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Better document --enable-ivsalloc.

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This commit is contained in:
Jason Evans 2016-06-01 13:14:18 -07:00
parent 22588dda6e
commit 03eea4fb8b
3 changed files with 14 additions and 6 deletions
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11
include/jemalloc/internal/jemalloc_internal.h.in
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@ -1061,12 +1061,19 @@ ivsalloc(tsdn_t *tsdn, const void *ptr)
{
extent_t *extent;
/* Return 0 if ptr is not within a chunk managed by jemalloc. */
/*
* Return 0 if ptr is not within an extent managed by jemalloc. This
* function has two extra costs relative to isalloc():
* - The extent_lookup() call cannot claim to be a dependent lookup,
* which induces rtree lookup load dependencies.
* - The lookup may fail, so there is an extra branch to check for
* failure.
* */
extent = extent_lookup(tsdn, ptr, false);
if (extent == NULL)
return (0);
assert(extent_active_get(extent));
/* Only arena chunks should be looked up via interior pointers. */
/* Only slab members should be looked up via interior pointers. */
assert(extent_addr_get(extent) == ptr || extent_slab_get(extent));
return (isalloc(tsdn, extent, ptr));

2
include/jemalloc/internal/jemalloc_internal_defs.h.in
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@ -195,7 +195,7 @@
/*
* JEMALLOC_IVSALLOC enables ivsalloc(), which verifies that pointers reside
* within jemalloc-owned chunks before dereferencing them.
* within jemalloc-owned extents before dereferencing them.
*/
#undef JEMALLOC_IVSALLOC