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radix tree test suite: track preempt_count 

Rather than simply NOP out preempt_enable() and preempt_disable(), keep
track of preempt_count and display it regularly in case either the test
suite or the code under test is forgetting to balance the enables &
disables.  Only found a test-case that was forgetting to re-enable
preemption, but it's a possibility worth checking.

Link: http://lkml.kernel.org/r/1480369871-5271-39-git-send-email-mawilcox@linuxonhyperv.com
Signed-off-by: Matthew Wilcox <willy@infradead.org>
Tested-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Konstantin Khlebnikov <koct9i@gmail.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Matthew Wilcox <mawilcox@microsoft.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Wilcox 2016-12-14 15:08:02 -08:00 committed by Linus Torvalds
parent 31023cd664
commit 847d357635
3 changed files with 24 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
tools/testing/radix-tree/linux.c
View File

@ -9,6 +9,7 @@
#include <urcu/uatomic.h>
int nr_allocated;
int preempt_count;
void *mempool_alloc(mempool_t *pool, int gfp_mask)
{

6
tools/testing/radix-tree/linux/preempt.h
View File

@ -1,4 +1,4 @@
/* */
extern int preempt_count;
#define preempt_disable() do { } while (0)
#define preempt_enable() do { } while (0)
#define preempt_disable() uatomic_inc(&preempt_count)
#define preempt_enable() uatomic_dec(&preempt_count)

30
tools/testing/radix-tree/main.c
View File

@ -293,27 +293,36 @@ static void single_thread_tests(bool long_run)
{
int i;
printf("starting single_thread_tests: %d allocated\n", nr_allocated);
printf("starting single_thread_tests: %d allocated, preempt %d\n",
nr_allocated, preempt_count);
multiorder_checks();
printf("after multiorder_check: %d allocated\n", nr_allocated);
printf("after multiorder_check: %d allocated, preempt %d\n",
nr_allocated, preempt_count);
locate_check();
printf("after locate_check: %d allocated\n", nr_allocated);
printf("after locate_check: %d allocated, preempt %d\n",
nr_allocated, preempt_count);
tag_check();
printf("after tag_check: %d allocated\n", nr_allocated);
printf("after tag_check: %d allocated, preempt %d\n",
nr_allocated, preempt_count);
gang_check();
printf("after gang_check: %d allocated\n", nr_allocated);
printf("after gang_check: %d allocated, preempt %d\n",
nr_allocated, preempt_count);
add_and_check();
printf("after add_and_check: %d allocated\n", nr_allocated);
printf("after add_and_check: %d allocated, preempt %d\n",
nr_allocated, preempt_count);
dynamic_height_check();
printf("after dynamic_height_check: %d allocated\n", nr_allocated);
printf("after dynamic_height_check: %d allocated, preempt %d\n",
nr_allocated, preempt_count);
big_gang_check(long_run);
printf("after big_gang_check: %d allocated\n", nr_allocated);
printf("after big_gang_check: %d allocated, preempt %d\n",
nr_allocated, preempt_count);
for (i = 0; i < (long_run ? 2000 : 3); i++) {
copy_tag_check();
printf("%d ", i);
fflush(stdout);
}
printf("after copy_tag_check: %d allocated\n", nr_allocated);
printf("after copy_tag_check: %d allocated, preempt %d\n",
nr_allocated, preempt_count);
}
int main(int argc, char **argv)
@ -336,7 +345,8 @@ int main(int argc, char **argv)
single_thread_tests(long_run);
sleep(1);
printf("after sleep(1): %d allocated\n", nr_allocated);
printf("after sleep(1): %d allocated, preempt %d\n",
nr_allocated, preempt_count);
rcu_unregister_thread();
exit(0);