diff options
| -rw-r--r-- | mm/slob.c | 21 |
1 files changed, 16 insertions, 5 deletions
diff --git a/mm/slob.c b/mm/slob.c index d50920ecc02b..ec33fcdc852e 100644 --- a/mm/slob.c +++ b/mm/slob.c @@ -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; @@ -307,12 +308,22 @@ 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)) { - 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); |