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 <[email protected]> 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 */ -- To unsubscribe from this list: send the line "unsubscribe trinity" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
