On Thu, Apr 19, 2018 at 10:05:47AM +0100, Dr. David Alan Gilbert wrote: > * Stefan Hajnoczi (stefa...@redhat.com) wrote: > > This commit is for debugging only. Do not merge it. > > > > mincore(2) checks whether pages are resident. Use it to verify that > > page cache has been dropped. > > > > You can trigger a verification failure by mmapping the image file from > > another process and loading a byte from a page so that it becomes > > resident. bdrv_co_invalidate_cache() will fail while the process is > > alive. > > It doesn't seem a bad diagnostic to keep in (with a switch to activate) > for when we're faced with some weird corruption on some weird storage > system.
Okay. It's very slow to mmap an entire image file and query mincore(2) so it needs to be off by default. Stefan
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