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From: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
To: Eric Wong <e@80x24.org>
Cc: Jeff King <peff@peff.net>,
	git@vger.kernel.org, Junio C Hamano <gitster@pobox.com>
Subject: Re: [PATCH v2] server-info: do not list unlinked packs
Date: Fri, 24 May 2019 09:34:21 +0200	[thread overview]
Message-ID: <87sgt4fgqq.fsf@evledraar.gmail.com> (raw)
In-Reply-To: <20190523172723.eny6smdt57zxau6z@dcvr>


On Thu, May 23 2019, Eric Wong wrote:

> Jeff King <peff@peff.net> wrote:
>> On Thu, May 23, 2019 at 08:59:59AM +0000, Eric Wong wrote:
>>
>> > > We never delete entries from the in-memory packed_git list; a reprepare
>> > > only adds to the list. You'd need to teach update_server_info() to
>> > > ignore packs which are no longer present (or switch to exec-ing a
>> > > separate update-server-info binary).
>> >
>> > Ah, checking files_exists() and setting a bit seems sufficient.
>>
>> Yes, though we do we even need to store the bit?
>
> I wanted to avoid the over-allocation, and I hit a bounds error
> because I forgot to adjust num_pack as you mentioned
> below. [...]ALLOC_GROW makes the whole thing much nicer.

If you want to avoid over-allocation the last thing you want is
ALLOC_GROW() :)

I.e. see alloc_nr() in cache.h, we explicitly over-allocate with it.

But as our extensive use of it shows this sort of pattern is the right
trade-off, both in terms of performance on modern hardware, and code
readability in cases like this where we're never going to realistically
have to worry about memory pressure.

  parent reply	other threads:[~2019-05-24  8:18 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-11  1:34 [PATCH] update-server-info: avoid needless overwrites Eric Wong
2019-05-11  7:35 ` Eric Sunshine
2019-05-11 20:47   ` [PATCH v2] " Eric Wong
2019-05-11 21:17 ` [PATCH] " Eric Wong
2019-05-11 23:37 ` Ævar Arnfjörð Bjarmason
2019-05-12  0:38   ` Eric Wong
2019-05-12  4:08   ` Jeff King
2019-05-12  7:16     ` Ævar Arnfjörð Bjarmason
2019-05-14  9:47       ` Jeff King
2019-05-14 10:33         ` Ævar Arnfjörð Bjarmason
2019-05-14 11:24           ` Jeff King
2019-05-14 11:57             ` Ævar Arnfjörð Bjarmason
2019-05-14 11:50         ` Eric Wong
2019-05-14 12:13           ` dumb HTTP things I want to do Eric Wong
2019-05-14 12:27             ` Jeff King
2019-05-14 12:19           ` [PATCH] update-server-info: avoid needless overwrites Ævar Arnfjörð Bjarmason
2019-05-14 12:29             ` Jeff King
2019-05-15  0:45             ` [PATCH 2/1] server-info: conditionally update on fetch Eric Wong
2019-05-15 20:38               ` [WIP] repack leaving stale entries in objects/info/packs Eric Wong
2019-05-15 21:48                 ` Jeff King
2019-05-23  8:59                   ` [PATCH] server-info: do not list unlinked packs Eric Wong
2019-05-23 10:24                     ` Jeff King
2019-05-23 17:27                       ` [PATCH v2] " Eric Wong
2019-05-24  6:05                         ` Jeff King
2019-05-24  7:34                         ` Ævar Arnfjörð Bjarmason [this message]
2019-05-13 23:17 ` [PATCH v3] update-server-info: avoid needless overwrites Eric Wong

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