[PATCH] Use 32 bit division in slab_put_obj()

Improve the performance of slab_put_obj().  Without the cast, gcc considers
ptrdiff_t a 64 bit signed integer and ends up emitting code to use a full
signed 128 bit divide on EM64T, which is substantially slower than a 32 bit
unsigned divide.

I noticed this when looking at the profile of a case where the slab balance
is just on edge and thrashes back and forth freeing a block.

Signed-off-by: Benjamin LaHaise <benjamin.c.lahaise@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/mm/slab.c b/mm/slab.c
index 6f8495e..88082ae 100644 (file)
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1398,7 +1398,7 @@ static void check_poison_obj(kmem_cache_t *cachep, void *objp)
                struct slab *slabp = page_get_slab(virt_to_page(objp));
                int objnr;
 
-               objnr = (objp - slabp->s_mem) / cachep->objsize;
+               objnr = (unsigned)(objp - slabp->s_mem) / cachep->objsize;
                if (objnr) {
                        objp = slabp->s_mem + (objnr - 1) * cachep->objsize;
                        realobj = (char *)objp + obj_dbghead(cachep);
@@ -2341,7 +2341,7 @@ static void *cache_free_debugcheck(kmem_cache_t *cachep, void *objp,
        if (cachep->flags & SLAB_STORE_USER)
                *dbg_userword(cachep, objp) = caller;
 
-       objnr = (objp - slabp->s_mem) / cachep->objsize;
+       objnr = (unsigned)(objp - slabp->s_mem) / cachep->objsize;
 
        BUG_ON(objnr >= cachep->num);
        BUG_ON(objp != slabp->s_mem + objnr * cachep->objsize);
@@ -2699,7 +2699,7 @@ static void free_block(kmem_cache_t *cachep, void **objpp, int nr_objects,
                slabp = page_get_slab(virt_to_page(objp));
                l3 = cachep->nodelists[node];
                list_del(&slabp->list);
-               objnr = (objp - slabp->s_mem) / cachep->objsize;
+               objnr = (unsigned)(objp - slabp->s_mem) / cachep->objsize;
                check_spinlock_acquired_node(cachep, node);
                check_slabp(cachep, slabp);