Commit Graph

7 Commits

Author SHA1 Message Date
Konstantin Belousov
0f502d1c4e Promote ksyms_map() and ksyms_unmap() to general facility
copyout_map() and copyout_unmap() interfaces.

Submitted by:	John Wehle <john feith com>, nox
MFC after:	2 weeks
2011-03-28 12:48:33 +00:00
Matthew D Fleming
13434232a6 Remove the uio_yield prototype and symbol. This function has been
misnamed since it was introduced and should not be globally exposed
with this name.  The equivalent functionality is now available using
kern_yield(curthread->td_user_pri).  The function remains
undocumented.

Bump __FreeBSD_version.
2011-02-08 00:36:46 +00:00
Matthew D Fleming
e7ceb1e99b Based on discussions on the svn-src mailing list, rework r218195:
- entirely eliminate some calls to uio_yeild() as being unnecessary,
   such as in a sysctl handler.

 - move should_yield() and maybe_yield() to kern_synch.c and move the
   prototypes from sys/uio.h to sys/proc.h

 - add a slightly more generic kern_yield() that can replace the
   functionality of uio_yield().

 - replace source uses of uio_yield() with the functional equivalent,
   or in some cases do not change the thread priority when switching.

 - fix a logic inversion bug in vlrureclaim(), pointed out by bde@.

 - instead of using the per-cpu last switched ticks, use a per thread
   variable for should_yield().  With PREEMPTION, the only reasonable
   use of this is to determine if a lock has been held a long time and
   relinquish it.  Without PREEMPTION, this is essentially the same as
   the per-cpu variable.
2011-02-08 00:16:36 +00:00
Matthew D Fleming
08b163fa51 Put the general logic for being a CPU hog into a new function
should_yield().  Use this in various places.  Encapsulate the common
case of check-and-yield into a new function maybe_yield().

Change several checks for a magic number of iterations to use
should_yield() instead.

MFC after:	1 week
2011-02-02 16:35:10 +00:00
Alan Cox
3c4a24406b Push down the page queues into vm_page_cache(), vm_page_try_to_cache(), and
vm_page_try_to_free().  Consequently, push down the page queues lock into
pmap_enter_quick(), pmap_page_wired_mapped(), pmap_remove_all(), and
pmap_remove_write().

Push down the page queues lock into Xen's pmap_page_is_mapped().  (I
overlooked the Xen pmap in r207702.)

Switch to a per-processor counter for the total number of pages cached.
2010-05-08 20:34:01 +00:00
Alan Cox
5ac59343be Acquire the page lock around all remaining calls to vm_page_free() on
managed pages that didn't already have that lock held.  (Freeing an
unmanaged page, such as the various pmaps use, doesn't require the page
lock.)

This allows a change in vm_page_remove()'s locking requirements.  It now
expects the page lock to be held instead of the page queues lock.
Consequently, the page queues lock is no longer required at all by callers
to vm_page_rename().

Discussed with: kib
2010-05-05 18:16:06 +00:00
Ed Schouten
28993443b4 Decompose the most lousy named file in sys/kern; kern_subr.c.
Although this file has historically been used as a dumping ground for
random functions, nowadays it only contains functions related to copying
bits {from,to} userspace and hash table utility functions.

Behold, subr_uio.c and subr_hash.c.
2010-02-21 19:53:33 +00:00