Messages in this thread | | | Date | Mon, 24 Jan 2000 12:00:50 -0800 (PST) | From | Linus Torvalds <> | Subject | Re: [NFS] New version of Linux NFSv3 client is out... |
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On Mon, 24 Jan 2000, Eric Werme USG wrote: > > The unmount frees all the cached pages, but at substantial cost in > benchmark knowledge, privileges, structure, and cooperation with other > processes trying to the the FS at the same time.
Yes, and needs superuser privileges (which in many cases is not acceptable for a benchmark).
I could certainly add a "flush cache" thing, I just do not think that MS_INVALIDATE is the right thing to do (let's say that you have an application that uses MS_INVALIDATE for the cache coherency reason, then it's a good thing to make it as quick as the OS can).
We have "flush cache" ioctl's for block device accesses, where due to partition table changes our caches can become invalid. It's commonly used for benchmarking too, and I don't think it would be wrong to extend it to normal files..
Linus
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