swh:1:snp:32555a3fd8878f019c2ebd6c964bc1edcaeff337
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- v5.15-rc7
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- v5.15
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- v5.14-rc5
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- v5.13-rc7
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- v5.13
- v5.12-rc8
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- v5.12
- v5.11-rc7
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- v5.11-rc5
- v5.11-rc4
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- v5.11-rc2
- v5.11-rc1
- v5.11
- v5.10-rc7
- v5.10-rc6
- v5.10-rc5
- v5.10-rc4
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- v5.10-rc2
- v5.10-rc1
- v5.10
- v5.1-rc7
- v5.1-rc6
- v5.1-rc5
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- v5.1
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- v5.0-rc7
- v5.0-rc6
- v5.0-rc5
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- v5.0-rc3
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- v4.9
- v4.8-rc8
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- v4.8
- v4.7-rc7
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- v4.3
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- v4.2
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- v4.18-rc8
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- v4.18-rc6
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- v4.18
- v4.17-rc7
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- v4.17
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- v4.13-rc7
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- v4.13
- v4.12-rc7
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- v4.12
- v4.11-rc8
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- v4.11
- v4.10-rc8
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- v4.10
- v4.1-rc8
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- v4.1-rc5
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- v4.1
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- v4.0-rc5
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- v4.0-rc1
- v4.0
- v3.9-rc8
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- v3.9-rc6
- v3.9-rc5
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- v3.9
- v3.8-rc7
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- v3.8-rc5
- v3.8-rc4
- v3.8-rc3
- v3.8-rc2
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- v3.8
- v3.7-rc8
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- v3.7-rc5
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- v3.7-rc2
- v3.7-rc1
- v3.7
- v3.6-rc7
- v3.6-rc6
- v3.6-rc5
- v3.6-rc4
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- v3.6-rc2
- v3.6-rc1
- v3.6
- v3.5-rc7
- v3.5-rc6
- v3.5-rc5
- v3.5-rc4
- v3.5-rc3
- v3.5-rc2
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- v3.5
- v3.4-rc7
- v3.4-rc6
- v3.4-rc5
- v3.4-rc4
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- v3.3-rc7
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- v3.3
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- v3.2-rc6
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- v3.2-rc4
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- v2.6.38-rc1
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- v2.6.37-rc1
- v2.6.37
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- v2.6.36-rc2
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- v2.6.33
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- v2.6.31-rc8
- v2.6.31-rc7
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- v2.6.31-rc1
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- v2.6.30-rc8
- v2.6.30-rc7
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- v2.6.30-rc1
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- v2.6.29-rc7
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- v2.6.29-rc1
- v2.6.29
- v2.6.28-rc9
- v2.6.28-rc8
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- v2.6.27-rc9
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- v2.6.27
- v2.6.26-rc9
- v2.6.26-rc8
- v2.6.26-rc7
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- v2.6.26-rc5
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- v2.6.26
- v2.6.25-rc9
- v2.6.25-rc8
- v2.6.25-rc7
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- v2.6.25
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- v2.6.21-rc7
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- v2.6.21
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Tip revision: 319e2e3f63c348a9b66db4667efa73178e18b17d authored by Linus Torvalds on 15 December 2013, 20:31:33 UTC
Linux 3.13-rc4
Linux 3.13-rc4
Tip revision: 319e2e3
disable-tsc-on-off-stress-test.c
/*
* Tests for prctl(PR_GET_TSC, ...) / prctl(PR_SET_TSC, ...)
*
* Tests if the control register is updated correctly
* when set with prctl()
*
* Warning: this test will cause a very high load for a few seconds
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <inttypes.h>
#include <wait.h>
#include <sys/prctl.h>
#include <linux/prctl.h>
/* Get/set the process' ability to use the timestamp counter instruction */
#ifndef PR_GET_TSC
#define PR_GET_TSC 25
#define PR_SET_TSC 26
# define PR_TSC_ENABLE 1 /* allow the use of the timestamp counter */
# define PR_TSC_SIGSEGV 2 /* throw a SIGSEGV instead of reading the TSC */
#endif
/* snippet from wikipedia :-) */
uint64_t rdtsc() {
uint32_t lo, hi;
/* We cannot use "=A", since this would use %rax on x86_64 */
__asm__ __volatile__ ("rdtsc" : "=a" (lo), "=d" (hi));
return (uint64_t)hi << 32 | lo;
}
int should_segv = 0;
void sigsegv_cb(int sig)
{
if (!should_segv)
{
fprintf(stderr, "FATAL ERROR, rdtsc() failed while enabled\n");
exit(0);
}
if (prctl(PR_SET_TSC, PR_TSC_ENABLE) < 0)
{
perror("prctl");
exit(0);
}
should_segv = 0;
rdtsc();
}
void task(void)
{
signal(SIGSEGV, sigsegv_cb);
alarm(10);
for(;;)
{
rdtsc();
if (should_segv)
{
fprintf(stderr, "FATAL ERROR, rdtsc() succeeded while disabled\n");
exit(0);
}
if (prctl(PR_SET_TSC, PR_TSC_SIGSEGV) < 0)
{
perror("prctl");
exit(0);
}
should_segv = 1;
}
}
int main(int argc, char **argv)
{
int n_tasks = 100, i;
fprintf(stderr, "[No further output means we're allright]\n");
for (i=0; i<n_tasks; i++)
if (fork() == 0)
task();
for (i=0; i<n_tasks; i++)
wait(NULL);
exit(0);
}