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Linux: Add structs + wrapper for cachestat

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Stephen Gregoratto 2023-11-17 15:21:57 +11:00
parent ac3bc27938
commit e2cea413fc
2 changed files with 81 additions and 0 deletions
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47
libc/calls/cachestat.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/cachestat.h"
#include "libc/intrin/strace.internal.h"
int sys_cachestat(int, struct cachestat_range *, struct cachestat *, uint32_t);
/**
* Query the page cache statistics of a file.
*
* @param fd The open file descriptor to retrieve statistics from.
* @param cstat_range The byte range in `fd` to query. When `len > 0`, the range
* is `[off..off + len]`. When `len` == 0, the range is from `off` to the end of
* `fd`.
* @param cstat The structure where page cache statistics are stored.
* @param flags Currently unused, and must be set to `0`.
* @return 0 on success, or -1 w/ errno.
* @raise EFAULT if `cstat_range` or `cstat` points to invalid memory
* @raise EINVAL if `flags` is nonzero
* @raise EBADF if `fd` is negative or not open
* @raise EOPNOTSUPP if `fd` refers to a hugetlbfs file
* @raise ENOSYS if not Linux 6.5
*/
int cachestat(int fd, struct cachestat_range *cstat_range,
struct cachestat *cstat, uint32_t flags) {
int rc;
rc = sys_cachestat(fd, cstat_range, cstat, flags);
STRACE("cachestat(%d, %p, %p, %#x) → %d% m", fd, cstat_range, cstat, flags);
return rc;
}

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libc/calls/cachestat.h Normal file
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#ifndef COSMOPOLITAN_LIBC_CALLS_CACHESTAT_H_
#define COSMOPOLITAN_LIBC_CALLS_CACHESTAT_H_
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
struct cachestat_range {
uint64_t off;
uint64_t len;
};
struct cachestat {
/** Number of cached pages. */
uint64_t nr_cache;
/** Number of dirty pages */
uint64_t nr_dirty;
/** Number of pages marked for writeback. */
uint64_t nr_writeback;
/** Number of pages evicted from the cache. */
uint64_t nr_evicted;
/**
* Number of recently evicted pages.
* A page is recently evicted if its last eviction was recent enough that its
* reentry to the cache would indicate that it is actively being used by the
* system, and that there is memory pressure on the system.
*/
uint64_t nr_recently_evicted;
};
int cachestat(int, struct cachestat_range *, struct cachestat *, uint32_t);
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_CALLS_LANDLOCK_H_ */