storaged/storaged_diskstats.cpp - android-core - Git at Google

 /*
  * Copyright (C) 2017 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.
  */

 #define LOG_TAG "storaged"

 #include <stdint.h>
 #include <stdlib.h>

 #include <sstream>

 #include <android-base/file.h>
 #include <android-base/logging.h>
 #include <log/log_event_list.h>

 #include "storaged.h"
 #include "storaged_diskstats.h"

 namespace {

 using android::sp;
 using android::hardware::health::V2_0::DiskStats;
 using android::hardware::health::V2_0::IHealth;
 using android::hardware::health::V2_0::Result;
 using android::hardware::health::V2_0::toString;

 #ifdef DEBUG
 void log_debug_disk_perf(struct disk_perf* perf, const char* type) {
     // skip if the input structure are all zeros
     if (perf == NULL || perf->is_zero()) return;

     LOG_TO(SYSTEM, INFO) << "disk_perf " << type
               << " rd: " << perf->read_perf << " kbps, " << perf->read_ios << " iops"
               << " wr: " << perf->write_perf << " kbps, " << perf->write_ios << " iops"
               << " q: " << perf->queue;
 }
 #else
 void log_debug_disk_perf(struct disk_perf* perf, const char* type) {}
 #endif

 void log_event_disk_stats(struct disk_stats* stats, const char* type) {
     // skip if the input structure are all zeros
     if (stats == NULL || stats->is_zero()) return;

     android_log_event_list(EVENTLOGTAG_DISKSTATS)
         << type << stats->start_time << stats->end_time
         << stats->read_ios << stats->read_merges
         << stats->read_sectors << stats->read_ticks
         << stats->write_ios << stats->write_merges
         << stats->write_sectors << stats->write_ticks
         << (uint64_t)stats->io_avg << stats->io_ticks << stats->io_in_queue
         << LOG_ID_EVENTS;
 }

 } // namespace

 bool get_time(struct timespec* ts) {
     // Use monotonic to exclude suspend time so that we measure IO bytes/sec
     // when system is running.
     int ret = clock_gettime(CLOCK_MONOTONIC, ts);
     if (ret < 0) {
         PLOG_TO(SYSTEM, ERROR) << "clock_gettime() failed";
         return false;
     }
     return true;
 }

 void init_disk_stats_other(const struct timespec& ts, struct disk_stats* stats) {
     stats->start_time = 0;
     stats->end_time = (uint64_t)ts.tv_sec * SEC_TO_MSEC + ts.tv_nsec / (MSEC_TO_USEC * USEC_TO_NSEC);
     stats->counter = 1;
     stats->io_avg = (double)stats->io_in_flight;
 }

 bool parse_disk_stats(const char* disk_stats_path, struct disk_stats* stats) {
     // Get time
     struct timespec ts;
     if (!get_time(&ts)) {
         return false;
     }

     std::string buffer;
     if (!android::base::ReadFileToString(disk_stats_path, &buffer)) {
         PLOG_TO(SYSTEM, ERROR) << disk_stats_path << ": ReadFileToString failed.";
         return false;
     }

     // Regular diskstats entries
     std::stringstream ss(buffer);
     for (uint i = 0; i < DISK_STATS_SIZE; ++i) {
         ss >> *((uint64_t*)stats + i);
     }
     // Other entries
     init_disk_stats_other(ts, stats);
     return true;
 }

 void convert_hal_disk_stats(struct disk_stats* dst, const DiskStats& src) {
     dst->read_ios = src.reads;
     dst->read_merges = src.readMerges;
     dst->read_sectors = src.readSectors;
     dst->read_ticks = src.readTicks;
     dst->write_ios = src.writes;
     dst->write_merges = src.writeMerges;
     dst->write_sectors = src.writeSectors;
     dst->write_ticks = src.writeTicks;
     dst->io_in_flight = src.ioInFlight;
     dst->io_ticks = src.ioTicks;
     dst->io_in_queue = src.ioInQueue;
 }

 bool get_disk_stats_from_health_hal(const sp<IHealth>& service, struct disk_stats* stats) {
     struct timespec ts;
     if (!get_time(&ts)) {
         return false;
     }

     bool success = false;
     auto ret = service->getDiskStats([&success, stats](auto result, const auto& halStats) {
         if (result == Result::NOT_SUPPORTED) {
             LOG_TO(SYSTEM, DEBUG) << "getDiskStats is not supported on health HAL.";
             return;
         }
         if (result != Result::SUCCESS || halStats.size() == 0) {
             LOG_TO(SYSTEM, ERROR) << "getDiskStats failed with result " << toString(result)
                                   << " and size " << halStats.size();
             return;
         }

