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block: compile out assert_bdrv_graph_readable() by default

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reader_count() is a performance bottleneck because the global
aio_context_list_lock mutex causes thread contention. Put this debugging
assertion behind a new ./configure --enable-debug-graph-lock option and
disable it by default.

The --enable-debug-graph-lock option is also enabled by the more general
--enable-debug option.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20230501173443.153062-1-stefanha@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2023-05-01 13:34:43 -04:00 • committed by Kevin Wolf
parent e19b157f3c
commit 58a2e3f5c3
5 changed files with 12 additions and 0 deletions
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1
configure vendored
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@ -816,6 +816,7 @@ for opt do
--enable-debug)
# Enable debugging options that aren't excessively noisy
debug_tcg="yes"
meson_option_parse --enable-debug-graph-lock ""
meson_option_parse --enable-debug-mutex ""
meson_option_add -Doptimization=0
fortify_source="no"