On Mon, Aug 25, 2008 at 4:19 PM, Ed Schouten <ed_at_80386.nl> wrote: > * Kris Kennaway <kris_at_FreeBSD.org> wrote: >> Ed Schouten wrote: >>> Author: ed >>> Date: Sun Aug 24 15:20:44 2008 >>> New Revision: 182109 >>> URL: http://svn.freebsd.org/changeset/base/182109 >>> >>> Log: >>> Make sysmouse(4) use its own locks, instead of using Giant. >>> When I changed syscons(4) to work with the MPSAFE TTY code, I just >>> locked all device nodes down using the compatibility feature that allows >>> you to override the TTY's lock (Giant in this case). Upon closer >>> inspection, it seems sysmouse(4) only has two internal variables that >>> need locking: mouse_level and mouse_status. >>> I haven't done any performance benchmarks on this, though I think >>> it >>> won't have any dramatic improvements on the system. It is good to get >>> rid of Giant here, because the third argument of tty_alloc() has only >>> been added to ease migration to MPSAFE TTY. It should not be used when >>> not needed. >>> While there, remove SC_MOUSE, which is a leftover from the MPSAFE >>> TTY >>> import. >> >> This might help mouse interactivity for desktop users that have legacy >> Giant-locked systems in use (e.g. busy MSDOS filesystems, giant-locked >> disk drivers), etc. > > Yes, but only a very very little bit. moused still delivers the input to > /dev/consolectl, which is still Giant locked. The part where the Xorg > server reads from /dev/sysmouse is now Giant-free. Are you going to lock that one too? I have some problems with a sluggish PS/2 mouse when Firefox runs a heavily javascripted site (though it is way better now that I can use nvidia(4) again without crashing).Received on Tue Aug 26 2008 - 08:28:25 UTC
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