diff options
Diffstat (limited to 'Documentation/prctl')
| -rw-r--r-- | Documentation/prctl/.gitignore | 3 | ||||
| -rw-r--r-- | Documentation/prctl/Makefile | 10 | ||||
| -rw-r--r-- | Documentation/prctl/disable-tsc-ctxt-sw-stress-test.c | 97 | ||||
| -rw-r--r-- | Documentation/prctl/disable-tsc-on-off-stress-test.c | 96 | ||||
| -rw-r--r-- | Documentation/prctl/disable-tsc-test.c | 95 |
5 files changed, 0 insertions, 301 deletions
diff --git a/Documentation/prctl/.gitignore b/Documentation/prctl/.gitignore deleted file mode 100644 index 0b5c274..0000000 --- a/Documentation/prctl/.gitignore +++ /dev/null @@ -1,3 +0,0 @@ -disable-tsc-ctxt-sw-stress-test -disable-tsc-on-off-stress-test -disable-tsc-test diff --git a/Documentation/prctl/Makefile b/Documentation/prctl/Makefile deleted file mode 100644 index 44de308..0000000 --- a/Documentation/prctl/Makefile +++ /dev/null @@ -1,10 +0,0 @@ -ifndef CROSS_COMPILE -# List of programs to build -hostprogs-$(CONFIG_X86) := disable-tsc-ctxt-sw-stress-test disable-tsc-on-off-stress-test disable-tsc-test -# Tell kbuild to always build the programs -always := $(hostprogs-y) - -HOSTCFLAGS_disable-tsc-ctxt-sw-stress-test.o += -I$(objtree)/usr/include -HOSTCFLAGS_disable-tsc-on-off-stress-test.o += -I$(objtree)/usr/include -HOSTCFLAGS_disable-tsc-test.o += -I$(objtree)/usr/include -endif diff --git a/Documentation/prctl/disable-tsc-ctxt-sw-stress-test.c b/Documentation/prctl/disable-tsc-ctxt-sw-stress-test.c deleted file mode 100644 index f7499d1..0000000 --- a/Documentation/prctl/disable-tsc-ctxt-sw-stress-test.c +++ /dev/null @@ -1,97 +0,0 @@ -/* - * Tests for prctl(PR_GET_TSC, ...) / prctl(PR_SET_TSC, ...) - * - * Tests if the control register is updated correctly - * at context switches - * - * 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 - -static uint64_t rdtsc(void) -{ -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; -} - -static void sigsegv_expect(int sig) -{ - /* */ -} - -static void segvtask(void) -{ - if (prctl(PR_SET_TSC, PR_TSC_SIGSEGV) < 0) - { - perror("prctl"); - exit(0); - } - signal(SIGSEGV, sigsegv_expect); - alarm(10); - rdtsc(); - fprintf(stderr, "FATAL ERROR, rdtsc() succeeded while disabled\n"); - exit(0); -} - - -static void sigsegv_fail(int sig) -{ - fprintf(stderr, "FATAL ERROR, rdtsc() failed while enabled\n"); - exit(0); -} - -static void rdtsctask(void) -{ - if (prctl(PR_SET_TSC, PR_TSC_ENABLE) < 0) - { - perror("prctl"); - exit(0); - } - signal(SIGSEGV, sigsegv_fail); - alarm(10); - for(;;) rdtsc(); -} - - -int main(void) -{ - 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) - { - if (i & 1) - segvtask(); - else - rdtsctask(); - } - - for (i=0; i<n_tasks; i++) - wait(NULL); - - exit(0); -} - diff --git a/Documentation/prctl/disable-tsc-on-off-stress-test.c b/Documentation/prctl/disable-tsc-on-off-stress-test.c deleted file mode 100644 index a06f027..0000000 --- a/Documentation/prctl/disable-tsc-on-off-stress-test.c +++ /dev/null @@ -1,96 +0,0 @@ -/* - * 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 :-) */ - -static uint64_t rdtsc(void) -{ -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; - -static 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(); -} - -static 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(void) -{ - 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); -} - diff --git a/Documentation/prctl/disable-tsc-test.c b/Documentation/prctl/disable-tsc-test.c deleted file mode 100644 index 8d494f7..0000000 --- a/Documentation/prctl/disable-tsc-test.c +++ /dev/null @@ -1,95 +0,0 @@ -/* - * Tests for prctl(PR_GET_TSC, ...) / prctl(PR_SET_TSC, ...) - * - * Basic test to test behaviour of PR_GET_TSC and PR_SET_TSC - */ - -#include <stdio.h> -#include <stdlib.h> -#include <unistd.h> -#include <signal.h> -#include <inttypes.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 - -const char *tsc_names[] = -{ - [0] = "[not set]", - [PR_TSC_ENABLE] = "PR_TSC_ENABLE", - [PR_TSC_SIGSEGV] = "PR_TSC_SIGSEGV", -}; - -static uint64_t rdtsc(void) -{ -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; -} - -static void sigsegv_cb(int sig) -{ - int tsc_val = 0; - - printf("[ SIG_SEGV ]\n"); - printf("prctl(PR_GET_TSC, &tsc_val); "); - fflush(stdout); - - if ( prctl(PR_GET_TSC, &tsc_val) == -1) - perror("prctl"); - - printf("tsc_val == %s\n", tsc_names[tsc_val]); - printf("prctl(PR_SET_TSC, PR_TSC_ENABLE)\n"); - fflush(stdout); - if ( prctl(PR_SET_TSC, PR_TSC_ENABLE) == -1) - perror("prctl"); - - printf("rdtsc() == "); -} - -int main(void) -{ - int tsc_val = 0; - - signal(SIGSEGV, sigsegv_cb); - - printf("rdtsc() == %llu\n", (unsigned long long)rdtsc()); - printf("prctl(PR_GET_TSC, &tsc_val); "); - fflush(stdout); - - if ( prctl(PR_GET_TSC, &tsc_val) == -1) - perror("prctl"); - - printf("tsc_val == %s\n", tsc_names[tsc_val]); - printf("rdtsc() == %llu\n", (unsigned long long)rdtsc()); - printf("prctl(PR_SET_TSC, PR_TSC_ENABLE)\n"); - fflush(stdout); - - if ( prctl(PR_SET_TSC, PR_TSC_ENABLE) == -1) - perror("prctl"); - - printf("rdtsc() == %llu\n", (unsigned long long)rdtsc()); - printf("prctl(PR_SET_TSC, PR_TSC_SIGSEGV)\n"); - fflush(stdout); - - if ( prctl(PR_SET_TSC, PR_TSC_SIGSEGV) == -1) - perror("prctl"); - - printf("rdtsc() == "); - fflush(stdout); - printf("%llu\n", (unsigned long long)rdtsc()); - fflush(stdout); - - exit(EXIT_SUCCESS); -} - |
