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author | jasone <jasone@FreeBSD.org> | 2008-08-27 02:00:53 +0000 |
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committer | jasone <jasone@FreeBSD.org> | 2008-08-27 02:00:53 +0000 |
commit | a734052e9cc1d5fcb1f68103dcaf5e4c9324994d (patch) | |
tree | 0e5399c773ca24c377f8a89207f8b7bf90716b12 /lib/libc/include/libc_private.h | |
parent | cad1568d07cb3426f863ebdd3ef86f0befecc497 (diff) | |
download | FreeBSD-src-a734052e9cc1d5fcb1f68103dcaf5e4c9324994d.zip FreeBSD-src-a734052e9cc1d5fcb1f68103dcaf5e4c9324994d.tar.gz |
Add thread-specific caching for small size classes, based on magazines.
This caching allows for completely lock-free allocation/deallocation in the
steady state, at the expense of likely increased memory use and
fragmentation.
Reduce the default number of arenas to 2*ncpus, since thread-specific
caching typically reduces arena contention.
Modify size class spacing to include ranges of 2^n-spaced, quantum-spaced,
cacheline-spaced, and subpage-spaced size classes. The advantages are:
fewer size classes, reduced false cacheline sharing, and reduced internal
fragmentation for allocations that are slightly over 512, 1024, etc.
Increase RUN_MAX_SMALL, in order to limit fragmentation for the
subpage-spaced size classes.
Add a size-->bin lookup table for small sizes to simplify translating sizes
to size classes. Include a hard-coded constant table that is used unless
custom size class spacing is specified at run time.
Add the ability to disable tiny size classes at compile time via
MALLOC_TINY.
Diffstat (limited to 'lib/libc/include/libc_private.h')
-rw-r--r-- | lib/libc/include/libc_private.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/libc/include/libc_private.h b/lib/libc/include/libc_private.h index 70e1ef8..50903f3 100644 --- a/lib/libc/include/libc_private.h +++ b/lib/libc/include/libc_private.h @@ -158,6 +158,12 @@ void _set_tp(void *tp); extern const char *__progname; /* + * This function is used by the threading libraries to notify malloc that a + * thread is exiting. + */ +void _malloc_thread_cleanup(void); + +/* * These functions are used by the threading libraries in order to protect * malloc across fork(). */ |