From: Jeff King <peff@peff.net>
To: Michael Haggerty <mhagger@alum.mit.edu>
Cc: Junio C Hamano <gitster@pobox.com>,
Johan Herland <johan@herland.net>,
git@vger.kernel.org
Subject: Re: [PATCH 00/12] Fix some reference-related races
Date: Wed, 12 Jun 2013 08:52:35 -0400 [thread overview]
Message-ID: <20130612125235.GA28876@sigill.intra.peff.net> (raw)
In-Reply-To: <1370987312-6761-1-git-send-email-mhagger@alum.mit.edu>
On Tue, Jun 11, 2013 at 11:48:20PM +0200, Michael Haggerty wrote:
> *This patch series must be built on top of mh/reflife.*
Applying on top of what Junio has in mh/reflife seems to create
conflicts at the first patch. I didn't look into it, though, but just
read the patches and looked at the packed-refs-transactions branch at
git://github.com/mhagger/git.git.
> The other problem was that the for_each_ref() functions will die if
> the ref cache that they are iterating over is freed out from under
> them. This problem is solved by using reference counts to avoid
> freeing the old packed ref cache (even if it is no longer valid) until
> all users are done with it.
I was worried that the reference-counting would end up invasive and
ugly, but it turned out quite nice.
Overall, I think the series goes in the right direction, and I didn't
see any implementation flaws. The core of the race-handling is the same
as in mine, but your "hyperactive repository" patch shows how badly mine
can break under load.
I sent a few comments to specific patches, but I'd be fine with applying
it as-is. Thanks for working on it.
-Peff
next prev parent reply other threads:[~2013-06-12 12:52 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-11 21:48 [PATCH 00/12] Fix some reference-related races Michael Haggerty
2013-06-11 21:48 ` [PATCH 01/12] repack_without_ref(): split list curation and entry writing Michael Haggerty
2013-06-12 11:38 ` Jeff King
2013-06-12 11:56 ` Michael Haggerty
2013-06-11 21:48 ` [PATCH 02/12] pack_refs(): split creation of packed refs " Michael Haggerty
2013-06-11 21:48 ` [PATCH 03/12] refs: wrap the packed refs cache in a level of indirection Michael Haggerty
2013-06-11 21:48 ` [PATCH 04/12] refs: implement simple transactions for the packed-refs file Michael Haggerty
2013-06-12 12:01 ` Jeff King
2013-06-11 21:48 ` [PATCH 05/12] refs: manage lifetime of packed refs cache via reference counting Michael Haggerty
2013-06-11 21:48 ` [PATCH 06/12] do_for_each_entry(): increment the packed refs cache refcount Michael Haggerty
2013-06-11 21:48 ` [PATCH 07/12] packed_ref_cache: increment refcount when locked Michael Haggerty
2013-06-11 21:48 ` [PATCH 08/12] Extract a struct stat_data from cache_entry Michael Haggerty
2013-06-11 21:48 ` [PATCH 09/12] add a stat_validity struct Michael Haggerty
2013-06-11 21:48 ` [PATCH 10/12] get_packed_ref_cache: reload packed-refs file when it changes Michael Haggerty
2013-06-11 21:48 ` [PATCH 11/12] for_each_ref: load all loose refs before packed refs Michael Haggerty
2013-06-11 21:48 ` [PATCH 12/12] refs: do not invalidate the packed-refs cache unnecessarily Michael Haggerty
2013-06-12 12:39 ` Jeff King
2013-06-12 12:52 ` Jeff King [this message]
2013-06-15 20:13 ` [PATCH 00/12] Fix some reference-related races Ramsay Jones
2013-06-16 5:50 ` Michael Haggerty
2013-06-18 18:13 ` Ramsay Jones
2013-06-19 5:51 ` Michael Haggerty
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