The patch titled
slob: reduce list scanning
has been removed from the -mm tree. Its filename was
slob-reduce-list-scanning.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: slob: reduce list scanning
From: Matt Mackall <mpm@xxxxxxxxxxx>
The version of SLOB in -mm always scans its free list from the beginning,
which results in small allocations and free segments clustering at the
beginning of the list over time. This causes the average search to scan
over a large stretch at the beginning on each allocation.
By starting each page search where the last one left off, we evenly
distribute the allocations and greatly shorten the average search.
Without this patch, kernel compiles on a 1.5G machine take a large amount
of system time for list scanning. With this patch, compiles are within a
few seconds of performance of a SLAB kernel with no notable change in
system time.
Signed-off-by: Matt Mackall <mpm@xxxxxxxxxxx>
Cc: Christoph Lameter <clameter@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/slob.c | 21 ++++++++++++++++-----
1 file changed, 16 insertions(+), 5 deletions(-)
diff -puN mm/slob.c~slob-reduce-list-scanning mm/slob.c
--- a/mm/slob.c~slob-reduce-list-scanning
+++ a/mm/slob.c
@@ -293,6 +293,7 @@ static void *slob_page_alloc(struct slob
static void *slob_alloc(size_t size, gfp_t gfp, int align, int node)
{
struct slob_page *sp;
+ struct list_head *prev;
slob_t *b = NULL;
unsigned long flags;
@@ -307,12 +308,22 @@ static void *slob_alloc(size_t size, gfp
if (node != -1 && page_to_nid(&sp->page) != node)
continue;
#endif
+ /* Enough room on this page? */
+ if (sp->units < SLOB_UNITS(size))
+ continue;
- if (sp->units >= SLOB_UNITS(size)) {
- b = slob_page_alloc(sp, size, align);
- if (b)
- break;
- }
+ /* Attempt to alloc */
+ prev = sp->list.prev;
+ b = slob_page_alloc(sp, size, align);
+ if (!b)
+ continue;
+
+ /* Improve fragment distribution and reduce our average
+ * search time by starting our next search here. (see
+ * Knuth vol 1, sec 2.5, pg 449) */
+ if (free_slob_pages.next != prev->next)
+ list_move_tail(&free_slob_pages, prev->next);
+ break;
}
spin_unlock_irqrestore(&slob_lock, flags);
_
Patches currently in -mm which might be from mpm@xxxxxxxxxxx are
maps2-uninline-some-functions-in-the-page-walker.patch
maps2-eliminate-the-pmd_walker-struct-in-the-page-walker.patch
maps2-remove-vma-from-args-in-the-page-walker.patch
maps2-propagate-errors-from-callback-in-page-walker.patch
maps2-add-callbacks-for-each-level-to-page-walker.patch
maps2-move-the-page-walker-code-to-lib.patch
maps2-simplify-interdependence-of-proc-pid-maps-and-smaps.patch
maps2-move-clear_refs-code-to-task_mmuc.patch
maps2-regroup-task_mmu-by-interface.patch
maps2-make-proc-pid-smaps-optional-under-config_embedded.patch
maps2-make-proc-pid-clear_refs-option-under-config_embedded.patch
maps2-add-proc-pid-pagemap-interface.patch
maps2-add-proc-kpagemap-interface.patch
mmaps2-vma-out-of-mem_size_stats.patch
maps2-make-proc-pid-smaps-optional-under-config_embeddedpatch.patch
maps2-make-proc-pid-smaps-optional-under-config_embeddedpatch-fix.patch
hwrng-add-type-categories.patch
-
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