Messages in this thread | | | Date | Thu, 29 May 2008 23:37:58 -0700 | From | Andrew Morton <> | Subject | Re: [patch 00/41] cpu alloc / cpu ops v3: Optimize per cpu access |
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On Thu, 29 May 2008 23:22:31 -0700 (PDT) Christoph Lameter <clameter@sgi.com> wrote:
> On Thu, 29 May 2008, Andrew Morton wrote: > > > ext3 maintains three percpu_counters per mount. Each percpu_counter > > does one percpu_alloc. People can mount an arbitrary number of ext3 > > filesystems! > > But its 4 bytes per alloc right?
It could be 4000. The present alloc_percpu() would support that.
And struct nfs_iostats is 264 bytes and nfs does an alloc_percpu() of one of those per server and mounting thousands of servers per client is, I believe, a real-world operation.
Plus for the entyenth time: saying that this code will probably work acceptably for most people in 2.6.26 is not sufficient!
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