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    SubjectRe: 2.6.16-rc6-mm2
    Date
    Andi Kleen (on 12 Jun 2006 14:14:09 +0200) wrote:
    >Ingo Molnar <mingo@elte.hu> writes:
    >
    >> * Ingo Molnar <mingo@elte.hu> wrote:
    >>
    >> >
    >> > * Christoph Lameter <clameter@sgi.com> wrote:
    >> >
    >> > > Sorry that patch was still against mm1. Here is a fixed up version
    >> > > that applies cleanly against mm2:
    >> >
    >> > i have applied both patches you sent in this thread but it still
    >> > triggers tons of messages:
    >>
    >> > trying to fix it i realized that i'd have to touch tons of
    >> > architectures, which all duplicate this piece of code:
    >>
    >> below is an updated patch that includes fixups for i386 - but the real
    >> fix should be to properly reduce the per-arch local.h footprint to the
    >> bare minimum possible, and to do this fix on the asm-generic headers.
    >
    >I think an even better approach would be to use local_save_flags() /
    >local_restore_flags () and then use a normal increment and get
    >rid of smp_processor_id completely.
    >
    >I've never seen any evidence that the complex and bloated code generated by
    >this is any better that just enabling/disabling interrupts.
    >
    >In the x86 world P4 has costly cli/sti, but I wouldn't expect
    >that problem to be very widespread.

    I have previously suggested a lightweight solution that pins a process
    to a cpu for the short duration that it accesses cpu local variables.
    http://lkml.org/lkml/2005/12/16/2. Time to revistit that option?

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