Commit d6269543 authored by Matt Mackall's avatar Matt Mackall Committed by Linus Torvalds

slob: reduce list scanning

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: default avatarMatt Mackall <mpm@selenic.com>
Cc: Christoph Lameter <clameter@sgi.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 41f9dc5c
......@@ -293,6 +293,7 @@ static void *slob_page_alloc(struct slob_page *sp, size_t size, int align)
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;
......@@ -307,13 +308,23 @@ static void *slob_alloc(size_t size, gfp_t gfp, int align, int node)
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)) {
/* Attempt to alloc */
prev = sp->list.prev;
b = slob_page_alloc(sp, size, align);
if (b)
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);
/* Not enough space: must allocate a new page */
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment