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27fc6f565d
The purpose of this workload is to gather samples in an inlined
function. This can be used to test whether inlined addr2line works
correctly.
Committer testing:
$ perf record perf test -w inlineloop 1
[ perf record: Woken up 2 times to write data ]
[ perf record: Captured and wrote 0.161 MB perf.data (4005 samples) ]
$ perf report --stdio --dso perf -s srcfile,srcline
#
# Total Lost Samples: 0
#
# Samples: 4K of event 'cpu/cycles/Pu'
# Event count (approx.): 5535180842
#
# Overhead Source File Source:Line
# ........ ............ ...............
#
99.04% inlineloop.c inlineloop.c:21
0.46% inlineloop.c inlineloop.c:20
#
$
Reviewed-by: James Clark <james.clark@linaro.org>
Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Howard Chu <howardchu95@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephen Brennan <stephen.s.brennan@oracle.com>
Cc: Tony Jones <tonyj@suse.de>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
53 lines
824 B
C
53 lines
824 B
C
// SPDX-License-Identifier: GPL-2.0
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#include <pthread.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <unistd.h>
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#include <linux/compiler.h>
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#include "../tests.h"
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static volatile int a;
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static volatile sig_atomic_t done;
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static void sighandler(int sig __maybe_unused)
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{
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done = 1;
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}
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static inline void __attribute__((always_inline)) leaf(int b)
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{
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again:
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a += b;
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if (!done)
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goto again;
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}
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static inline void __attribute__((always_inline)) middle(int b)
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{
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leaf(b);
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}
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static noinline void parent(int b)
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{
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middle(b);
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}
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static int inlineloop(int argc, const char **argv)
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{
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int sec = 1;
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pthread_setname_np(pthread_self(), "perf-inlineloop");
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if (argc > 0)
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sec = atoi(argv[0]);
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signal(SIGINT, sighandler);
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signal(SIGALRM, sighandler);
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alarm(sec);
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parent(sec);
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return 0;
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}
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DEFINE_WORKLOAD(inlineloop);
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