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| author | Hugh Dickins | 2010-10-25 02:32:47 +0200 |
|---|---|---|
| committer | Karel Zak | 2010-11-01 16:35:31 +0100 |
| commit | c2301380b4d61921971f89661088d1dab7c70ccd (patch) | |
| tree | 249f6a38adda7ec24d70cab99b9f09ac46e613b2 /mount/swapon.8 | |
| parent | rev: use xalloc for memory allocation (diff) | |
| download | kernel-qcow2-util-linux-c2301380b4d61921971f89661088d1dab7c70ccd.tar.gz kernel-qcow2-util-linux-c2301380b4d61921971f89661088d1dab7c70ccd.tar.xz kernel-qcow2-util-linux-c2301380b4d61921971f89661088d1dab7c70ccd.zip | |
swapon: add "discard" support
In kernel 2.6.36 (and in stable kernel 2.6.35.5) I made a tiny change
to the swapon(const char *path, int swapflags) system call interface:
kernel commit 3399446632739fcd05fd8b272b476a69c6e6d14a
swap: discard while swapping only if SWAP_FLAG_DISCARD
As things stand at present, we could just remove the swap discard
support; but since several filesystems (including ext4 and btrfs and
fat) are offering a "discard" mount option, I thought swap should take
the same course, and offer a "--discard" or "-d" option to swapon(8).
[kzak@redhat.com: - update swapon.8 man page
- use for -d the same logic as for -p]
Signed-off-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Karel Zak <kzak@redhat.com>
Diffstat (limited to 'mount/swapon.8')
| -rw-r--r-- | mount/swapon.8 | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/mount/swapon.8 b/mount/swapon.8 index 595198d51..e35c6e5f5 100644 --- a/mount/swapon.8 +++ b/mount/swapon.8 @@ -54,6 +54,7 @@ Enable/disable: .br .in +5 .B swapon +.RB [ \-d ] .RB [ \-f ] .RB [ \-p .IR priority ] @@ -111,6 +112,16 @@ All devices marked as ``swap'' in are made available, except for those with the ``noauto'' option. Devices that are already being used as swap are silently skipped. .TP +.B "\-d, \-\-discard" +Swapping will discard clusters of swap pages in between freeing them +and re-writing to them, if the swap device supports that. +The +.I /etc/fstab +mount option +.BI discard +may be also used to enable discard flag. + +.TP .B "\-e, \-\-ifexists" Silently skip devices that do not exist. The |