/* * Copyright 2013, Michael Ellerman, IBM Corp. * Licensed under GPLv2. */ #define _GNU_SOURCE #include #include #include #include #include "event.h" #include "utils.h" #include "lib.h" extern void thirty_two_instruction_loop(u64 loops); static void setup_event(struct event *e, u64 config, char *name) { event_init_opts(e, config, PERF_TYPE_HARDWARE, name); e->attr.disabled = 1; e->attr.exclude_kernel = 1; e->attr.exclude_hv = 1; e->attr.exclude_idle = 1; } static int do_count_loop(struct event *events, u64 instructions, u64 overhead, bool report) { s64 difference, expected; double percentage; prctl(PR_TASK_PERF_EVENTS_ENABLE); /* Run for 1M instructions */ thirty_two_instruction_loop(instructions >> 5); prctl(PR_TASK_PERF_EVENTS_DISABLE); event_read(&events[0]); event_read(&events[1]); expected = instructions + overhead; difference = events[0].result.value - expected; percentage = (double)difference / events[0].result.value * 100; if (report) { event_report(&events[0]); event_report(&events[1]); printf("Looped for %llu instructions, overhead %llu\n", instructions, overhead); printf("Expected %llu\n", expected); printf("Actual %llu\n", events[0].result.value); printf("Delta %lld, %f%%\n", difference, percentage); } event_reset(&events[0]); event_reset(&events[1]); if (difference < 0) difference = -difference; /* Tolerate a difference below 0.0001 % */ difference *= 10000 * 100; if (difference / events[0].result.value) return -1; return 0; } /* Count how many instructions it takes to do a null loop */ static u64 determine_overhead(struct event *events) { u64 current, overhead; int i; do_count_loop(events, 0, 0, false); overhead = events[0].result.value; for (i = 0; i < 100; i++) { do_count_loop(events, 0, 0, false); current = events[0].result.value; if (current < overhead) { printf("Replacing overhead %llu with %llu\n", overhead, current); overhead = current; } } return overhead; } static int test_body(void) { struct event events[2]; u64 overhead; setup_event(&events[0], PERF_COUNT_HW_INSTRUCTIONS, "instructions"); setup_event(&events[1], PERF_COUNT_HW_CPU_CYCLES, "cycles"); if (event_open(&events[0])) { perror("perf_event_open"); return -1; } if (event_open_with_group(&events[1], events[0].fd)) { perror("perf_event_open"); return -1; } overhead = determine_overhead(events); printf("Overhead of null loop: %llu instructions\n", overhead); /* Run for 1Mi instructions */ FAIL_IF(do_count_loop(events, 1000000, overhead, true)); /* Run for 10Mi instructions */ FAIL_IF(do_count_loop(events, 10000000, overhead, true)); /* Run for 100Mi instructions */ FAIL_IF(do_count_loop(events, 100000000, overhead, true)); /* Run for 1Bi instructions */ FAIL_IF(do_count_loop(events, 1000000000, overhead, true)); /* Run for 16Bi instructions */ FAIL_IF(do_count_loop(events, 16000000000, overhead, true)); /* Run for 64Bi instructions */ FAIL_IF(do_count_loop(events, 64000000000, overhead, true)); event_close(&events[0]); event_close(&events[1]); return 0; } static int count_instructions(void) { return eat_cpu(test_body); } int main(void) { return test_harness(count_instructions, "count_instructions"); } bdcb12b4c10ab1bf333ed25ec'>Makefile
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authorRoger Shimizu <rogershimizu@gmail.com>2017-01-30 20:07:29 +0900
committerGregory CLEMENT <gregory.clement@free-electrons.com>2017-01-31 12:19:32 +0100
commit81917bad86a66f2bdcb12b4c10ab1bf333ed25ec (patch)
tree3d56cb771fc5f0a37412e62f99aacc6d21a646c0 /tools/usb/Makefile
parent0c744ea4f77d72b3dcebb7a8f2684633ec79be88 (diff)
ARM: dts: orion5x-lschl: Fix model name
Model name should be consistent with legacy device file, so that user can migrate their system from legacy device support to device-tree safely. Legacy device file is currently removed, but it can be found on 4.8 or previous version of linux: arch/arm/mach-orion5x/ls-chl-setup.c Fixes: f94f268979a2 ("ARM: dts: orion5x: convert ls-chl to FDT") Cc: Ashley Hughes <ashley.hughes@blueyonder.co.uk> Signed-off-by: Roger Shimizu <rogershimizu@gmail.com> Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Diffstat (limited to 'tools/usb/Makefile')