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Merge pull request #21 from oven-sh/jarred/process-constrainedMemory
Read constrained memory and enable `BMALLOC_MEMORY_FOOTPRINT_API` for Bun
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,235 @@ | ||
| // This code is copied from libuv. Thanks to libuv developers. | ||
| /* Copyright Joyent, Inc. and other Node contributors. All rights reserved. | ||
| * Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| * of this software and associated documentation files (the "Software"), to | ||
| * deal in the Software without restriction, including without limitation the | ||
| * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or | ||
| * sell copies of the Software, and to permit persons to whom the Software is | ||
| * furnished to do so, subject to the following conditions: | ||
| * | ||
| * The above copyright notice and this permission notice shall be included in | ||
| * all copies or substantial portions of the Software. | ||
| * | ||
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | ||
| * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | ||
| * IN THE SOFTWARE. | ||
| */ | ||
|
|
||
| #include "BPlatform.h" | ||
| #include <cstdint> | ||
|
|
||
| #if BOS(LINUX) | ||
|
|
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| #ifndef PRIu64 | ||
| #define PRIu64 "lu" | ||
| #endif | ||
|
|
||
| #include <unistd.h> | ||
| #include <fcntl.h> | ||
| #include <string.h> | ||
| #include <climits> | ||
| #include <cerrno> | ||
| #include <cstdio> | ||
| #include <sys/stat.h> | ||
| #include <sys/types.h> | ||
| #include <cstdlib> | ||
| #include <cstdio> | ||
|
|
||
| #ifndef assert | ||
| static inline void assert(bool) | ||
| { | ||
| } | ||
| #endif | ||
|
|
||
| static int uv__open_cloexec(const char* path, int flags) | ||
| { | ||
| int fd; | ||
|
|
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| fd = open(path, flags | O_CLOEXEC, 0); | ||
| if (fd == -1) | ||
| return errno; | ||
|
|
||
| return fd; | ||
| } | ||
|
|
||
| static int uv__close_nocheckstdio(int fd) | ||
| { | ||
| int saved_errno; | ||
| int rc; | ||
|
|
||
| saved_errno = errno; | ||
| rc = close(fd); | ||
| if (rc == -1) { | ||
| if (errno == EINTR || errno == EINPROGRESS) | ||
| rc = 0; /* The close is in progress, not an error. */ | ||
| errno = saved_errno; | ||
| } | ||
|
|
||
| return rc; | ||
| } | ||
|
|
||
| static int uv__slurp(const char* filename, char* buf, size_t len) | ||
| { | ||
| ssize_t n; | ||
| int fd; | ||
|
|
||
| assert(len > 0); | ||
|
|
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| fd = uv__open_cloexec(filename, O_RDONLY); | ||
| if (fd < 0) | ||
| return fd; | ||
|
|
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| do | ||
| n = read(fd, buf, len - 1); | ||
| while (n == -1 && errno == EINTR); | ||
|
|
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| if (uv__close_nocheckstdio(fd)) | ||
| abort(); | ||
|
|
||
| if (n < 0) | ||
| return errno; | ||
|
|
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| buf[n] = '\0'; | ||
|
|
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| return 0; | ||
| } | ||
|
|
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| static uint64_t uv__read_uint64(const char* filename) | ||
| { | ||
| char buf[32]; /* Large enough to hold an encoded uint64_t. */ | ||
| uint64_t rc; | ||
|
|
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| rc = 0; | ||
| if (0 == uv__slurp(filename, buf, sizeof(buf))) | ||
| if (1 != sscanf(buf, "%" PRIu64, &rc)) | ||
| if (0 == strcmp(buf, "max\n")) | ||
| rc = UINT64_MAX; | ||
|
|
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| return rc; | ||
| } | ||
|
|
||
| /* Given a buffer with the contents of a cgroup1 /proc/self/cgroups, | ||
| * finds the location and length of the memory controller mount path. | ||
| * This disregards the leading / for easy concatenation of paths. | ||
| * Returns NULL if the memory controller wasn't found. */ | ||
| static char* uv__cgroup1_find_memory_controller(char buf[1024], | ||
| int* n) | ||
| { | ||
| char* p; | ||
|
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| /* Seek to the memory controller line. */ | ||
| p = strchr(buf, ':'); | ||
| while (p != NULL && strncmp(p, ":memory:", 8)) { | ||
| p = strchr(p, '\n'); | ||
| if (p != NULL) | ||
| p = strchr(p, ':'); | ||
| } | ||
