Messages in this thread | | | From | Gabriel Devenyi <> | Subject | Re: [ck] Re: Preempt Threshold Measurements | Date | Mon, 12 Jul 2004 23:09:43 -0400 |
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Ah good, thanks for the suggestion on how to improve this... Now, what exactly is that, and where/how do I change it.... (I really should start/finish that "understanding the linux kernel" book of mine)
-- Gabriel Devenyi devenyga@mcmaster.ca
On Monday 12 July 2004 22:55, William Lee Irwin III wrote: > On Mon, Jul 12, 2004 at 10:48:50PM -0400, Gabriel Devenyi wrote: > > Well I'm not particularly educated in kernel internals yet, here's some > > reports from the system when its running. > > 6ms non-preemptible critical section violated 4 ms preempt threshold > > starting at do_munmap+0xd2/0x140 and ending at do_munmap+0xeb/0x140 > > [<c014007b>] do_munmap+0xeb/0x140 > > [<c01163b0>] dec_preempt_count+0x110/0x120 > > [<c014007b>] do_munmap+0xeb/0x140 > > [<c014010f>] sys_munmap+0x3f/0x60 > > [<c0103ee1>] sysenter_past_esp+0x52/0x71 > > Looks like ZAP_BLOCK_SIZE may be too large for you. Lowering that some > may "help" this. It's probably harmless, but try lowering that to half > of whatever it is now, or maybe 64*PAGE_SIZE. It may be worthwhile > to restructure how the preemption points are done in unmap_vmas() so > we don't end up in some kind of tuning nightmare. > > > -- wli > _______________________________________________ > ck@vds.kolivas.org > ck mailing list - unmoderated. Please reply-to-all when posting. > http://bhhdoa.org.au/mailman/listinfo/ck - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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