From 236f9aae165a5a12d117dea44d0a78de72fbbd46 Mon Sep 17 00:00:00 2001 From: compudj Date: Thu, 8 May 2008 01:16:57 +0000 Subject: [PATCH 1/1] update git-svn-id: http://ltt.polymtl.ca/svn@2896 04897980-b3bd-0310-b5e0-8ef037075253 --- tests/kernel/test-cmpxchg-nolock2.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/tests/kernel/test-cmpxchg-nolock2.c b/tests/kernel/test-cmpxchg-nolock2.c index c1bec897..52d1af85 100644 --- a/tests/kernel/test-cmpxchg-nolock2.c +++ b/tests/kernel/test-cmpxchg-nolock2.c @@ -131,6 +131,34 @@ static void do_test_disable_int(void) printk(KERN_ALERT "test end\n"); } +static void do_test_int(void) +{ + long flags; + unsigned int i; + cycles_t time1, time2, time; + long rem; + + local_irq_save(flags); + preempt_disable(); + time1 = get_cycles(); + for (i = 0; i < NR_LOOPS; i++) { + local_irq_restore(flags); + local_irq_save(flags); + } + time2 = get_cycles(); + local_irq_restore(flags); + preempt_enable(); + time = time2 - time1; + + printk(KERN_ALERT "test results: time for disabling/enabling interrupts (STI/CLI)\n"); + printk(KERN_ALERT "number of loops: %d\n", NR_LOOPS); + printk(KERN_ALERT "total time: %llu\n", time); + time = div_long_long_rem(time, NR_LOOPS, &rem); + printk(KERN_ALERT "-> enabling/disabling interrupts (STI/CLI) takes %llu cycles\n", + time); + printk(KERN_ALERT "test end\n"); +} + static int ltt_test_init(void) @@ -141,6 +169,7 @@ static int ltt_test_init(void) do_test_cmpxchg(); do_test_enable_int(); do_test_disable_int(); + do_test_int(); return -EAGAIN; /* Fail will directly unload the module */ } -- 2.34.1