         convert_hal_disk_stats(stats, halStats[0]);
         success = true;
     });

     if (!ret.isOk()) {
         LOG_TO(SYSTEM, ERROR) << "getDiskStats failed with " << ret.description();
         return false;
     }

     if (!success) {
         return false;
     }

     init_disk_stats_other(ts, stats);
     return true;
 }

 struct disk_perf get_disk_perf(struct disk_stats* stats)
 {
     struct disk_perf perf = {};

     if (stats->io_ticks) {
         if (stats->read_ticks) {
             unsigned long long divisor = stats->read_ticks * stats->io_ticks;
             perf.read_perf = ((unsigned long long)SECTOR_SIZE *
                               stats->read_sectors * stats->io_in_queue +
                               (divisor >> 1)) / divisor;
             perf.read_ios = ((unsigned long long)SEC_TO_MSEC *
                              stats->read_ios * stats->io_in_queue +
                              (divisor >> 1)) / divisor;
         }
         if (stats->write_ticks) {
             unsigned long long divisor = stats->write_ticks * stats->io_ticks;
             perf.write_perf = ((unsigned long long)SECTOR_SIZE *
                                stats->write_sectors * stats->io_in_queue +
                                (divisor >> 1)) / divisor;
             perf.write_ios = ((unsigned long long)SEC_TO_MSEC *
                               stats->write_ios * stats->io_in_queue +
                               (divisor >> 1)) / divisor;
         }
         perf.queue = (stats->io_in_queue + (stats->io_ticks >> 1)) /
                      stats->io_ticks;
     }
     return perf;
 }

 void get_inc_disk_stats(const struct disk_stats* prev, const struct disk_stats* curr,
                         struct disk_stats* inc)
 {
     *inc = *curr - *prev;
     inc->start_time = prev->end_time;
     inc->end_time = curr->end_time;
     inc->io_avg = curr->io_avg;
     inc->counter = 1;
 }

 // Add src to dst
 void add_disk_stats(struct disk_stats* src, struct disk_stats* dst)
 {
     if (dst->end_time != 0 && dst->end_time != src->start_time) {
         LOG_TO(SYSTEM, WARNING) << "Two dis-continuous periods of diskstats"
             << " are added. dst end with " << dst->end_time
             << ", src start with " << src->start_time;
     }

     *dst += *src;

     dst->io_in_flight = src->io_in_flight;
     if (dst->counter + src->counter) {
         dst->io_avg =
             ((dst->io_avg * dst->counter) + (src->io_avg * src->counter)) /
             (dst->counter + src->counter);
     }
     dst->counter += src->counter;
     dst->end_time = src->end_time;
     if (dst->start_time == 0) {
         dst->start_time = src->start_time;
     }
 }

 /* disk_stats_monitor */
 void disk_stats_monitor::update_mean()
 {
     CHECK(mValid);
     mMean.read_perf = (uint32_t)mStats.read_perf.get_mean();
     mMean.read_ios = (uint32_t)mStats.read_ios.get_mean();
     mMean.write_perf = (uint32_t)mStats.write_perf.get_mean();
     mMean.write_ios = (uint32_t)mStats.write_ios.get_mean();
     mMean.queue = (uint32_t)mStats.queue.get_mean();
 }

 void disk_stats_monitor::update_std()
 {
     CHECK(mValid);
     mStd.read_perf = (uint32_t)mStats.read_perf.get_std();
     mStd.read_ios = (uint32_t)mStats.read_ios.get_std();
     mStd.write_perf = (uint32_t)mStats.write_perf.get_std();
     mStd.write_ios = (uint32_t)mStats.write_ios.get_std();
     mStd.queue = (uint32_t)mStats.queue.get_std();
 }

 void disk_stats_monitor::add(struct disk_perf* perf)
 {
     mStats.read_perf.add(perf->read_perf);
     mStats.read_ios.add(perf->read_ios);
     mStats.write_perf.add(perf->write_perf);
     mStats.write_ios.add(perf->write_ios);
     mStats.queue.add(perf->queue);
 }

 void disk_stats_monitor::evict(struct disk_perf* perf) {
     mStats.read_perf.evict(perf->read_perf);
     mStats.read_ios.evict(perf->read_ios);
     mStats.write_perf.evict(perf->write_perf);
     mStats.write_ios.evict(perf->write_ios);
     mStats.queue.evict(perf->queue);
 }

