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From: Jeff King <peff@peff.net>
To: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Cc: git@vger.kernel.org, Junio C Hamano <gitster@pobox.com>
Subject: Re: [PATCH 5/6] pack-bitmap: save "have" bitmap from walk
Date: Fri, 31 Aug 2018 18:55:58 -0400	[thread overview]
Message-ID: <20180831225558.GA22917@sigill.intra.peff.net> (raw)
In-Reply-To: <8736uud0gq.fsf@evledraar.gmail.com>

On Fri, Aug 31, 2018 at 05:23:17PM +0200, Ævar Arnfjörð Bjarmason wrote:

> On Tue, Aug 21 2018, Jeff King wrote:
> 
> > +int bitmap_has_sha1_in_uninteresting(struct bitmap_index *bitmap_git,
> > +				     const unsigned char *sha1)
> > +{
> > +	int pos;
> > +
> > +	if (!bitmap_git)
> > +		return 0; /* no bitmap loaded */
> > +	if (!bitmap_git->result)
> > +		BUG("failed to perform bitmap walk before querying");
> 
> Some part of what calls this completely breaks pushing from the "next"
> branch when you have local bitmaps (we *really* should have some tests
> for this...).

Yikes, thanks for reporting. I agree we need better tests here.

This assertion is totally bogus, as traverse_bitmap_commit_list() will
actually free (and NULL) the result field! This is a holdover from the
original bitmap code, where bitmap_git was a static, and this is how you
might prepare a second walk (though AFAIK only ever do one walk per
process). These days prepare_bitmap_walk() actually returns a fresh
bitmap_index struct.

So there's no way to know if traverse_bitmap_commit_list() was called.
But as it turns out, we don't care. We want to know if
"bitmap_git->have" was set up, which is done in prepare_bitmap_walk().
So there's no way[1] to get a bitmap_git that hasn't been properly set
up. This BUG() check can just go away.

I'll prepare a patch and some tests later tonight.

-Peff

[1] Actually, there is also prepare_bitmap_git(), but it is not really
    for general use by callers. It should be made static, or better yet,
    I suspect it can be folded into its callers.

  reply	other threads:[~2018-08-31 22:56 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-21 18:41 [PATCH] test-tool.h: include git-compat-util.h Jeff King
2018-08-21 19:03 ` Junio C Hamano
2018-08-21 19:06 ` [PATCH 1/6] t/perf: factor boilerplate out of test_perf Jeff King
2018-08-21 19:06 ` [PATCH 2/6] t/perf: factor out percent calculations Jeff King
2018-08-21 19:06 ` [PATCH 3/6] t/perf: add infrastructure for measuring sizes Jeff King
2018-08-22 13:40   ` Derrick Stolee
2018-08-22 15:31     ` Jeff King
2018-08-21 19:06 ` [PATCH 4/6] t/perf: add perf tests for fetches from a bitmapped server Jeff King
2018-08-21 19:07 ` [PATCH 5/6] pack-bitmap: save "have" bitmap from walk Jeff King
2018-08-21 19:47   ` Derrick Stolee
2018-08-21 19:54     ` Jeff King
2018-08-31 15:23   ` Ævar Arnfjörð Bjarmason
2018-08-31 22:55     ` Jeff King [this message]
2018-09-01  7:41       ` [PATCH 0/4] un-breaking pack-objects with bitmaps Jeff King
2018-09-01  7:44         ` [PATCH 1/4] bitmap_has_sha1_in_uninteresting(): drop BUG check Jeff King
2018-09-01  7:48         ` [PATCH 2/4] t5310: test delta reuse with bitmaps Jeff King
2018-09-01  8:03           ` Jeff King
2018-09-01 20:29             ` Ævar Arnfjörð Bjarmason
2018-09-01 22:46               ` Ben Peart
2018-09-02  5:51               ` Jeff King
2018-09-04 19:05             ` Stefan Beller
2018-09-04 19:45               ` Junio C Hamano
2018-09-04 20:02               ` Jeff King
2018-09-01  7:49         ` [PATCH 3/4] traverse_bitmap_commit_list(): don't free result Jeff King
2018-09-01  7:50         ` [PATCH 4/4] pack-bitmap: drop "loaded" flag Jeff King
2018-09-04 19:30         ` [PATCH 0/4] un-breaking pack-objects with bitmaps Stefan Beller
2018-09-04 20:03           ` Jeff King
2018-09-08  6:43         ` Ævar Arnfjörð Bjarmason
2018-09-10 16:53           ` Junio C Hamano
2018-09-10 18:48             ` Jeff King
2018-09-10 19:23               ` Junio C Hamano
2018-08-21 19:07 ` [PATCH 6/6] pack-objects: reuse on-disk deltas for thin "have" objects Jeff King
2018-08-21 19:43   ` Junio C Hamano
2018-08-21 19:50     ` Junio C Hamano
2018-08-21 20:07       ` Jeff King
2018-08-21 20:14         ` Jeff King
2018-08-21 20:52           ` Junio C Hamano
2018-08-21 21:30             ` Jeff King
2018-08-21 20:57         ` Junio C Hamano
2018-08-21 21:32           ` Jeff King
2018-08-23  0:43           ` [PATCH 0/9] trailer-parsing false positives Jeff King
2018-08-23  0:44             ` [PATCH 1/9] trailer: use size_t for string offsets Jeff King
2018-08-23  0:45             ` [PATCH 2/9] trailer: use size_t for iterating trailer list Jeff King
2018-08-23  0:46             ` [PATCH 3/9] trailer: pass process_trailer_opts to trailer_info_get() Jeff King
2018-08-23  0:48             ` [PATCH 4/9] interpret-trailers: tighten check for "---" patch boundary Jeff King
2018-08-23  0:49             ` [PATCH 5/9] interpret-trailers: allow suppressing "---" divider Jeff King
2018-08-23  0:50             ` [PATCH 6/9] pretty, ref-filter: format %(trailers) with no_divider option Jeff King
2018-08-23  0:50             ` [PATCH 7/9] sequencer: ignore "---" divider when parsing trailers Jeff King
2018-08-23  0:50             ` [PATCH 8/9] append_signoff: use size_t for string offsets Jeff King
2018-08-23  0:51             ` [PATCH 9/9] sequencer: handle ignore_footer when parsing trailers Jeff King
2018-08-23 18:30             ` [PATCH 0/9] trailer-parsing false positives Junio C Hamano
2018-08-24  7:26               ` Jeff King
2018-08-21 20:00     ` [PATCH 6/6] pack-objects: reuse on-disk deltas for thin "have" objects Jeff King
  -- strict thread matches above, loose matches on Subject: below --
2018-08-17 20:54 [PATCH 0/6] reuse on-disk deltas for fetches with bitmaps Jeff King
2018-08-17 20:59 ` [PATCH 5/6] pack-bitmap: save "have" bitmap from walk Jeff King
2018-08-17 22:39   ` Stefan Beller
2018-08-17 22:45     ` Jeff King
2014-03-26  7:22 [PATCH/RFC 0/6] reuse deltas found by bitmaps Jeff King
2014-03-26  7:23 ` [PATCH 5/6] pack-bitmap: save "have" bitmap from walk Jeff King

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