[2.6 PATCH] SLAB : removes local_irq_save()/local_irq_restore() pair in ksize()

This patch removes unnecessary critical section in ksize() function, as cli/sti are rather expensive on modern CPUS.


Signed-off-by: Eric Dumazet <[email protected]>

diff -Nru linux-2.6.13-rc6-ed/mm/slab.c linux-2.6.13-rc6/mm/slab.c
--- linux-2.6.13-rc6-ed/mm/slab.c	2005-08-20 09:22:29.000000000 +0200
+++ linux-2.6.13-rc6/mm/slab.c	2005-08-20 09:39:42.000000000 +0200
@@ -3080,10 +3080,8 @@
 	unsigned int size = 0;
 
 	if (likely(objp != NULL)) {
-		local_irq_save(flags);
 		c = GET_PAGE_CACHE(virt_to_page(objp));
 		size = kmem_cache_size(c);
-		local_irq_restore(flags);
 	}
 
 	return size;

---

• References:
  • [RFC: 2.6 patch] remove the second arg of do_timer_interrupt()
    • From: Adrian Bunk <[email protected]>

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