 bool disk_stats_monitor::detect(struct disk_perf* perf)
 {
     return ((double)perf->queue >= (double)mMean.queue + mSigma * (double)mStd.queue) &&
         ((double)perf->read_perf < (double)mMean.read_perf - mSigma * (double)mStd.read_perf) &&
         ((double)perf->write_perf < (double)mMean.write_perf - mSigma * (double)mStd.write_perf);
 }

 void disk_stats_monitor::update(struct disk_stats* curr)
 {
     disk_stats inc;
     get_inc_disk_stats(&mPrevious, curr, &inc);
     add_disk_stats(&inc, &mAccumulate_pub);

     struct disk_perf perf = get_disk_perf(&inc);
     log_debug_disk_perf(&perf, "regular");

     add(&perf);
     mBuffer.push(perf);
     if (mBuffer.size() > mWindow) {
         evict(&mBuffer.front());
         mBuffer.pop();
         mValid = true;
     }

     // Update internal data structures
     if (LIKELY(mValid)) {
         CHECK_EQ(mBuffer.size(), mWindow);
         update_mean();
         update_std();
         if (UNLIKELY(detect(&perf))) {
             mStall = true;
             add_disk_stats(&inc, &mAccumulate);
             log_debug_disk_perf(&mMean, "stalled_mean");
             log_debug_disk_perf(&mStd, "stalled_std");
         } else {
             if (mStall) {
                 struct disk_perf acc_perf = get_disk_perf(&mAccumulate);
                 log_debug_disk_perf(&acc_perf, "stalled");
                 log_event_disk_stats(&mAccumulate, "stalled");
                 mStall = false;
                 memset(&mAccumulate, 0, sizeof(mAccumulate));
             }
         }
     }

     mPrevious = *curr;
 }

 void disk_stats_monitor::update() {
     disk_stats curr;
     if (mHealth != nullptr) {
         if (!get_disk_stats_from_health_hal(mHealth, &curr)) {
             return;
         }
     } else {
         if (!parse_disk_stats(DISK_STATS_PATH, &curr)) {
             return;
         }
     }

     update(&curr);
 }

 void disk_stats_monitor::publish(void)
 {
     struct disk_perf perf = get_disk_perf(&mAccumulate_pub);
     log_debug_disk_perf(&perf, "regular");
     log_event_disk_stats(&mAccumulate, "regular");
     // Reset global structures
     memset(&mAccumulate_pub, 0, sizeof(struct disk_stats));
 }
	/*
	* Copyright (C) 2017 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.
	*/

	#define LOG_TAG "storaged"

	#include <stdint.h>
	#include <stdlib.h>

	#include <sstream>

	#include <android-base/file.h>
	#include <android-base/logging.h>
	#include <log/log_event_list.h>

	#include "storaged.h"
	#include "storaged_diskstats.h"

	namespace {

	using android::sp;
	using android::hardware::health::V2_0::DiskStats;
	using android::hardware::health::V2_0::IHealth;
	using android::hardware::health::V2_0::Result;
	using android::hardware::health::V2_0::toString;

	#ifdef DEBUG
	void log_debug_disk_perf(struct disk_perf* perf, const char* type) {
	// skip if the input structure are all zeros
	if (perf == NULL \|\| perf->is_zero()) return;

	LOG_TO(SYSTEM, INFO) << "disk_perf " << type
	<< " rd: " << perf->read_perf << " kbps, " << perf->read_ios << " iops"
	<< " wr: " << perf->write_perf << " kbps, " << perf->write_ios << " iops"
	<< " q: " << perf->queue;
	}
	#else
	void log_debug_disk_perf(struct disk_perf* perf, const char* type) {}
	#endif

	void log_event_disk_stats(struct disk_stats* stats, const char* type) {
	// skip if the input structure are all zeros
	if (stats == NULL \|\| stats->is_zero()) return;

	android_log_event_list(EVENTLOGTAG_DISKSTATS)
	<< type << stats->start_time << stats->end_time
	<< stats->read_ios << stats->read_merges
	<< stats->read_sectors << stats->read_ticks
	<< stats->write_ios << stats->write_merges
	<< stats->write_sectors << stats->write_ticks
	<< (uint64_t)stats->io_avg << stats->io_ticks << stats->io_in_queue
	<< LOG_ID_EVENTS;
	}

