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Allocate quarks in chunks to avoid overhead and fragmentation

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See bug 616720 for some measurements.
This commit is contained in:
Alexander Larsson 2010-04-27 09:23:07 +02:00
parent 3ceddd74bb
commit 270a954b54
1 changed files with 34 additions and 2 deletions
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36
glib/gdataset.c
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@ -1004,6 +1004,38 @@ g_quark_try_string (const gchar *string)
return quark;
}
#define QUARK_STRING_BLOCK_SIZE (4096 - sizeof (gsize))
static char *quark_block = NULL;
static int quark_block_offset = 0;
/* HOLDS: g_quark_global_lock */
static char *
quark_strdup(const gchar *string)
{
gchar *copy;
gsize len;
len = strlen (string) + 1;
/* For strings longer than half the block size, fall back
to strdup so that we fill our blocks at least 50%. */
if (len > QUARK_STRING_BLOCK_SIZE / 2)
return g_strdup (string);
if (quark_block == NULL ||
QUARK_STRING_BLOCK_SIZE - quark_block_offset < len)
{
quark_block = g_malloc (QUARK_STRING_BLOCK_SIZE);
quark_block_offset = 0;
}
copy = quark_block + quark_block_offset;
memcpy (copy, string, len);
quark_block_offset += len;
return copy;
}
/* HOLDS: g_quark_global_lock */
static inline GQuark
g_quark_from_string_internal (const gchar *string,
@ -1015,8 +1047,8 @@ g_quark_from_string_internal (const gchar *string,
quark = GPOINTER_TO_UINT (g_hash_table_lookup (g_quark_ht, string));
if (!quark)
quark = g_quark_new (duplicate ? g_strdup (string) : (gchar *)string);
quark = g_quark_new (duplicate ? quark_strdup (string) : (gchar *)string);
return quark;
}