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improved gettimeofday() timer resolution by maintaining acceptable load

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Fri Dec  2 00:16:59 2005  Tim Janik  <timj@imendio.com>

        * glib/gslice.c: improved gettimeofday() timer resolution by maintaining
        acceptable load distribution of the syscall.
        (slab_allocator_free_chunk): reduce minimum/single-thread magazine sizes
        to approximately page_size/2.5 to avoid excessive startup allocations.
This commit is contained in:
Tim Janik 2005-12-01 23:20:22 +00:00 committed by Tim Janik
parent a2f85d23ef
commit 2319431345
4 changed files with 24 additions and 3 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
Fri Dec 2 00:16:59 2005 Tim Janik <timj@imendio.com>
* glib/gslice.c: improved gettimeofday() timer resolution by maintaining
acceptable load distribution of the syscall.
(slab_allocator_free_chunk): reduce minimum/single-thread magazine sizes
to approximately page_size/2.5 to avoid excessive startup allocations.
2005-12-01 Matthias Clasen <mclasen@redhat.com>
* tests/gobject/ifacecheck.c (test_iface_base_init): Don't

7
ChangeLog.pre-2-10
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@ -1,3 +1,10 @@
Fri Dec 2 00:16:59 2005 Tim Janik <timj@imendio.com>
* glib/gslice.c: improved gettimeofday() timer resolution by maintaining
acceptable load distribution of the syscall.
(slab_allocator_free_chunk): reduce minimum/single-thread magazine sizes
to approximately page_size/2.5 to avoid excessive startup allocations.
2005-12-01 Matthias Clasen <mclasen@redhat.com>
* tests/gobject/ifacecheck.c (test_iface_base_init): Don't

7
ChangeLog.pre-2-12
View File

@ -1,3 +1,10 @@
Fri Dec 2 00:16:59 2005 Tim Janik <timj@imendio.com>
* glib/gslice.c: improved gettimeofday() timer resolution by maintaining
acceptable load distribution of the syscall.
(slab_allocator_free_chunk): reduce minimum/single-thread magazine sizes
to approximately page_size/2.5 to avoid excessive startup allocations.
2005-12-01 Matthias Clasen <mclasen@redhat.com>
* tests/gobject/ifacecheck.c (test_iface_base_init): Don't

6
glib/gslice.c
View File

@ -92,7 +92,7 @@
#define SLAB_INFO_SIZE P2ALIGN (sizeof (SlabInfo) + NATIVE_MALLOC_PADDING)
#define MAX_MAGAZINE_SIZE (256) /* see [3] and allocator_get_magazine_threshold() for this */
#define MIN_MAGAZINE_SIZE (4)
#define MAX_STAMP_COUNTER (13) /* distributes the load of gettimeofday() */
#define MAX_STAMP_COUNTER (7) /* distributes the load of gettimeofday() */
#define MAX_SLAB_CHUNK_SIZE(al) (((al)->max_page_size - SLAB_INFO_SIZE) / 8) /* we want at last 8 chunks per page, see [4] */
#define MAX_SLAB_INDEX(al) (SLAB_INDEX (al, MAX_SLAB_CHUNK_SIZE (al)) + 1)
#define SLAB_INDEX(al, asize) ((asize) / P2ALIGNMENT - 1) /* asize must be P2ALIGNMENT aligned */
@ -406,14 +406,14 @@ allocator_get_magazine_threshold (Allocator *allocator,
/* the magazine size calculated here has a lower bound of MIN_MAGAZINE_SIZE,
* which is required by the implementation. also, for moderately sized chunks
* (say >= 64 bytes), magazine sizes shouldn't be much smaller then the number
* of chunks available per page to avoid excessive traffic in the magazine
* of chunks available per page/2 to avoid excessive traffic in the magazine
* cache for small to medium sized structures.
* the upper bound of the magazine size is effectively provided by
* MAX_MAGAZINE_SIZE. for larger chunks, this number is scaled down so that
* the content of a single magazine doesn't exceed ca. 16KB.
*/
guint chunk_size = SLAB_CHUNK_SIZE (allocator, ix);
guint threshold = MAX (MIN_MAGAZINE_SIZE, sys_page_size / MAX (chunk_size, 64));
guint threshold = MAX (MIN_MAGAZINE_SIZE, allocator->max_page_size / MAX (5 * chunk_size, 5 * 32));
guint contention_counter = allocator->contention_counters[ix];
if (G_UNLIKELY (contention_counter)) /* single CPU bias */
{