Project import
diff --git a/sane_schedstat/Android.mk b/sane_schedstat/Android.mk new file mode 100644 index 0000000..c984b9f --- /dev/null +++ b/sane_schedstat/Android.mk
@@ -0,0 +1,12 @@ +LOCAL_PATH:= $(call my-dir) + +include $(CLEAR_VARS) + +LOCAL_SRC_FILES := sane_schedstat.c + +LOCAL_MODULE_PATH := $(TARGET_OUT_OPTIONAL_EXECUTABLES) +LOCAL_MODULE_TAGS := debug +LOCAL_MODULE := sane_schedstat +LOCAL_CFLAGS := -Wno-unused-parameter + +include $(BUILD_EXECUTABLE)
diff --git a/sane_schedstat/NOTICE b/sane_schedstat/NOTICE new file mode 100644 index 0000000..5d14293 --- /dev/null +++ b/sane_schedstat/NOTICE
@@ -0,0 +1,190 @@ + + Copyright (c) 2010, The Android Open Source Project + + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. + + + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. Definitions. + + "License" shall mean the terms and conditions for use, reproduction, + and distribution as defined by Sections 1 through 9 of this document. + + "Licensor" shall mean the copyright owner or entity authorized by + the copyright owner that is granting the License. + + "Legal Entity" shall mean the union of the acting entity and all + other entities that control, are controlled by, or are under common + control with that entity. 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If You + institute patent litigation against any entity (including a + cross-claim or counterclaim in a lawsuit) alleging that the Work + or a Contribution incorporated within the Work constitutes direct + or contributory patent infringement, then any patent licenses + granted to You under this License for that Work shall terminate + as of the date such litigation is filed. + + 4. Redistribution. You may reproduce and distribute copies of the + Work or Derivative Works thereof in any medium, with or without + modifications, and in Source or Object form, provided that You + meet the following conditions: + + (a) You must give any other recipients of the Work or + Derivative Works a copy of this License; and + + (b) You must cause any modified files to carry prominent notices + stating that You changed the files; and + + (c) You must retain, in the Source form of any Derivative Works + that You distribute, all copyright, patent, trademark, and + attribution notices from the Source form of the Work, + excluding those notices that do not pertain to any part of + the Derivative Works; and + + (d) If the Work includes a "NOTICE" text file as part of its + distribution, then any Derivative Works that You distribute must + include a readable copy of the attribution notices contained + within such NOTICE file, excluding those notices that do not + pertain to any part of the Derivative Works, in at least one + of the following places: within a NOTICE text file distributed + as part of the Derivative Works; within the Source form or + documentation, if provided along with the Derivative Works; or, + within a display generated by the Derivative Works, if and + wherever such third-party notices normally appear. The contents + of the NOTICE file are for informational purposes only and + do not modify the License. You may add Your own attribution + notices within Derivative Works that You distribute, alongside + or as an addendum to the NOTICE text from the Work, provided + that such additional attribution notices cannot be construed + as modifying the License. + + You may add Your own copyright statement to Your modifications and + may provide additional or different license terms and conditions + for use, reproduction, or distribution of Your modifications, or + for any such Derivative Works as a whole, provided Your use, + reproduction, and distribution of the Work otherwise complies with + the conditions stated in this License. + + 5. Submission of Contributions. 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Unless required by applicable law or + agreed to in writing, Licensor provides the Work (and each + Contributor provides its Contributions) on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or + implied, including, without limitation, any warranties or conditions + of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A + PARTICULAR PURPOSE. You are solely responsible for determining the + appropriateness of using or redistributing the Work and assume any + risks associated with Your exercise of permissions under this License. + + 8. Limitation of Liability. In no event and under no legal theory, + whether in tort (including negligence), contract, or otherwise, + unless required by applicable law (such as deliberate and grossly + negligent acts) or agreed to in writing, shall any Contributor be + liable to You for damages, including any direct, indirect, special, + incidental, or consequential damages of any character arising as a + result of this License or out of the use or inability to use the + Work (including but not limited to damages for loss of goodwill, + work stoppage, computer failure or malfunction, or any and all + other commercial damages or losses), even if such Contributor + has been advised of the possibility of such damages. + + 9. Accepting Warranty or Additional Liability. While redistributing + the Work or Derivative Works thereof, You may choose to offer, + and charge a fee for, acceptance of support, warranty, indemnity, + or other liability obligations and/or rights consistent with this + License. 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diff --git a/sane_schedstat/sane_schedstat.c b/sane_schedstat/sane_schedstat.c new file mode 100644 index 0000000..29d1063 --- /dev/null +++ b/sane_schedstat/sane_schedstat.c
