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| author | Jim Kukunas <james.t.kukunas@linux.intel.com> | 2012-05-22 13:54:03 +1000 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2012-05-22 13:54:03 +1000 |
| commit | 6a328475cccacb99a13b06978091da936dd51d89 (patch) | |
| tree | f4fc193b5ec71f7c7dfc0a33341d80a2c103c205 /crypto | |
| parent | 3ea7daa5d7fde47cd41f4d56c2deb949114da9d6 (diff) | |
| download | linux-6a328475cccacb99a13b06978091da936dd51d89.tar.bz2 | |
crypto: wait for a full jiffy in do_xor_speed
In the existing do_xor_speed(), there is no guarantee that we actually
run do_2() for a full jiffy. We get the current jiffy, then run do_2()
until the next jiffy.
Instead, let's get the current jiffy, then wait until the next jiffy
to start our test.
Signed-off-by: Jim Kukunas <james.t.kukunas@linux.intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'crypto')
| -rw-r--r-- | crypto/xor.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/crypto/xor.c b/crypto/xor.c index b75182d8ab14..87884435bddb 100644 --- a/crypto/xor.c +++ b/crypto/xor.c @@ -63,7 +63,7 @@ static void do_xor_speed(struct xor_block_template *tmpl, void *b1, void *b2) { int speed; - unsigned long now; + unsigned long now, j; int i, count, max; tmpl->next = template_list; @@ -76,9 +76,11 @@ do_xor_speed(struct xor_block_template *tmpl, void *b1, void *b2) */ max = 0; for (i = 0; i < 5; i++) { - now = jiffies; + j = jiffies; count = 0; - while (jiffies == now) { + while ((now = jiffies) == j) + cpu_relax(); + while (time_before(jiffies, now + 1)) { mb(); /* prevent loop optimzation */ tmpl->do_2(BENCH_SIZE, b1, b2); mb(); |