On Fri, Feb 26, 2021 at 04:03:54PM +, Matthew Wilcox wrote:
> On Fri, Feb 26, 2021 at 10:42:00AM -0400, Jason Gunthorpe wrote:
> > On Thu, Feb 25, 2021 at 08:58:20PM +, Matthew Wilcox wrote:
> >
> > > I'd like to hear better ideas than this.
> >
> > You didn't like my suggestion to put a
On Thu, 25 Feb 2021 20:58:20 +
Matthew Wilcox wrote:
> In order to walk the page tables without the mmap semaphore, it must
> be possible to prevent them from being freed and reused (eg if munmap()
> races with viewing /proc/$pid/smaps).
>
> There is various commentary within the mm on how t
On Fri, Feb 26, 2021 at 10:42:00AM -0400, Jason Gunthorpe wrote:
> On Thu, Feb 25, 2021 at 08:58:20PM +, Matthew Wilcox wrote:
>
> > I'd like to hear better ideas than this.
>
> You didn't like my suggestion to put a sleepable lock around the
> freeing of page tables during flushing?
>
> I s
On Thu, Feb 25, 2021 at 08:58:20PM +, Matthew Wilcox wrote:
> I'd like to hear better ideas than this.
You didn't like my suggestion to put a sleepable lock around the
freeing of page tables during flushing?
I still don't see how you convert the sleepable page walkers to use
rcu??
Jason
In order to walk the page tables without the mmap semaphore, it must
be possible to prevent them from being freed and reused (eg if munmap()
races with viewing /proc/$pid/smaps).
There is various commentary within the mm on how to prevent this. One way
is to disable interrupts, relying on that to