	} // namespace

	bool get_time(struct timespec* ts) {
	// Use monotonic to exclude suspend time so that we measure IO bytes/sec
	// when system is running.
	int ret = clock_gettime(CLOCK_MONOTONIC, ts);
	if (ret < 0) {
	PLOG_TO(SYSTEM, ERROR) << "clock_gettime() failed";
	return false;
	}
	return true;
	}

	void init_disk_stats_other(const struct timespec& ts, struct disk_stats* stats) {
	stats->start_time = 0;
	stats->end_time = (uint64_t)ts.tv_sec * SEC_TO_MSEC + ts.tv_nsec / (MSEC_TO_USEC * USEC_TO_NSEC);
	stats->counter = 1;
	stats->io_avg = (double)stats->io_in_flight;
	}

	bool parse_disk_stats(const char* disk_stats_path, struct disk_stats* stats) {
	// Get time
	struct timespec ts;
	if (!get_time(&ts)) {
	return false;
	}

	std::string buffer;
	if (!android::base::ReadFileToString(disk_stats_path, &buffer)) {
	PLOG_TO(SYSTEM, ERROR) << disk_stats_path << ": ReadFileToString failed.";
	return false;
	}

	// Regular diskstats entries
	std::stringstream ss(buffer);
	for (uint i = 0; i < DISK_STATS_SIZE; ++i) {
	ss >> ((uint64_t)stats + i);
	}
	// Other entries
	init_disk_stats_other(ts, stats);
	return true;
	}

	void convert_hal_disk_stats(struct disk_stats* dst, const DiskStats& src) {
	dst->read_ios = src.reads;
	dst->read_merges = src.readMerges;
	dst->read_sectors = src.readSectors;
	dst->read_ticks = src.readTicks;
	dst->write_ios = src.writes;
	dst->write_merges = src.writeMerges;
	dst->write_sectors = src.writeSectors;
	dst->write_ticks = src.writeTicks;
	dst->io_in_flight = src.ioInFlight;
	dst->io_ticks = src.ioTicks;
	dst->io_in_queue = src.ioInQueue;
	}

	bool get_disk_stats_from_health_hal(const sp<IHealth>& service, struct disk_stats* stats) {
	struct timespec ts;
	if (!get_time(&ts)) {
	return false;
	}

	bool success = false;
	auto ret = service->getDiskStats([&success, stats](auto result, const auto& halStats) {
	if (result == Result::NOT_SUPPORTED) {
	LOG_TO(SYSTEM, DEBUG) << "getDiskStats is not supported on health HAL.";
	return;
	}
	if (result != Result::SUCCESS \|\| halStats.size() == 0) {
	LOG_TO(SYSTEM, ERROR) << "getDiskStats failed with result " << toString(result)
	<< " and size " << halStats.size();
	return;
	}

	convert_hal_disk_stats(stats, halStats[0]);
	success = true;
	});

	if (!ret.isOk()) {
	LOG_TO(SYSTEM, ERROR) << "getDiskStats failed with " << ret.description();
	return false;
	}

	if (!success) {
	return false;
	}

	init_disk_stats_other(ts, stats);
	return true;
	}

	struct disk_perf get_disk_perf(struct disk_stats* stats)
	{
	struct disk_perf perf = {};

	if (stats->io_ticks) {
	if (stats->read_ticks) {
	unsigned long long divisor = stats->read_ticks * stats->io_ticks;
	perf.read_perf = ((unsigned long long)SECTOR_SIZE *
	stats->read_sectors * stats->io_in_queue +
	(divisor >> 1)) / divisor;
	perf.read_ios = ((unsigned long long)SEC_TO_MSEC *
	stats->read_ios * stats->io_in_queue +
	(divisor >> 1)) / divisor;
	}
	if (stats->write_ticks) {
	unsigned long long divisor = stats->write_ticks * stats->io_ticks;
	perf.write_perf = ((unsigned long long)SECTOR_SIZE *
	stats->write_sectors * stats->io_in_queue +
	(divisor >> 1)) / divisor;
	perf.write_ios = ((unsigned long long)SEC_TO_MSEC *
	stats->write_ios * stats->io_in_queue +
	(divisor >> 1)) / divisor;
	}
	perf.queue = (stats->io_in_queue + (stats->io_ticks >> 1)) /
	stats->io_ticks;
	}
	return perf;
	}

	void get_inc_disk_stats(const struct disk_stats* prev, const struct disk_stats* curr,
	struct disk_stats* inc)
	{
	inc = curr - *prev;
	inc->start_time = prev->end_time;
	inc->end_time = curr->end_time;
	inc->io_avg = curr->io_avg;
	inc->counter = 1;
	}

