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Use POSIX_FADV_NOREUSE to avoid page-cache pollution

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This adds support for POSIX_FADV_NOREUSE, which advises the kernel not to
cache read data. It's available starting from Linux kernel 6.3.
To maintain compatibility with older kernels, POSIX_FADV_DONTNEED is still
used.
This commit is contained in:
Andrea Mazzoleni 2025-05-08 09:18:50 +02:00
parent f38b5a84a8
commit 5ad7f9acfc
1 changed files with 15 additions and 1 deletions
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16
cmdline/support.c
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@ -1002,7 +1002,21 @@ int advise_open(struct advise_struct* advise, int f)
) {
int ret;
/* advise sequential access */
/* advise noreuse access, this avoids to pollute the page cache */
/* supported from Linux Kernel 6.3 with this commit: https://github.com/torvalds/linux/commit/17e810229cb3068b692fa078bd9b3a6527e0866a */
ret = posix_fadvise(f, 0, 0, POSIX_FADV_NOREUSE);
if (ret == ENOSYS) {
/* call is not supported */
ret = 0;
}
if (ret != 0) {
/* LCOV_EXCL_START */
errno = ret; /* posix_fadvise return the error code */
return -1;
/* LCOV_EXCL_STOP */
}
/* advise sequential access, this doubles the read-ahead window size */
ret = posix_fadvise(f, 0, 0, POSIX_FADV_SEQUENTIAL);
if (ret == ENOSYS) {
/* call is not supported, like in armhf, see posix_fadvise manpage */