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Add glibc.malloc.mxfast tunable

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* elf/dl-tunables.list: Add glibc.malloc.mxfast.
* manual/tunables.texi: Document it.
* malloc/malloc.c (do_set_mxfast): New.
(__libc_mallopt): Call it.
* malloc/arena.c: Add mxfast tunable.
* malloc/tst-mxfast.c: New.
* malloc/Makefile: Add it.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
DJ Delorie
2019-08-08 19:09:43 -04:00
parent b6d2c4475d
commit c48d92b430
7 changed files with 96 additions and 7 deletions
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2
malloc/arena.c
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@ -236,6 +236,7 @@ TUNABLE_CALLBACK_FNDECL (set_tcache_max, size_t)
TUNABLE_CALLBACK_FNDECL (set_tcache_count, size_t)
TUNABLE_CALLBACK_FNDECL (set_tcache_unsorted_limit, size_t)
#endif
TUNABLE_CALLBACK_FNDECL (set_mxfast, size_t)
#else
/* Initialization routine. */
#include <string.h>
@ -323,6 +324,7 @@ ptmalloc_init (void)
TUNABLE_GET (tcache_unsorted_limit, size_t,
TUNABLE_CALLBACK (set_tcache_unsorted_limit));
# endif
TUNABLE_GET (mxfast, size_t, TUNABLE_CALLBACK (set_mxfast));
#else
const char *s = NULL;
if (__glibc_likely (_environ != NULL))