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Commit 56a51991 authored by Jim Kukunas's avatar Jim Kukunas Committed by NeilBrown
Browse files

crypto: disable preemption while benchmarking RAID5 xor checksumming 



With CONFIG_PREEMPT=y, we need to disable preemption while benchmarking
RAID5 xor checksumming to ensure we're actually measuring what we think
we're measuring.

Signed-off-by: default avatarJim Kukunas <james.t.kukunas@linux.intel.com>
Signed-off-by: default avatarNeilBrown <neilb@suse.de>
parent 6a328475

crypto/xor.c

+5 −0
Original line number Original line Diff line number Diff line
@@ -21,6 +21,7 @@ 
#include <linux/gfp.h>

#include <linux/gfp.h>

#include <linux/raid/xor.h>

#include <linux/raid/xor.h>

#include <linux/jiffies.h>

#include <linux/jiffies.h>

#include <linux/preempt.h>

#include <asm/xor.h>

#include <asm/xor.h>





/* The xor routines to use.  */

/* The xor routines to use.  */
@@ -69,6 +70,8 @@ do_xor_speed(struct xor_block_template *tmpl, void *b1, void *b2) 
	tmpl->next = template_list;

	tmpl->next = template_list;

	template_list = tmpl;

	template_list = tmpl;





	preempt_disable();



	/*

	/*

	 * Count the number of XORs done during a whole jiffy, and use

	 * Count the number of XORs done during a whole jiffy, and use

	 * this to calculate the speed of checksumming.  We use a 2-page

	 * this to calculate the speed of checksumming.  We use a 2-page
@@ -91,6 +94,8 @@ do_xor_speed(struct xor_block_template *tmpl, void *b1, void *b2) 
			max = count;

			max = count;

	}

	}





	preempt_enable();



	speed = max * (HZ * BENCH_SIZE / 1024);

	speed = max * (HZ * BENCH_SIZE / 1024);

	tmpl->speed = speed;

	tmpl->speed = speed;