diff options
Diffstat (limited to 'sys-utils/swapon.8')
| -rw-r--r-- | sys-utils/swapon.8 | 24 |
1 files changed, 17 insertions, 7 deletions
diff --git a/sys-utils/swapon.8 b/sys-utils/swapon.8 index 385bf5aea..836b17277 100644 --- a/sys-utils/swapon.8 +++ b/sys-utils/swapon.8 @@ -112,15 +112,25 @@ 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" -Discard freed swap pages before they are reused, if the swap -device supports the discard or trim operation. This may improve -performance on some Solid State Devices, but often it does not. +.B "\-d, \-\-discard\fR [=\fIpolicy\fR]" +Enable swap discards, if the swap backing device supports the discard or +trim operation. This may improve performance on some Solid State Devices, +but often it does not. The option allows one to select between two +available swap discard policies: +.BI \-\-discard=once +to perform a single-time discard operation for the whole swap area at swapon; +or +.BI \-\-discard=pages +to discard freed swap pages before they are reused, while swapping. +If no policy is selected, the default behavior is to enable both discard types. The .I /etc/fstab -mount option -.BI discard -may be also used to enable discard flag. +mount options +.BI discard, +.BI discard=once, +or +.BI discard=pages +may be also used to enable discard flags. .TP .B "\-e, \-\-ifexists" Silently skip devices that do not exist. |