Messages in this thread | | | Date | Thu, 8 Apr 2004 20:18:38 +0200 | From | Andrea Arcangeli <> | Subject | Re: [parisc-linux] rmap: parisc __flush_dcache_page |
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On Thu, Apr 08, 2004 at 01:07:31PM -0500, James Bottomley wrote: > On Thu, 2004-04-08 at 12:51, Andrea Arcangeli wrote: > > that path can take as long as timeslice to run, not taking interrupts > > for a whole scheduler timeslice is pretty bad. > > OK, now I'm confused. Where's the whole timeslice bit coming from? the > parisc flush_dcache_code better not take a timeslice to execute > otherwise we're in very serious performance trouble. > > Does it take as long as a timeslice to do mmap[_shared] list insertion?
it enterely depends on the workload. On a desktop machine there may be only some hundred entries in those lists at maximum with glibc being the biggest offender:
cat /proc/*/maps | grep libc.so.6 | wc -l
with shared memory on some server there can be easily several thousand entries for some inode even on 64bit, but a timeslice was probably exaggerated (the timeslice was for the walking of the ptes in each mapping too, I don't think you need to look at every pte). - 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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