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Subject[PATCH] mm/slab.c, kernel <2.4.20>
/**
* --readme--
* make a better initial value for i, which will
reduce the number of
while loop.
* the change can be proved mathematically:
*
* i*size + L1_CACHE_ALIGN(base+i*extra) <= wastage
* ==> i*size + base + i*extra <= wastage
* ==> solve about equation about i
* ==> i <= (wastage - base) / (size + extra)
*
* Chen Shang
* shangcs@yahoo.com
*/

--- slab.c 2003-02-08 04:26:50.000000000 -0500
+++ slab.c 2003-02-08 04:26:14.000000000 -0500
@@ -397,7 +397,7 @@
base = sizeof(slab_t);
extra = sizeof(kmem_bufctl_t);
}
- i = 0;
+ i = (wastage - base) / (size + extra);
while (i*size + L1_CACHE_ALIGN(base+i*extra) <=
wastage)
i++;
if (i > 0)
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