diff options
author | Arthur She <arthur.she@linaro.org> | 2014-09-15 17:12:51 -0700 |
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committer | Arthur She <arthur.she@linaro.org> | 2014-09-15 17:12:51 -0700 |
commit | 57621049dccbdd6a74d943ca81ddedaadac467fd (patch) | |
tree | e8e58b5e88befdad313e4e039fe0fa0167310d32 /powerpc/pmu/ebb/instruction_count_test.c | |
parent | cb0e1116a994f5b4fec7ad70b18988d19a3a6ae0 (diff) |
Update to commit d6e35d087fe9d71f4ac201e89db478485c808890 from upstream kernel
Diffstat (limited to 'powerpc/pmu/ebb/instruction_count_test.c')
-rw-r--r-- | powerpc/pmu/ebb/instruction_count_test.c | 164 |
1 files changed, 0 insertions, 164 deletions
diff --git a/powerpc/pmu/ebb/instruction_count_test.c b/powerpc/pmu/ebb/instruction_count_test.c deleted file mode 100644 index f8190fa..0000000 --- a/powerpc/pmu/ebb/instruction_count_test.c +++ /dev/null @@ -1,164 +0,0 @@ -/* - * Copyright 2014, Michael Ellerman, IBM Corp. - * Licensed under GPLv2. - */ - -#define _GNU_SOURCE - -#include <stdio.h> -#include <stdbool.h> -#include <string.h> -#include <sys/prctl.h> - -#include "ebb.h" - - -/* - * Run a calibrated instruction loop and count instructions executed using - * EBBs. Make sure the counts look right. - */ - -extern void thirty_two_instruction_loop(uint64_t loops); - -static bool counters_frozen = true; - -static int do_count_loop(struct event *event, uint64_t instructions, - uint64_t overhead, bool report) -{ - int64_t difference, expected; - double percentage; - - clear_ebb_stats(); - - counters_frozen = false; - mb(); - mtspr(SPRN_MMCR0, mfspr(SPRN_MMCR0) & ~MMCR0_FC); - - thirty_two_instruction_loop(instructions >> 5); - - counters_frozen = true; - mb(); - mtspr(SPRN_MMCR0, mfspr(SPRN_MMCR0) | MMCR0_FC); - - count_pmc(4, sample_period); - - event->result.value = ebb_state.stats.pmc_count[4-1]; - expected = instructions + overhead; - difference = event->result.value - expected; - percentage = (double)difference / event->result.value * 100; - - if (report) { - printf("Looped for %lu instructions, overhead %lu\n", instructions, overhead); - printf("Expected %lu\n", expected); - printf("Actual %llu\n", event->result.value); - printf("Error %ld, %f%%\n", difference, percentage); - printf("Took %d EBBs\n", ebb_state.stats.ebb_count); - } - - if (difference < 0) - difference = -difference; - - /* Tolerate a difference of up to 0.0001 % */ - difference *= 10000 * 100; - if (difference / event->result.value) - return -1; - - return 0; -} - -/* Count how many instructions it takes to do a null loop */ -static uint64_t determine_overhead(struct event *event) -{ - uint64_t current, overhead; - int i; - - do_count_loop(event, 0, 0, false); - overhead = event->result.value; - - for (i = 0; i < 100; i++) { - do_count_loop(event, 0, 0, false); - current = event->result.value; - if (current < overhead) { - printf("Replacing overhead %lu with %lu\n", overhead, current); - overhead = current; - } - } - - return overhead; -} - -static void pmc4_ebb_callee(void) -{ - uint64_t val; - - val = mfspr(SPRN_BESCR); - if (!(val & BESCR_PMEO)) { - ebb_state.stats.spurious++; - goto out; - } - - ebb_state.stats.ebb_count++; - count_pmc(4, sample_period); -out: - if (counters_frozen) - reset_ebb_with_clear_mask(MMCR0_PMAO); - else - reset_ebb(); -} - -int instruction_count(void) -{ - struct event event; - uint64_t overhead; - - event_init_named(&event, 0x400FA, "PM_RUN_INST_CMPL"); - event_leader_ebb_init(&event); - event.attr.exclude_kernel = 1; - event.attr.exclude_hv = 1; - event.attr.exclude_idle = 1; - - FAIL_IF(event_open(&event)); - FAIL_IF(ebb_event_enable(&event)); - - sample_period = COUNTER_OVERFLOW; - - setup_ebb_handler(pmc4_ebb_callee); - mtspr(SPRN_MMCR0, mfspr(SPRN_MMCR0) & ~MMCR0_FC); - ebb_global_enable(); - - overhead = determine_overhead(&event); - printf("Overhead of null loop: %lu instructions\n", overhead); - - /* Run for 1M instructions */ - FAIL_IF(do_count_loop(&event, 0x100000, overhead, true)); - - /* Run for 10M instructions */ - FAIL_IF(do_count_loop(&event, 0xa00000, overhead, true)); - - /* Run for 100M instructions */ - FAIL_IF(do_count_loop(&event, 0x6400000, overhead, true)); - - /* Run for 1G instructions */ - FAIL_IF(do_count_loop(&event, 0x40000000, overhead, true)); - - /* Run for 16G instructions */ - FAIL_IF(do_count_loop(&event, 0x400000000, overhead, true)); - - /* Run for 64G instructions */ - FAIL_IF(do_count_loop(&event, 0x1000000000, overhead, true)); - - /* Run for 128G instructions */ - FAIL_IF(do_count_loop(&event, 0x2000000000, overhead, true)); - - ebb_global_disable(); - event_close(&event); - - printf("Finished OK\n"); - - return 0; -} - -int main(void) -{ - return test_harness(instruction_count, "instruction_count"); -} |