I'm resending this; I sent it before on July 8th but it probably got lost
in the shuffle.
The following patch exercises some of the recent additions to the
perf_event_open() syscall.
The PERF_SAMPLE_WEIGHT and PERF_SAMPLE_DATA_SRC sample types were
added in Linux 3.10.
It also adds more complete support for PERF_SAMPLE_REGS_USER which was
added in Linux 3.7
Signed-off-by: Vince Weaver <vincent.weaver@xxxxxxxxx>
diff --git a/syscalls/perf_event_open.c b/syscalls/perf_event_open.c
index 1f1bdbb..7499a3c 100644
--- a/syscalls/perf_event_open.c
+++ b/syscalls/perf_event_open.c
@@ -841,6 +841,10 @@ static long long random_sample_type(void)
sample_type |= PERF_SAMPLE_REGS_USER;
if (rand_bool())
sample_type |= PERF_SAMPLE_STACK_USER;
+ if (rand_bool())
+ sample_type |= PERF_SAMPLE_WEIGHT;
+ if (rand_bool())
+ sample_type |= PERF_SAMPLE_DATA_SRC;
return sample_type;
}
@@ -893,6 +897,34 @@ static int random_attr_size(void) {
return size;
}
+static long long random_branch_sample_type(void)
+{
+
+ long long branch_sample = 0;
+
+ if (rand() % 2)
+ return rand64();
+
+ if (rand_bool())
+ branch_sample |= PERF_SAMPLE_BRANCH_USER;
+ if (rand_bool())
+ branch_sample |= PERF_SAMPLE_BRANCH_KERNEL;
+ if (rand_bool())
+ branch_sample |= PERF_SAMPLE_BRANCH_HV;
+
+ if (rand_bool())
+ branch_sample |= PERF_SAMPLE_BRANCH_ANY;
+ if (rand_bool())
+ branch_sample |= PERF_SAMPLE_BRANCH_ANY_CALL;
+ if (rand_bool())
+ branch_sample |= PERF_SAMPLE_BRANCH_ANY_RETURN;
+ if (rand_bool())
+ branch_sample |= PERF_SAMPLE_BRANCH_IND_CALL;
+
+ return branch_sample;
+}
+
+
static void create_mostly_valid_counting_event(struct perf_event_attr *attr,
int group_leader)
{
@@ -944,6 +976,11 @@ static void create_mostly_valid_counting_event(struct perf_event_attr *attr,
/* leave config2 alone for now */
}
+ /* branch_sample_type not relevant if not sampling */
+
+ /* sample_regs_user not relevant if not sampling */
+
+ /* sample_stack_user not relevant if not sampling */
}
static void create_mostly_valid_sampling_event(struct perf_event_attr *attr,
@@ -1000,6 +1037,26 @@ static void create_mostly_valid_sampling_event(struct perf_event_attr *attr,
/* config1 set earlier */
}
+ attr->branch_sample_type = random_branch_sample_type();
+
+ /* sample_regs_user is a bitmask of CPU registers to record. */
+ /* The values come from arch/ARCH/include/uapi/asm/perf_regs.h */
+ /* Most architectures have fewer than 64 registers... */
+ switch(rand()%3) {
+ case 0: attr->sample_regs_user = rand()%16;
+ break;
+ case 1: attr->sample_regs_user = rand()%64;
+ break;
+ case 2: attr->sample_regs_user = rand64();
+ break;
+ default:
+ break;
+ }
+
+ /* sample_stack_user is the size of user stack backtrace we want */
+ /* if we pick too large of a value the kernel in theory truncates */
+ attr->sample_stack_user = rand32();
+
}
/* Creates a completely random event, unlikely to be valid */
--
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