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+ For corner cases now print results as OLD/NEW BEHAVIOR
+ Add the bugs/nmi_watchdog_group_leader test + Release version 0.24
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,151 @@ | ||
| /* nmi_watchdog_group_leader --- by Vince Weaver vweaver1 _at_ eecs.utk.edu */ | ||
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| /* If the NMI watchdog is enabled it will steal a performance counter. */ | ||
| /* There is a bug that if you try to use the maximum number of counters */ | ||
| /* (not counting the stolen one) with a group leader, sys_perf_open() */ | ||
| /* will indicate success, as will starting the count, but you will fail */ | ||
| /* at read time. */ | ||
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| /* This bug still exists in 3.x */ | ||
| /* The perf NMI watchdog was not introduced until 2.6.34 */ | ||
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| /* This also triggers in the case of the schedulability bug */ | ||
| /* but since that was fixed in 2.6.34 then in theory there is */ | ||
| /* no overlap in the tests. */ | ||
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| #include <stdlib.h> | ||
| #include <stdio.h> | ||
| #include <string.h> | ||
| #include <unistd.h> | ||
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| #include <unistd.h> | ||
| #include <asm/unistd.h> | ||
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| #include <sys/ioctl.h> | ||
| #include <errno.h> | ||
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| #include "perf_event.h" | ||
| #include "perf_helpers.h" | ||
| #include "test_utils.h" | ||
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| int main(int argc, char **argv) { | ||
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| int events[MAX_TEST_EVENTS]; | ||
| int fd[MAX_TEST_EVENTS]; | ||
| int count=MAX_TEST_EVENTS; | ||
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| int i,j,n; | ||
| int ret1,ret2,ret3; | ||
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| struct perf_event_attr pe; | ||
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| int quiet,nmi_enabled; | ||
| char test_string[]="Testing if NMI watchdog breaks event groups " | ||
| "of max size..."; | ||
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| quiet=test_quiet(); | ||
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| if (!quiet) { | ||
| printf("If the NMI watchdog is enabled it will steal a performance\n"); | ||
| printf(" counter. There is a bug that if you try to use the\n"); | ||
| printf(" maximum number of counters anyway, sys_perf_open()\n"); | ||
| printf(" will succede but will fail when you try to read()\n"); | ||
| printf(" the values.\n\n"); | ||
| } | ||
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| nmi_enabled=detect_nmi_watchdog(); | ||
| if (!nmi_enabled) { | ||
| if (!quiet) { | ||
| printf("No NMI watchdog detected, so skipping test.\n\n"); | ||
| } | ||
| test_skip(test_string); | ||
| } | ||
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| if (copy_events(events)) { | ||
| test_unimplemented(test_string); | ||
| } | ||
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| for(i=1;i<count;i++) { | ||
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| if (!quiet) printf("Trying %d events:\n",i); | ||
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| memset(&pe,0,sizeof(struct perf_event_attr)); | ||
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| pe.type=PERF_TYPE_RAW; | ||
| pe.size=sizeof(struct perf_event_attr); | ||
| pe.read_format=PERF_FORMAT_GROUP|PERF_FORMAT_ID; | ||
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| fd[0]=-1; | ||
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| for(j=0;j<i;j++) { | ||
| pe.config=events[j]; | ||
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| if (j==0) { | ||
| pe.disabled=1; | ||
| pe.pinned=1; | ||
| } | ||
| else { | ||
| pe.disabled=0; | ||
| pe.pinned=0; | ||
| } | ||
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| fd[j]=perf_event_open(&pe,0,-1,fd[0],0); | ||
| if (fd[j]<0) { | ||
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| if (!quiet) printf("Finished after event %d\n\n",j); | ||
| test_pass(test_string); | ||
| exit(1); | ||
| } | ||
| } | ||
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| /* start */ | ||
| ret1=ioctl(fd[0], PERF_EVENT_IOC_ENABLE,0); | ||
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| /* stop */ | ||
| ret2=ioctl(fd[0], PERF_EVENT_IOC_DISABLE,0); | ||
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| #define BUFFER_SIZE 256 | ||
| long long buffer[BUFFER_SIZE]; | ||
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| ret3=read(fd[0],buffer,BUFFER_SIZE*sizeof(long long)); | ||
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| if (ret3<=0) { | ||
| if (!quiet) { | ||
| printf("Unexpected read result %d %s\n",ret3,strerror(errno)); | ||
| } | ||
| test_fail(test_string); | ||
| } | ||
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| if (buffer[0]!=j){ | ||
| if (!quiet) printf("Error! buffer count is %lld not %d!\n", | ||
| buffer[0],j); | ||
| test_fail(test_string); | ||
| } | ||
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| if (ret1<0) { | ||
| if (!quiet) printf("Error starting!\n"); | ||
| test_fail(test_string); | ||
| } | ||
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| if (ret2<0) { | ||
| if (!quiet) printf("Error stopping!\n"); | ||
| test_fail(test_string); | ||
| } | ||
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| if (!quiet) { | ||
| for(n=0;n<buffer[0];n++) { | ||
| printf("\t%x %lld\n",events[n],buffer[1+(n*2)]); | ||
| } | ||
| } | ||
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| for(n=0;n<j;n++) { | ||
| close(fd[n]); | ||
| } | ||
| } | ||
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| test_pass(test_string); | ||
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| return 0; | ||
| } |
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