	// Add src to dst
	void add_disk_stats(struct disk_stats* src, struct disk_stats* dst)
	{
	if (dst->end_time != 0 && dst->end_time != src->start_time) {
	LOG_TO(SYSTEM, WARNING) << "Two dis-continuous periods of diskstats"
	<< " are added. dst end with " << dst->end_time
	<< ", src start with " << src->start_time;
	}

	dst += src;

	dst->io_in_flight = src->io_in_flight;
	if (dst->counter + src->counter) {
	dst->io_avg =
	((dst->io_avg * dst->counter) + (src->io_avg * src->counter)) /
	(dst->counter + src->counter);
	}
	dst->counter += src->counter;
	dst->end_time = src->end_time;
	if (dst->start_time == 0) {
	dst->start_time = src->start_time;
	}
	}

	/* disk_stats_monitor */
	void disk_stats_monitor::update_mean()
	{
	CHECK(mValid);
	mMean.read_perf = (uint32_t)mStats.read_perf.get_mean();
	mMean.read_ios = (uint32_t)mStats.read_ios.get_mean();
	mMean.write_perf = (uint32_t)mStats.write_perf.get_mean();
	mMean.write_ios = (uint32_t)mStats.write_ios.get_mean();
	mMean.queue = (uint32_t)mStats.queue.get_mean();
	}

	void disk_stats_monitor::update_std()
	{
	CHECK(mValid);
	mStd.read_perf = (uint32_t)mStats.read_perf.get_std();
	mStd.read_ios = (uint32_t)mStats.read_ios.get_std();
	mStd.write_perf = (uint32_t)mStats.write_perf.get_std();
	mStd.write_ios = (uint32_t)mStats.write_ios.get_std();
	mStd.queue = (uint32_t)mStats.queue.get_std();
	}

	void disk_stats_monitor::add(struct disk_perf* perf)
	{
	mStats.read_perf.add(perf->read_perf);
	mStats.read_ios.add(perf->read_ios);
	mStats.write_perf.add(perf->write_perf);
	mStats.write_ios.add(perf->write_ios);
	mStats.queue.add(perf->queue);
	}

	void disk_stats_monitor::evict(struct disk_perf* perf) {
	mStats.read_perf.evict(perf->read_perf);
	mStats.read_ios.evict(perf->read_ios);
	mStats.write_perf.evict(perf->write_perf);
	mStats.write_ios.evict(perf->write_ios);
	mStats.queue.evict(perf->queue);
	}

	bool disk_stats_monitor::detect(struct disk_perf* perf)
	{
	return ((double)perf->queue >= (double)mMean.queue + mSigma * (double)mStd.queue) &&
	((double)perf->read_perf < (double)mMean.read_perf - mSigma * (double)mStd.read_perf) &&
	((double)perf->write_perf < (double)mMean.write_perf - mSigma * (double)mStd.write_perf);
	}

	void disk_stats_monitor::update(struct disk_stats* curr)
	{
	disk_stats inc;
	get_inc_disk_stats(&mPrevious, curr, &inc);
	add_disk_stats(&inc, &mAccumulate_pub);

	struct disk_perf perf = get_disk_perf(&inc);
	log_debug_disk_perf(&perf, "regular");

	add(&perf);
	mBuffer.push(perf);
	if (mBuffer.size() > mWindow) {
	evict(&mBuffer.front());
	mBuffer.pop();
	mValid = true;
	}

	// Update internal data structures
	if (LIKELY(mValid)) {
	CHECK_EQ(mBuffer.size(), mWindow);
	update_mean();
	update_std();
	if (UNLIKELY(detect(&perf))) {
	mStall = true;
	add_disk_stats(&inc, &mAccumulate);
	log_debug_disk_perf(&mMean, "stalled_mean");
	log_debug_disk_perf(&mStd, "stalled_std");
	} else {
	if (mStall) {
	struct disk_perf acc_perf = get_disk_perf(&mAccumulate);
	log_debug_disk_perf(&acc_perf, "stalled");
	log_event_disk_stats(&mAccumulate, "stalled");
	mStall = false;
	memset(&mAccumulate, 0, sizeof(mAccumulate));
	}
	}
	}

	mPrevious = *curr;
	}

	void disk_stats_monitor::update() {
	disk_stats curr;
	if (mHealth != nullptr) {
	if (!get_disk_stats_from_health_hal(mHealth, &curr)) {
	return;
	}
	} else {
	if (!parse_disk_stats(DISK_STATS_PATH, &curr)) {
	return;
	}
	}

	update(&curr);
	}

	void disk_stats_monitor::publish(void)
	{
	struct disk_perf perf = get_disk_perf(&mAccumulate_pub);
	log_debug_disk_perf(&perf, "regular");
	log_event_disk_stats(&mAccumulate, "regular");
	// Reset global structures
	memset(&mAccumulate_pub, 0, sizeof(struct disk_stats));
	}