/* * Copyright (c) 2013-2016 Apple Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this * file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_LICENSE_HEADER_END@ */ typedef char *kobject_description_t[512]; #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include long long phys_mem = 0; /* amount of physical memory in bytes */ unsigned int phys_pages = 0; /* number of physical memory pages */ int sleep_seconds = 1; int requested_hysteresis_seconds = 0; boolean_t quiet_mode_on = FALSE; boolean_t simulate_mode_on = FALSE; void *range_start_addr = NULL; void *range_end_addr = NULL; void *range_current_addr = NULL; int start_referencing_pages = 0; int start_allocing_pages = 0; pthread_cond_t reference_pages_condvar = PTHREAD_COND_INITIALIZER; pthread_mutex_t reference_pages_mutex = PTHREAD_MUTEX_INITIALIZER; unsigned int desired_level = 0, desired_percent = 0; unsigned int percent_for_level = 0; int tool_mode = 0; #define TOOL_MODE_FOR_PERCENT 1 #define TOOL_MODE_FOR_LEVEL 2 char random_data[] = "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#define PAGE_OP_ALLOC 0x1 #define PAGE_OP_FREE 0x2 #define USE_WIRED_PAGES_FOR_PERCENT_MODE FALSE #define MAX_RANGE_SIZE 64 * 1024 * 1024 * 1024ULL void print_vm_statistics(void); void munch_for_level(unsigned int, unsigned int); void munch_for_percentage(unsigned int, unsigned int, unsigned int); static void usage(void) { fprintf(stderr, "Usage: memory_pressure [options] []\n" " Allocate memory and wait forever.\n" " Options include:\n" " -l - allocate memory until a low memory notification is received (warn OR critical)\n" " -p - allocate memory until percent free is this (or less)\n" " -s - how long to sleep between checking for a set percent level\n" " -w - don't allocate, just wait until percent free is this then exit\n" " -y - Hysteresis Interval: how long to wait after requested percntage free is reached, before exiting program. Requires the usage of the -p option\n" " -v - print VM statistics every sampling interval\n" " -Q - reduces the tool's output\n" " -S - simulate the system's memory pressure level without applying any real pressure\n" " \n" ); exit(0); } static unsigned int read_sysctl_int(const char* name) { unsigned int var; size_t var_size; int error; var_size = sizeof(var); error = sysctlbyname(name, &var, &var_size, NULL, 0); if( error ) { perror(name); exit(-1); } return var; } static long long read_sysctl_long_long(const char* name) { long long var; size_t var_size; int error; var_size = sizeof(var); error = sysctlbyname(name, &var, &var_size, NULL, 0); if( error ) { perror(name); exit(-1); } return var; } static int get_percent_free(unsigned int* level) { int error; error = memorystatus_get_level((user_addr_t) level); if( error ) { perror("memorystatus_get_level failed:"); exit(-1); } return error; } void print_vm_statistics(void) { unsigned int count = HOST_VM_INFO64_COUNT; kern_return_t ret = 0; vm_statistics64_data_t vm_stat;; if (quiet_mode_on == TRUE) { return; } if ((ret = host_statistics64(mach_host_self(), HOST_VM_INFO64, (host_info64_t)&vm_stat, &count) != KERN_SUCCESS)) { fprintf(stderr, "Failed to get statistics. Error %d\n", ret); } else { printf("\nStats: \n"); printf("Pages free: %llu \n", (uint64_t) (vm_stat.free_count - vm_stat.speculative_count)); printf("Pages purgeable: %llu \n", (uint64_t) (vm_stat.purgeable_count)); printf("Pages purged: %llu \n",(uint64_t) (vm_stat.purges)); printf("\nSwap I/O:\n"); printf("Swapins: %llu \n", (uint64_t) (vm_stat.swapins)); printf("Swapouts: %llu \n", (uint64_t) (vm_stat.swapouts)); printf("\nPage Q counts:\n"); printf("Pages active: %llu \n", (uint64_t) (vm_stat.active_count)); printf("Pages inactive: %llu \n", (uint64_t) (vm_stat.inactive_count)); printf("Pages speculative: %llu \n", (uint64_t) (vm_stat.speculative_count)); printf("Pages throttled: %llu \n", (uint64_t) (vm_stat.throttled_count)); printf("Pages wired down: %llu \n", (uint64_t) (vm_stat.wire_count)); printf("\nCompressor Stats:\n"); printf("Pages used by compressor: %llu \n", (uint64_t) (vm_stat.compressor_page_count)); printf("Pages decompressed: %llu \n", (uint64_t) (vm_stat.decompressions)); printf("Pages compressed: %llu \n", (uint64_t) (vm_stat.compressions)); printf("\nFile I/O:\n"); printf("Pageins: %llu \n", (uint64_t) (vm_stat.pageins)); printf("Pageouts: %llu \n", (uint64_t) (vm_stat.pageouts)); #if 0 printf("\"Translation faults\": %llu \n", (uint64_t) (vm_stat.faults)); printf("Pages copy-on-write: %llu \n", (uint64_t) (vm_stat.cow_faults)); printf("Pages zero filled: %llu \n", (uint64_t) (vm_stat.zero_fill_count)); printf("Pages reactivated: %llu \n", (uint64_t) (vm_stat.reactivations)); #endif printf("\n"); } } /* this will work for up to 64 TB of RAM -- beyond that we exceed Intel's max for VRAM (48 bits of addressable space). By the time we get there Intel probably will have increased this */ static unsigned long long get_max_range_size() { unsigned long long the_max_range_size = MAX_RANGE_SIZE; if (phys_mem * 4 > the_max_range_size) { the_max_range_size = phys_mem * 4; } return the_max_range_size; } static int reached_or_bypassed_desired_result(void) { if (tool_mode == TOOL_MODE_FOR_LEVEL) { unsigned int current_level = 0; current_level = read_sysctl_int("kern.memorystatus_vm_pressure_level"); if (desired_level > 0 && current_level >= desired_level) { return 1; } return 0; } if (tool_mode == TOOL_MODE_FOR_PERCENT) { unsigned int current_percent = 0; get_percent_free(¤t_percent); if (desired_percent > 0 && current_percent <= desired_percent) { return 1; } return 0; } return 0; } static void reference_pages(int level) { int error; void *addr = NULL; int num_pages = 0; error = pthread_mutex_lock(&reference_pages_mutex); addr = range_start_addr; again: while(start_referencing_pages == 0) { error = pthread_cond_wait(&reference_pages_condvar, &reference_pages_mutex); } start_allocing_pages = 0; pthread_mutex_unlock(&reference_pages_mutex); num_pages = 0; for(; addr < range_current_addr;) { char p; if (reached_or_bypassed_desired_result()) { //printf("stopped referencing after %d pages\n", num_pages); break; } p = *(char*) addr; addr += PAGE_SIZE; num_pages++; } //if (num_pages) { // printf("Referenced %d\n", num_pages); //} error = pthread_mutex_lock(&reference_pages_mutex); start_referencing_pages = 0; start_allocing_pages = 1; goto again; } static void process_pages(int num_pages, int page_op) { if (num_pages > 0) { int error = 0, i = 0; size_t size = num_pages * PAGE_SIZE; if (page_op == PAGE_OP_ALLOC) { if (tool_mode == TOOL_MODE_FOR_PERCENT && USE_WIRED_PAGES_FOR_PERCENT_MODE) { error = mlock(range_current_addr, size); if (error == -1) { perror("Failed to lock memory!"); exit(-1); } memset(range_current_addr, 0xFF, size); range_current_addr += size; } else { pthread_mutex_lock(&reference_pages_mutex); while (start_allocing_pages == 0) { pthread_mutex_unlock(&reference_pages_mutex); sleep(1); pthread_mutex_lock(&reference_pages_mutex); } pthread_mutex_unlock(&reference_pages_mutex); for (i=0; i < num_pages; i++) { if (reached_or_bypassed_desired_result()) { //printf("stopped faulting after %d pages\n", i); break; } if ((uintptr_t)range_current_addr < get_max_range_size()) { memcpy(range_current_addr, random_data, PAGE_SIZE); range_current_addr += PAGE_SIZE; } else { printf("\nRun out of allocable memory\n"); exit(0); } } pthread_mutex_lock(&reference_pages_mutex); start_referencing_pages = 1; pthread_cond_signal(&reference_pages_condvar); pthread_mutex_unlock(&reference_pages_mutex); } } else { if (tool_mode == TOOL_MODE_FOR_PERCENT && USE_WIRED_PAGES_FOR_PERCENT_MODE) { error = munlock(range_current_addr, size); if (error == -1) { perror("Failed to unlock memory!"); exit(-1); } error = madvise(range_current_addr, size, MADV_FREE); if (error == -1) { perror("Failed to madv_free memory!"); exit(-1); } range_current_addr -= size; } else { pthread_mutex_lock(&reference_pages_mutex); while (start_referencing_pages == 1) { pthread_mutex_unlock(&reference_pages_mutex); sleep(1); pthread_mutex_lock(&reference_pages_mutex); } error = madvise(range_current_addr, size, MADV_FREE); if (error == -1) { perror("Failed to madv_free memory!"); exit(-1); } range_current_addr -= size; start_referencing_pages = 1; pthread_cond_signal(&reference_pages_condvar); pthread_mutex_unlock(&reference_pages_mutex); } } } } void munch_for_level(unsigned int sleep_seconds, unsigned int print_vm_stats) { unsigned int current_level = 0; unsigned int desired_percent = 0; unsigned int current_percent = 0; unsigned int page_op = PAGE_OP_ALLOC; unsigned int previous_page_op = PAGE_OP_ALLOC; unsigned int pages_to_process = 0; unsigned int stabilized_percentage = 0; boolean_t print_vm_stats_on_page_processing = FALSE; boolean_t ok_to_print_stablity_message = TRUE; current_level = read_sysctl_int("kern.memorystatus_vm_pressure_level"); if (current_level >= desired_level) { return; } get_percent_free(¤t_percent); if (print_vm_stats) { print_vm_stats_on_page_processing = TRUE; } page_op = PAGE_OP_ALLOC; previous_page_op = 0; while (1) { if (current_percent > percent_for_level) { desired_percent = current_percent - percent_for_level; } else { desired_percent = 1; } pages_to_process = (desired_percent * phys_pages) / 100; page_op = PAGE_OP_ALLOC; if (previous_page_op != page_op) { //printf("%s %d pages.\n", (page_op == PAGE_OP_ALLOC) ? "Allocating" : "Freeing", pages_to_process); printf("\nCMD: %s pages to go from level: %d to level: %d", (page_op == PAGE_OP_ALLOC) ? "Allocating" : "Freeing", current_level, desired_level); previous_page_op = page_op; fflush(stdout); } else { printf("."); fflush(stdout); } if (print_vm_stats_on_page_processing == TRUE) { print_vm_statistics(); } process_pages(pages_to_process, page_op); ok_to_print_stablity_message = TRUE; current_level = read_sysctl_int("kern.memorystatus_vm_pressure_level"); if (current_level >= desired_level) { while(1) { current_level = read_sysctl_int("kern.memorystatus_vm_pressure_level"); if (current_level < desired_level) { break; } if (current_level > desired_level) { page_op = PAGE_OP_FREE; get_percent_free(¤t_percent); if (stabilized_percentage > current_percent) { pages_to_process = ((stabilized_percentage - current_percent) * phys_pages) / 100; if (previous_page_op != page_op) { printf("\nCMD: %s pages to go from %d to %d level", (page_op == PAGE_OP_ALLOC) ? "Allocating" : "Freeing", current_level, desired_level); previous_page_op = page_op; fflush(stdout); } else { printf("."); fflush(stdout); } if (print_vm_stats_on_page_processing == TRUE) { print_vm_statistics(); } process_pages(pages_to_process, page_op); ok_to_print_stablity_message = TRUE; } } while (current_level == desired_level) { get_percent_free(¤t_percent); if (ok_to_print_stablity_message == TRUE) { print_vm_statistics(); printf("\nStabilizing at Percent: %d Level: %d", current_percent, current_level); fflush(stdout); ok_to_print_stablity_message = FALSE; previous_page_op = 0; } else { printf("."); fflush(stdout); } stabilized_percentage = current_percent; sleep(sleep_seconds); current_level = read_sysctl_int("kern.memorystatus_vm_pressure_level"); } } } get_percent_free(¤t_percent); //printf("Percent: %d Level: %d\n", current_percent, current_level); sleep(1); if (print_vm_stats) { print_vm_stats_on_page_processing = TRUE; } } /* while */ } void munch_for_percentage(unsigned int sleep_seconds, unsigned int wait_percent_free, unsigned int print_vm_stats) { int total_pages_allocated = 0; int current_stable_timer = 0; /* in seconds */ unsigned int current_percent = 0; boolean_t page_op = PAGE_OP_FREE; unsigned int pages_to_process = 0; boolean_t print_vm_stats_on_page_processing = FALSE; boolean_t previous_page_op = 0; boolean_t ok_to_print_stablity_message = TRUE; /* Allocate until memory level is hit. */ get_percent_free(¤t_percent); /* * "wait" mode doesn't alloc, it just waits and exits. This is used * while waiting for *other* processes to allocate memory. */ if (wait_percent_free) { while (current_percent > wait_percent_free) { sleep(sleep_seconds); get_percent_free (¤t_percent); } return; } page_op = PAGE_OP_ALLOC; previous_page_op = 0; while (1) { if (current_percent > desired_percent) { pages_to_process = ((current_percent - desired_percent) * phys_pages) / 100; page_op = PAGE_OP_ALLOC; } else { pages_to_process = ((desired_percent - current_percent) * phys_pages) / 100; page_op = PAGE_OP_FREE; } if (pages_to_process > 0) { if (page_op != previous_page_op) { //printf("\n%s %d pages to go from %d%% to %d%% pages free\n", (page_op == PAGE_OP_ALLOC) ? "Allocating" : "Freeing", pages_to_process, current_percent, desired_percent); printf("\nCMD: %s pages to go from %d%% to %d%% percent free", (page_op == PAGE_OP_ALLOC) ? "Allocating" : "Freeing", current_percent, desired_percent); fflush(stdout); previous_page_op = page_op; } else { printf("."); fflush(stdout); } if (page_op == PAGE_OP_ALLOC) { total_pages_allocated += pages_to_process; process_pages(pages_to_process, page_op); ok_to_print_stablity_message = TRUE; } else { if (total_pages_allocated >= pages_to_process) { total_pages_allocated -= pages_to_process; process_pages(pages_to_process, page_op); ok_to_print_stablity_message = TRUE; } else { get_percent_free(¤t_percent); if (ok_to_print_stablity_message == TRUE) { printf("\nDesired Percent: %d, Current Percent: %d. No pages to free so waiting", desired_percent, current_percent); fflush(stdout); ok_to_print_stablity_message = FALSE; } } } //printf("kernel memorystatus: %d%% free, allocated %d pages total. Requested: %d\n", current_percent, total_pages_allocated, desired_percent); if (print_vm_stats) { print_vm_stats_on_page_processing = TRUE; } } else { if (ok_to_print_stablity_message == TRUE) { print_vm_statistics(); printf("\nStable at percent free: %d", current_percent); fflush(stdout); ok_to_print_stablity_message = FALSE; } else { printf("."); fflush(stdout); } /* Stability has been reached; Increment current_stable_timer by sleep_seconds */ if (current_stable_timer <= requested_hysteresis_seconds){ current_stable_timer += sleep_seconds; /* Debug only */ /* printf("\n Percentage Free stable for %d seconds", current_stable_timer); */ } else { printf ("\n Maintained memory pressure to %d percent free for more than %d seconds. Stopping pressure now.", current_percent, requested_hysteresis_seconds); return; } print_vm_stats_on_page_processing = FALSE; } if (print_vm_stats_on_page_processing) { print_vm_statistics(); if (print_vm_stats_on_page_processing == TRUE) { print_vm_stats_on_page_processing = FALSE; } } sleep(sleep_seconds); get_percent_free(¤t_percent); } /* while */ } int main(int argc, char * const argv[]) { int opt; unsigned int wait_percent_free = 0; unsigned int current_percent = 0; unsigned int print_vm_stats = 0; char level[10]; while ((opt = getopt(argc, argv, "hl:p:s:w:y:vQS")) != -1) { switch (opt) { case 'h': usage(); break; case 'l': strlcpy(level, optarg, 9); if (strncasecmp(level, "normal", 6) == 0) { desired_level = DISPATCH_MEMORYPRESSURE_NORMAL; percent_for_level = 90; } else if (strncasecmp(level, "warn", 4) == 0) { desired_level = DISPATCH_MEMORYPRESSURE_WARN; percent_for_level = 60; } else if (strncasecmp(level, "critical", 8) == 0) { desired_level = DISPATCH_MEMORYPRESSURE_CRITICAL; percent_for_level = 30; } else { printf("Incorrect level. Allowed \"normal\" or \"warn\" or \"critical\". Specified: %s\n", level); exit(0); } break; case 'p': desired_percent = atoi(optarg); break; case 's': sleep_seconds = atoi(optarg); break; case 'w': wait_percent_free = atoi(optarg); break; case 'y': requested_hysteresis_seconds = atoi(optarg); break; case 'v': print_vm_stats = 1; break; case 'Q': quiet_mode_on = TRUE; break; case 'S': simulate_mode_on = TRUE; break; default: usage(); } } if (simulate_mode_on == TRUE && desired_level == 0) { printf("Expected level with -l along with \"simulated\" mode.\n"); return 0; } if (requested_hysteresis_seconds > 0) { if (desired_percent == 0) { printf("Hysteresis time may only be specified in conjunction with a non-zero value for the -p option. \n"); usage(); } } phys_mem = read_sysctl_long_long("hw.memsize"); phys_pages = (unsigned int) (phys_mem / PAGE_SIZE); printf("The system has %lld (%d pages with a page size of %lu).\n", phys_mem, phys_pages, PAGE_SIZE); print_vm_statistics(); get_percent_free(¤t_percent); printf("System-wide memory free percentage: %d%%\n", current_percent); if (desired_percent == 0 && wait_percent_free == 0 && desired_level == 0) { return 0; } if (simulate_mode_on == TRUE) { /* We use the sysctl "kern.memorypressure_manual_trigger" for this mode. Here's a blurb: Supported behaviors when using the manual trigger tests. #define TEST_LOW_MEMORY_TRIGGER_ONE 1 most suitable app is notified #define TEST_LOW_MEMORY_TRIGGER_ALL 2 all apps are notified #define TEST_PURGEABLE_TRIGGER_ONE 3 #define TEST_PURGEABLE_TRIGGER_ALL 4 #define TEST_LOW_MEMORY_PURGEABLE_TRIGGER_ONE 5 #define TEST_LOW_MEMORY_PURGEABLE_TRIGGER_ALL 6 So, for example, to simulate one app getting a poke when the "pressure" reaches critical levels: "sudo sysctl -w kern.memorypressure_manual_trigger = level" where level is calculated as: ((TEST_LOW_MEMORY_TRIGGER_ONE << 16) | NOTE_MEMORYSTATUS_PRESSURE_CRITICAL), which will be "65540". For this tool, currently, we only support the "TEST_LOW_MEMORY_PURGEABLE_TRIGGER_ALL" options. */ #define TEST_LOW_MEMORY_PURGEABLE_TRIGGER_ALL 6 unsigned int var = 0; size_t var_size = 0; int error = 0; var_size = sizeof(var); var = ((TEST_LOW_MEMORY_PURGEABLE_TRIGGER_ALL << 16) | desired_level); error = sysctlbyname("kern.memorypressure_manual_trigger", NULL, 0, &var, var_size); if(error) { perror("sysctl: kern.memorypressure_manual_trigger failed "); exit(-1); } printf("Waiting %d seconds before resetting system state\n", sleep_seconds); sleep(sleep_seconds); var_size = sizeof(var); var = ((TEST_LOW_MEMORY_PURGEABLE_TRIGGER_ALL << 16) | DISPATCH_MEMORYPRESSURE_NORMAL); error = sysctlbyname("kern.memorypressure_manual_trigger", NULL, 0, &var, var_size); if(error) { perror("sysctl: kern.memorypressure_manual_trigger failed "); exit(-1); } printf("Reset system state\n"); } else { range_start_addr = mmap(NULL, get_max_range_size(), PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, 0, 0); if (range_start_addr == MAP_FAILED) { perror("mmap failed"); } else { int error = 0; pthread_t thread = NULL; error = pthread_create(&thread, NULL, (void*) reference_pages, NULL); range_current_addr = range_start_addr; range_end_addr = range_start_addr + get_max_range_size(); start_allocing_pages = 1; if (desired_level) { tool_mode = TOOL_MODE_FOR_LEVEL; munch_for_level(sleep_seconds, print_vm_stats); } else { tool_mode = TOOL_MODE_FOR_PERCENT; munch_for_percentage(sleep_seconds, wait_percent_free, print_vm_stats); } } } return 0; }