Messages in this thread | | | Date | Mon, 28 Jul 2008 11:33:12 -0700 | From | Mike Travis <> | Subject | Re: [PATCH 0/4] x86_64: Optimize percpu accesses |
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Ingo Molnar wrote: > * Mike Travis <travis@sgi.com> wrote: > >> This patchset provides the following: >> >> * x86_64: Cleanup setup_percpu by fixing some minor potential >> problems as well as add some debugging aids. >> >> * x86_64: Rebase per cpu variables to zero >> >> Rebase per cpu variables to zero in preparation for the following >> patch to fold the pda into the per cpu area. >> >> * x86_64: Fold pda into per cpu area >> >> Declare the pda as a per cpu variable. This will allow the per cpu >> variables to be accessible on the x86_64 using %gs as the base of >> the percpu areas for each cpu: >> >> %gs:per_cpu_xxxx >> >> * x86_64: Reference zero-based percpu variables offset from gs >> >> Actually implement the above operation for __get_cpu_var() and >> __put_cpu_var(). Since this is now a single instruction, we >> can remove the non-preemptible versions of x86_read_percpu() >> and x86_write_percpu(). >> >> Note that the following changes are NOT in this patchset as the plan now >> seems to be that the common (to x86) variables that are in the pda should >> be made individual per cpu variables, leaving only the stack canary in place. >> >> * x86_64: Replace cpu_pda ops with percpu ops >> * x86_64: Replace xxx_pda() operations with x86_xxx_percpu(). >> * x86_64: Remove xxx_pda() operations >> * x86_64: Remove cpu_pda() macro >> >> Based on linux-2.6.tip/master. > > i've added these patches to tip/x86/percpu-zerobased, but not yet merged > into tip/master. I've made it -git based - does this patchset have any > functional dependencies on other patches? > > Ingo
I think the other patches have been in place for a while. This was actually patch 3 of about 20 that finalized with the CPU_ALLOC changes. In my tree the 2 prior to this one are:
b3a0cb456d848e10b2f7b371ba05e44f1384520a Subject: Zero based percpu: Infrastructure to rebase the per cpu area to zero
d3794979a8a80c222ce9d016a6dfc4bed36965d0 Subject: x86: Extend percpu ops to 64 bit
Thanks, Mike
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