svn commit: r280308 - head/sys/fs/devfs

[Kubilay Kocak]

On 21/03/2015 12:14 PM, Xin LI wrote:
> Author: delphij
> Date: Sat Mar 21 01:14:11 2015
> New Revision: 280308
> URL: https://svnweb.freebsd.org/changeset/base/280308
> 
> Log:
>   Disable timestamping on devfs read/write operations by default.
>   
>   Currently we update timestamps unconditionally when doing read or
>   write operations.  This may slow things down on hardware where
>   reading timestamps is expensive (e.g. HPET, because of the default
>   vfs.timestamp_precision setting is nanosecond now) with limited
>   benefit.
>   
>   A new sysctl variable, vfs.devfs.dotimes is added, which can be
>   set to non-zero value when the old behavior is desirable.

Perhaps *devfs_timestamp_update* is a better name. thoughts?

If something shorter is desired: devfs_ts_update might be ok, though I
prefer the former.

Let's not forget these are user visible system control knobs, not just
code variables, though I do understand the desire to shorten them, and
that we do have descriptions for them ... mostly :)

koobs