Message-ID: <20191011180507.GB20601@sigill.intra.peff.net> (raw)
In-Reply-To: <CAP8UFD0-NHCj6KcbdMG3bCwWp=wUdoYugLggsbnpvr1d6-P4yg@mail.gmail.com>
On Fri, Oct 11, 2019 at 09:49:53AM +0200, Christian Couder wrote:
> > I think this should be squashed with patch 3, adding to that commit
> > message "since word_alloc might be 0, we need to change the growth
> > function". (Or just make the minimum word_alloc be 1 or 32 or something
> > positive, if that's possible.)
>
> Yeah, thank you for the suggestion. I still wonder why 2 is added
> instead of just 1 though.
Yeah, I think it should be squashed. I think it is not intentionally 2,
it is just that adding "1" to block makes sure we always make forward
progress. It could equally well be:
self->word_alloc = block ? block * 2 : 1;
I think. Or probably this whole thing could be ALLOC_GROW(), as the
numbers aren't particularly important. I guess we need to make sure the
grown part is zero'd, so probably using alloc_nr() directly would make
more sense.
-Peff
next prev parent reply other threads:[~2019-10-11 18:05 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-13 13:02 [RFC PATCH 00/10] Rewrite packfile reuse code Christian Couder
2019-09-13 13:02 ` [RFC PATCH 01/10] builtin/pack-objects: report reused packfile objects Christian Couder
2019-09-13 13:02 ` [RFC PATCH 02/10] packfile: expose get_delta_base() Christian Couder
2019-09-13 13:02 ` [RFC PATCH 03/10] ewah/bitmap: introduce bitmap_word_alloc() Christian Couder
2019-09-13 13:02 ` [RFC PATCH 04/10] ewah/bitmap: always allocate 2 more words Christian Couder
2019-10-10 23:40 ` Jonathan Tan
2019-10-11 7:49 ` Christian Couder
2019-10-11 18:05 ` Jeff King [this message]
2019-09-13 13:02 ` [RFC PATCH 05/10] pack-bitmap: don't rely on bitmap_git->reuse_objects Christian Couder
2019-10-10 23:44 ` Jonathan Tan
2019-10-11 7:50 ` Christian Couder
2019-09-13 13:02 ` [RFC PATCH 06/10] pack-bitmap: introduce bitmap_walk_contains() Christian Couder
2019-09-13 13:02 ` [RFC PATCH 07/10] csum-file: introduce hashfile_total() Christian Couder
2019-09-13 13:02 ` [RFC PATCH 08/10] pack-objects: introduce pack.allowPackReuse Christian Couder
2019-09-13 21:37 ` Junio C Hamano
2019-09-13 13:02 ` [RFC PATCH 09/10] builtin/pack-objects: introduce obj_is_packed() Christian Couder
2019-09-13 13:02 ` [RFC PATCH 10/10] pack-objects: improve partial packfile reuse Christian Couder
2019-09-13 22:29 ` Junio C Hamano
2019-09-14 2:02 ` Jeff King
2019-09-14 3:06 ` Junio C Hamano
2019-10-02 15:57 ` Jeff King
2019-10-03 2:06 ` Junio C Hamano
2019-10-03 6:55 ` Christian Couder
2019-10-10 23:59 ` Jonathan Tan
2019-10-11 7:39 ` Christian Couder
2019-10-11 18:01 ` Jeff King
2019-10-11 21:04 ` Jonathan Tan
2019-10-12 0:04 ` Junio C Hamano
2019-10-13 7:38 ` Jeff King
2019-10-17 7:03 ` Junio C Hamano
2019-10-17 7:23 ` Jeff King
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