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Add support for POSIX_FADV_DONTNEED

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For now make it only evict the specified data from the dbuf cache.
Even though dbuf cache is small, this may still reduce eviction of
more useful data from there, and slightly accelerate ARC evictions
by making the blocks there evictable a bit sooner.

On FreeBSD this also adds support for POSIX_FADV_NOREUSE, since the
kernel translates it into POSIX_FADV_DONTNEED after every read/write.
This is not as efficient as it could be for ZFS, but that is the only
way FreeBSD kernel allows to handle POSIX_FADV_NOREUSE now.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com>
Closes #18399
This commit is contained in:
Alexander Motin
2026-04-07 11:56:54 -04:00
committed by Tony Hutter
parent 6f14581e1a
commit 4bb7592745
9 changed files with 169 additions and 4 deletions
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module/os/freebsd/zfs/zfs_vnops_os.c
+3 -1
View File
@@ -6748,10 +6748,12 @@ zfs_freebsd_advise(struct vop_advise_args *ap)
dmu_prefetch(os, zp->z_id, 0, start, len,
ZIO_PRIORITY_ASYNC_READ);
break;
case POSIX_FADV_DONTNEED:
dmu_evict_range(os, zp->z_id, start, len);
break;
case POSIX_FADV_NORMAL:
case POSIX_FADV_RANDOM:
case POSIX_FADV_SEQUENTIAL:
case POSIX_FADV_DONTNEED:
case POSIX_FADV_NOREUSE:
/* ignored for now */
break;
module/os/linux/zfs/zpl_file.c
+8 -2
View File
@@ -789,11 +789,17 @@ zpl_fadvise(struct file *filp, loff_t offset, loff_t len, int advice)
}
}
zfs_exit(zfsvfs, FTAG);
#ifdef HAVE_GENERIC_FADVISE
error = generic_fadvise(filp, offset, len, advice);
#endif
if (error == 0 && advice == POSIX_FADV_DONTNEED) {
loff_t rlen = len ? len : i_size_read(ip) - offset;
dmu_evict_range(os, zp->z_id, offset, rlen);
}
zfs_exit(zfsvfs, FTAG);
return (error);
}