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In 9ac3f0e5b3 (pack-objects: fix performance issues on packing large
deltas, 2018-07-22), a mutex was introduced that is used to guard the
call to set the delta size. This commit even added code to initialize
it, but at an incorrect spot: in `init_threaded_search()`, while the
call to `oe_set_delta_size()` (and hence to `packing_data_lock()`) can
happen in the call chain `check_object()` <- `get_object_details()` <-
`prepare_pack()` <- `cmd_pack_objects()`, which is long before the
`prepare_pack()` function calls `ll_find_deltas()` (which initializes
the threaded search).
Another tell-tale that the mutex was initialized in an incorrect spot is
that the function to initialize it lives in builtin/, while the code
that uses the mutex is defined in a libgit.a header file.
Let's use a more appropriate function: `prepare_packing_data()`, which
not only lives in libgit.a, but *has* to be called before the
`packing_data` struct is used that contains that mutex.
This fixes https://github.com/git-for-windows/git/issues/1839.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
32 lines
624 B
Bash
Executable file
32 lines
624 B
Bash
Executable file
#!/bin/sh
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#
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# Copyright (c) 2018 Johannes Schindelin
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#
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test_description='git pack-object with "large" deltas
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'
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. ./test-lib.sh
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. "$TEST_DIRECTORY"/lib-pack.sh
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# Two similar-ish objects that we have computed deltas between.
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A=01d7713666f4de822776c7622c10f1b07de280dc
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B=e68fe8129b546b101aee9510c5328e7f21ca1d18
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test_expect_success 'setup' '
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clear_packs &&
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{
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pack_header 2 &&
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pack_obj $A $B &&
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pack_obj $B
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} >ab.pack &&
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pack_trailer ab.pack &&
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git index-pack --stdin <ab.pack
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'
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test_expect_success 'repack large deltas' '
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printf "%s\\n" $A $B |
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GIT_TEST_OE_DELTA_SIZE=2 git pack-objects tmp-pack
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'
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test_done
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