|
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| if (p != NULL) { | ||
| /* Determine the length of the mount path. */ | ||
| p = p + strlen(":memory:/"); | ||
| *n = (int)strcspn(p, "\n"); | ||
| } | ||
|
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| return p; | ||
| } | ||
|
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| static void uv__get_cgroup1_memory_limits(char buf[1024], uint64_t* high, | ||
| uint64_t* max) | ||
| { | ||
| char filename[4097]; | ||
| char* p; | ||
| int n; | ||
| uint64_t cgroup1_max; | ||
|
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| /* Find out where the controller is mounted. */ | ||
| p = uv__cgroup1_find_memory_controller(buf, &n); | ||
| if (p != NULL) { | ||
| snprintf(filename, sizeof(filename), | ||
| "/sys/fs/cgroup/memory/%.*s/memory.soft_limit_in_bytes", n, p); | ||
| *high = uv__read_uint64(filename); | ||
|
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| snprintf(filename, sizeof(filename), | ||
| "/sys/fs/cgroup/memory/%.*s/memory.limit_in_bytes", n, p); | ||
| *max = uv__read_uint64(filename); | ||
|
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| /* If the controller wasn't mounted, the reads above will have failed, | ||
| * as indicated by uv__read_uint64 returning 0. | ||
| */ | ||
| if (*high != 0 && *max != 0) | ||
| goto update_limits; | ||
| } | ||
|
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| /* Fall back to the limits of the global memory controller. */ | ||
| *high = uv__read_uint64("/sys/fs/cgroup/memory/memory.soft_limit_in_bytes"); | ||
| *max = uv__read_uint64("/sys/fs/cgroup/memory/memory.limit_in_bytes"); | ||
|
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| /* uv__read_uint64 detects cgroup2's "max", so we need to separately detect | ||
| * cgroup1's maximum value (which is derived from LONG_MAX and PAGE_SIZE). | ||
| */ | ||
| update_limits: | ||
| cgroup1_max = LONG_MAX & ~(sysconf(_SC_PAGESIZE) - 1); | ||
| if (*high == cgroup1_max) | ||
| *high = UINT64_MAX; | ||
| if (*max == cgroup1_max) | ||
| *max = UINT64_MAX; | ||
| } | ||
|
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| static void uv__get_cgroup2_memory_limits(char buf[1024], uint64_t* high, | ||
| uint64_t* max) | ||
| { | ||
| char filename[4097]; | ||
| char* p; | ||
| int n; | ||
|
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| /* Find out where the controller is mounted. */ | ||
| p = buf + strlen("0::/"); | ||
| n = (int)strcspn(p, "\n"); | ||
|
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| /* Read the memory limits of the controller. */ | ||
| snprintf(filename, sizeof(filename), "/sys/fs/cgroup/%.*s/memory.max", n, p); | ||
| *max = uv__read_uint64(filename); | ||
| snprintf(filename, sizeof(filename), "/sys/fs/cgroup/%.*s/memory.high", n, p); | ||
| *high = uv__read_uint64(filename); | ||
| } | ||
|
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| static uint64_t uv__get_cgroup_constrained_memory(char buf[1024]) | ||
| { | ||
| uint64_t high; | ||
| uint64_t max; | ||
|
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| /* In the case of cgroupv2, we'll only have a single entry. */ | ||
| if (strncmp(buf, "0::/", 4)) | ||
| uv__get_cgroup1_memory_limits(buf, &high, &max); | ||
| else | ||
| uv__get_cgroup2_memory_limits(buf, &high, &max); | ||
|
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| if (high == 0 || max == 0) | ||
| return 0; | ||
|
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| return high < max ? high : max; | ||
| } | ||
|
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| // TODO: should we cache this? can we? | ||
| uint64_t uv_get_constrained_memory() | ||
| { | ||
| char buf[1024]; | ||
|
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| if (uv__slurp("/proc/self/cgroup", buf, sizeof(buf))) | ||
| return 0; | ||
|
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| return uv__get_cgroup_constrained_memory(buf); | ||
| } | ||
|
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| #else | ||
|
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| uint64_t uv_get_constrained_memory() | ||
| { | ||
| return 0; | ||
| } | ||
|
|
||
| #endif |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,3 @@ | ||
| #pragma once | ||
|
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| uint64_t uv_get_constrained_memory(); |