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Simplify tcache object caching.

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Use chains of cached objects, rather than using arrays of pointers.

Since tcache_bin_t is no longer dynamically sized, convert tcache_t's
tbin to an array of structures, rather than an array of pointers.  This
implicitly removes tcache_bin_{create,destroy}(), which further
simplifies the fast path for malloc/free.

Use cacheline alignment for tcache_t allocations.

Remove runtime configuration option for number of tcache bin slots, and
replace it with a boolean option for enabling/disabling tcache.

Limit the number of tcache objects to the lesser of TCACHE_NSLOTS_MAX
and 2X the number of regions per run for the size class.

For GC-triggered flush, discard 3/4 of the objects below the low water
mark, rather than 1/2.
This commit is contained in:
Jason Evans
2010-03-07 15:34:14 -08:00
parent 2caa4715ed
commit 3fa9a2fad8
8 changed files with 171 additions and 246 deletions
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11
jemalloc/doc/jemalloc.3.in
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@@ -376,8 +376,7 @@ will disable dirty page purging.
@roff_tcache@.Ev JEMALLOC_OPTIONS=14g
@roff_tcache@will disable garbage collection.
@roff_tcache@.It H
@roff_tcache@Double/halve the number of thread-specific cache slots per size
@roff_tcache@class.
@roff_tcache@Enable/disable thread-specific caching.
@roff_tcache@When there are multiple threads, each thread uses a
@roff_tcache@thread-specific cache for small and medium objects.
@roff_tcache@Thread-specific caching allows many allocations to be satisfied
@@ -386,11 +385,7 @@ will disable dirty page purging.
@roff_tcache@See the
@roff_tcache@.Dq G
@roff_tcache@option for related tuning information.
@roff_tcache@The default number of cache slots is 128;
@roff_tcache@.Ev JEMALLOC_OPTIONS=7h
@roff_tcache@will disable thread-specific caching.
@roff_tcache@Note that one cache slot per size class is not a valid
@roff_tcache@configuration due to implementation details.
@roff_tcache@This option is enabled by default.
@roff_prof@.It I
@roff_prof@Double/halve the average interval between memory profile dumps, as
@roff_prof@measured in bytes of allocation activity.
@@ -773,7 +768,7 @@ option.
@roff_xmalloc@option.
@roff_xmalloc@.Ed
.\"-----------------------------------------------------------------------------
@roff_tcache@.It Sy "opt.lg_tcache_nslots (size_t) r-"
@roff_tcache@.It Sy "opt.tcache (bool) r-"
@roff_tcache@.Bd -ragged -offset indent -compact
@roff_tcache@See the
@roff_tcache@.Dq H