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Make 8-byte tiny size class non-optional.

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When tiny size class support was first added, it was intended to support
truly tiny size classes (even 2 bytes).  However, this wasn't very
useful in practice, so the minimum tiny size class has been limited to
sizeof(void *) for a long time now.  This is too small to be standards
compliant, but other commonly used malloc implementations do not even
bother using a 16-byte quantum  on systems with vector units (SSE2+,
AltiVEC, etc.).  As such, it is safe in practice to support an 8-byte
tiny size class on 64-bit systems that support 16-byte types.
This commit is contained in:
Jason Evans
2012-02-13 14:30:52 -08:00
parent 0fee70d718
commit ef8897b4b9
8 changed files with 44 additions and 145 deletions
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9
src/ctl.c
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@@ -56,7 +56,6 @@ CTL_PROTO(config_prof_libunwind)
CTL_PROTO(config_stats)
CTL_PROTO(config_sysv)
CTL_PROTO(config_tcache)
CTL_PROTO(config_tiny)
CTL_PROTO(config_tls)
CTL_PROTO(config_xmalloc)
CTL_PROTO(opt_abort)
@@ -199,7 +198,6 @@ static const ctl_node_t config_node[] = {
{NAME("stats"), CTL(config_stats)},
{NAME("sysv"), CTL(config_sysv)},
{NAME("tcache"), CTL(config_tcache)},
{NAME("tiny"), CTL(config_tiny)},
{NAME("tls"), CTL(config_tls)},
{NAME("xmalloc"), CTL(config_xmalloc)}
};
@@ -993,8 +991,6 @@ n##_ctl(const size_t *mib, size_t miblen, void *oldp, size_t *oldlenp, \
int ret; \
bool oldval; \
\
if (n == false) \
return (ENOENT); \
READONLY(); \
oldval = n; \
READ(oldval, bool); \
@@ -1115,7 +1111,6 @@ CTL_RO_BOOL_CONFIG_GEN(config_prof_libunwind)
CTL_RO_BOOL_CONFIG_GEN(config_stats)
CTL_RO_BOOL_CONFIG_GEN(config_sysv)
CTL_RO_BOOL_CONFIG_GEN(config_tcache)
CTL_RO_BOOL_CONFIG_GEN(config_tiny)
CTL_RO_BOOL_CONFIG_GEN(config_tls)
CTL_RO_BOOL_CONFIG_GEN(config_xmalloc)
@@ -1203,8 +1198,8 @@ CTL_RO_NL_GEN(arenas_cacheline, CACHELINE, size_t)
CTL_RO_NL_GEN(arenas_subpage, SUBPAGE, size_t)
CTL_RO_NL_GEN(arenas_pagesize, PAGE_SIZE, size_t)
CTL_RO_NL_GEN(arenas_chunksize, chunksize, size_t)
CTL_RO_NL_CGEN(config_tiny, arenas_tspace_min, (1U << LG_TINY_MIN), size_t)
CTL_RO_NL_CGEN(config_tiny, arenas_tspace_max, (qspace_min >> 1), size_t)
CTL_RO_NL_GEN(arenas_tspace_min, TINY_MIN, size_t)
CTL_RO_NL_GEN(arenas_tspace_max, (qspace_min >> 1), size_t)
CTL_RO_NL_GEN(arenas_qspace_min, qspace_min, size_t)
CTL_RO_NL_GEN(arenas_qspace_max, qspace_max, size_t)
CTL_RO_NL_GEN(arenas_cspace_min, cspace_min, size_t)