@@ -0,0 +1,157 @@ +/* +** Copyright 2010 The Android Open Source Project +** +** Licensed under the Apache License, Version 2.0 (the "License"); +** you may not use this file except in compliance with the License. +** You may obtain a copy of the License at +** +** http://www.apache.org/licenses/LICENSE-2.0 +** +** Unless required by applicable law or agreed to in writing, software +** distributed under the License is distributed on an "AS IS" BASIS, +** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +** See the License for the specific language governing permissions and +** limitations under the License. +*/ + + +/* Opens /proc/sched_stat and diff's the counters. + Currently support version 15, modify parse() to support other + versions +*/ + +#include <stdlib.h> +#include <stdio.h> +#include <errno.h> +#include <sys/uio.h> +#include <unistd.h> +#include <sys/time.h> +#include <fcntl.h> + +#define MAX_CPU 2 + +struct cpu_stat { + /* sched_yield() stats */ + unsigned int yld_count; /* sched_yield() called */ + + /* schedule() stats */ + unsigned int sched_switch; /* switched to expired queue and reused it */ + unsigned int sched_count; /* schedule() called */ + unsigned int sched_goidle; /* schedule() left the cpu idle */ + + /* try_to_wake_up() stats */ + unsigned int ttwu_count; /* try_to_wake_up() called */ + /* try_to_wake_up() called and found the process being awakened last ran on + * the waking cpu */ + unsigned int ttwu_local; + + /* latency stats */ + unsigned long long cpu_time; /* time spent running by tasks (ms) */ + unsigned long long run_delay; /* time spent waiting to run by tasks (ms) */ + unsigned long pcount; /* number of tasks (not necessarily unique) given */ +}; + +struct cpu_stat cpu_prev[MAX_CPU]; +struct cpu_stat cpu_delta[MAX_CPU]; +struct cpu_stat tmp; + +static const char *next_line(const char *b) { + while (1) { + switch (*b) { + case '\n': + return b + 1; + case '\0': + return NULL; + } + b++; + } +} +static int print() { + int i; + + printf("CPU yield() schedule() switch idle ttwu() local cpu_time wait_time timeslices\n"); + for (i=0; i<MAX_CPU; i++) { + printf(" %2d %7u %10u %6u %4u %8u %5u %9llu %9llu %10lu\n", + i, + cpu_delta[i].yld_count, + cpu_delta[i].sched_count, cpu_delta[i].sched_switch, cpu_delta[i].sched_goidle, + cpu_delta[i].ttwu_count, cpu_delta[i].ttwu_local, + cpu_delta[i].cpu_time / 1000000, cpu_delta[i].run_delay / 1000000, cpu_delta[i].pcount); + } + return 0; +} + +static int parse_cpu_v15(const char *b) { + int cpu; + + if (sscanf(b, "cpu%d %u %u %u %u %u %u %llu %llu %lu\n", + &cpu, &tmp.yld_count, + &tmp.sched_switch, &tmp.sched_count, &tmp.sched_goidle, + &tmp.ttwu_count, &tmp.ttwu_local, + &tmp.cpu_time, &tmp.run_delay, &tmp.pcount) != 10) { + printf("Could not parse %s\n", b); + return -1; + } + + cpu_delta[cpu].yld_count = tmp.yld_count - cpu_prev[cpu].yld_count; + cpu_delta[cpu].sched_switch = tmp.sched_switch - cpu_prev[cpu].sched_switch; + cpu_delta[cpu].sched_count = tmp.sched_count - cpu_prev[cpu].sched_count; + cpu_delta[cpu].sched_goidle = tmp.sched_goidle - cpu_prev[cpu].sched_goidle; + cpu_delta[cpu].ttwu_count = tmp.ttwu_count - cpu_prev[cpu].ttwu_count; + cpu_delta[cpu].ttwu_local = tmp.ttwu_local - cpu_prev[cpu].ttwu_local; + cpu_delta[cpu].cpu_time = tmp.cpu_time - cpu_prev[cpu].cpu_time; + cpu_delta[cpu].run_delay = tmp.run_delay - cpu_prev[cpu].run_delay; + cpu_delta[cpu].pcount = tmp.pcount - cpu_prev[cpu].pcount; + + cpu_prev[cpu] = tmp; + return 0; +} + + +static int parse(const char *b) { + unsigned int version; + unsigned long long ts; + + if (sscanf(b, "version %u\n", &version) != 1) { + printf("Could not parse version\n"); + return -1; + } + switch (version) { + case 15: + b = next_line(b); + if (!b || sscanf(b, "timestamp %llu\n", &ts) != 1) { + printf("Could not parse timestamp\n"); + return -1; + } + while (1) { + b = next_line(b); + if (!b) break; + if (b[0] == 'c') { + if (parse_cpu_v15(b)) return -1; + } + } + break; + default: + printf("Can not handle version %u\n", version); + return -1; + } + return 0; +} + +int main(int argc, char **argv) { + int i; + int fd; + char buf[4096]; + + while (1) { + fd = open("/proc/schedstat", O_RDONLY); + if (fd < 0) return -1; + i = read(fd, buf, sizeof(buf) - 1); + close(fd); + buf[i] = '\0'; + if (parse(buf)) return -1; + print(); + sleep(1); + } + return 0; +}