Messages in this thread | | | From | David Howells <> | Subject | Re: Do we need to unrevert "fs: do not prefault sys_write() user buffer pages"? | Date | Tue, 22 Jun 2021 18:55:33 +0100 |
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Linus Torvalds <torvalds@linux-foundation.org> wrote:
> End result: doing the fault_in_readable "unnecessarily" at the > beginning is likely the better optimization. It's basically free when > it's not necessary, and it avoids an extra fault (and extra > lock/unlock and retry) when it does end up faulting pages in.
It may also cause the read in to happen in the background whilst write_begin is being done.
David
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