mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
synced 2026-10-29 21:33:00 +01:00
Namhyung Kim
a104f0ea99
The brstack is to run different kinds of branches repeatedly. This is necessary for brstack test case to verify if it has correct branch info. $ perf test -w brstack I renamed the internal functions to have brstack_ prefix as it's too generic name. Add a -U_FORTIFY_SOURCE to the brstack CFLAGS, as the main perf flags set it and it requires building with optimization, and this new test has a -O0. Signed-off-by: Namhyung Kim <[email protected]> Cc: Adrian Hunter <[email protected]> Cc: Athira Jajeev <[email protected]> Cc: German Gomez <[email protected]> Cc: Ian Rogers <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: James Clark <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Leo Yan <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Zhengjun Xing <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
41 lines
751 B
C
41 lines
751 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#include <stdlib.h>
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#include "../tests.h"
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#define BENCH_RUNS 999999
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static volatile int cnt;
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static void brstack_bar(void) {
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} /* return */
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static void brstack_foo(void) {
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brstack_bar(); /* call */
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} /* return */
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static void brstack_bench(void) {
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void (*brstack_foo_ind)(void) = brstack_foo;
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if ((cnt++) % 3) /* branch (cond) */
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brstack_foo(); /* call */
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brstack_bar(); /* call */
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brstack_foo_ind(); /* call (ind) */
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}
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static int brstack(int argc, const char **argv)
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{
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int num_loops = BENCH_RUNS;
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if (argc > 0)
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num_loops = atoi(argv[0]);
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while (1) {
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if ((cnt++) > num_loops)
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break;
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brstack_bench();/* call */
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} /* branch (uncond) */
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return 0;
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}
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DEFINE_WORKLOAD(brstack);
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