41 lines
1.4 KiB
Diff
41 lines
1.4 KiB
Diff
* malloc/arena.c (arena_get2): Avoid unnecessarily
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retrieving #cpus from /proc.
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* malloc/malloc.c (mALLOPt): Clamp arena_test based on
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the value of arena_max.
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commit 41b81892f11fe1353123e892158b53de73863d62
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Author: Ulrich Drepper <drepper@gmail.com>
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Date: Tue Jan 31 14:42:34 2012 -0500
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Handle ARENA_TEST correctly
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diff --git a/malloc/arena.c b/malloc/arena.c
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index d3cf4b9..b1c9469 100644
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--- a/malloc/arena.c
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+++ b/malloc/arena.c
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@@ -828,7 +828,7 @@ arena_get2(mstate a_tsd, size_t size)
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{
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if (mp_.arena_max != 0)
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narenas_limit = mp_.arena_max;
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- else
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+ else if (narenas > mp_.arena_test)
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{
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int n = __get_nprocs ();
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@@ -842,7 +842,14 @@ arena_get2(mstate a_tsd, size_t size)
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}
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repeat:;
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size_t n = narenas;
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- if (__builtin_expect (n <= mp_.arena_test || n < narenas_limit, 0))
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+ /* NB: the following depends on the fact that (size_t)0 - 1 is a
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+ very large number and that the underflow is OK. If arena_max
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+ is set the value of arena_test is irrelevant. If arena_test
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+ is set but narenas is not yet larger or equal to arena_test
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+ narenas_limit is 0. There is no possibility for narenas to
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+ be too big for the test to always fail since there is not
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+ enough address space to create that many arenas. */
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+ if (__builtin_expect (n <= narenas_limit - 1, 0))
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{
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if (catomic_compare_and_exchange_bool_acq (&narenas, n + 1, n))
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goto repeat;
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