mirror of
https://github.com/DeusData/codebase-memory-mcp.git
synced 2026-11-09 09:11:00 +08:00
Sam Li
a5a3d1d60a
Inside a container, sysconf(_SC_NPROCESSORS_ONLN) and sysinfo() report the host's CPU count and RAM, not the cgroup's effective quota — so cbm_default_worker_count over-provisions workers and the mmap budget can exceed the cgroup memory cap, driving OOMKills (#363). detect_system_linux now reads the cgroup limits: - cbm_detect_cgroup_cpus: cgroup v2 cpu.max, then v1 cpu.cfs_quota_us / cpu.cfs_period_us → ceil(quota/period); -1 when unlimited. - cbm_detect_cgroup_mem: cgroup v2 memory.max, then v1 memory.limit_in_bytes; 0 when unlimited or the v1 near-ULLONG_MAX sentinel. - Effective value is min(cgroup, host), guarding against mis-mounted cgroups that report more than the host. Helpers read via a bounded read_small_file (fopen "re", capped fread) and are exposed through system_info_internal.h for unit tests that drive them against a fake cgroup tree. The test teardown uses opendir/unlink/ rmdir (no shell spawn). Distilled from #365 onto current main (unioned the test additions with the CBM_WORKERS tests from #364, and replaced the test-cleanup system("rm -rf") with a shell-free recursive remove). Closes #363 together with #364.
45 lines
1.5 KiB
C
45 lines
1.5 KiB
C
/*
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* system_info_internal.h — Internal helpers exposed for testing.
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*
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* These functions are implementation details of system_info.c; they are
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* declared here only so that test_platform.c can drive them against a
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* fake cgroup filesystem. Production code outside system_info.c should
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* use the public APIs in platform.h instead.
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*/
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#ifndef CBM_FOUNDATION_SYSTEM_INFO_INTERNAL_H
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#define CBM_FOUNDATION_SYSTEM_INFO_INTERNAL_H
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#include <stddef.h>
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#ifdef __linux__
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/*
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* Effective CPU count for the cgroup rooted at `cgroup_root`.
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*
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* Reads (in order):
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* 1. cgroup v2: "<cgroup_root>/cpu.max" ("<quota> <period>" or "max ...")
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* 2. cgroup v1: "<cgroup_root>/cpu/cpu.cfs_quota_us" + ".../cpu.cfs_period_us"
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*
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* Returns ceil(quota / period) (>= 1) when a valid CPU quota is in place.
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* Returns -1 when no cgroup limit is present (caller should fall back to
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* sysconf(_SC_NPROCESSORS_ONLN)).
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*/
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int cbm_detect_cgroup_cpus(const char *cgroup_root);
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/*
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* Effective memory limit (bytes) for the cgroup rooted at `cgroup_root`.
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*
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* Reads (in order):
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* 1. cgroup v2: "<cgroup_root>/memory.max" ("max" or integer bytes)
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* 2. cgroup v1: "<cgroup_root>/memory/memory.limit_in_bytes"
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*
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* Returns the byte count when a finite limit is in place. Returns 0 when
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* no cgroup limit is present, the limit is "max"/unlimited, or the value
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* is so large it represents the cgroup-v1 "unlimited" sentinel.
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*/
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size_t cbm_detect_cgroup_mem(const char *cgroup_root);
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#endif /* __linux__ */
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#endif /* CBM_FOUNDATION_SYSTEM_INFO_INTERNAL_H */
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