cvs commit: src/sys/kern kern_synch.c src/sys/sys proc.h
src/sys/i386/i386 genassym.c pmap.c swtch.s src/sys/i386/include
jroberson at chesapeake.net
Tue Sep 30 01:20:14 PDT 2003
This improved my 'make kernel' times by 2%. The effect was less with
buildkernel since we spent so much of our time waiting on IO, etc. For an
operation like pmap_zero_page() the TLB flush is probably half of the cost
of the function.
On Tue, 30 Sep 2003, Jeff Roberson wrote:
> jeff 2003/09/30 01:11:36 PDT
> FreeBSD src repository
> Modified files:
> sys/kern kern_synch.c
> sys/sys proc.h
> sys/i386/i386 genassym.c pmap.c swtch.s
> sys/i386/include pcb.h
> - On my Pentium4-M laptop, invalpg takes ~1100 cycles if the page is found in
> the TLB and ~1600 if it is not. Therefore, it is more effecient to
> invalidate the TLB after operations that use CMAP rather than before.
> - So that the tlb is invalidated prior to switching off of a processor, we
> must change the switchin functions to switchout functions.
> - Remove td_switchout from the thread and move it to the x86 pcb.
> - Move the code that calls switchout into swtch.s. These changes make this
> optimization truely x86 specific.
> Revision Changes Path
> 1.143 +1 -1 src/sys/i386/i386/genassym.c
> 1.438 +33 -33 src/sys/i386/i386/pmap.c
> 1.143 +6 -1 src/sys/i386/i386/swtch.s
> 1.50 +2 -1 src/sys/i386/include/pcb.h
> 1.234 +0 -8 src/sys/kern/kern_synch.c
> 1.348 +0 -1 src/sys/sys/proc.h
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