Re: [PATCH v2] khugepaged: hold invalidate_lock across collapse_file() readahead

[Mike Rapoport]

On Mon, Sep 14, 2026 at 04:19:11PM +0200, David Hildenbrand (Arm) wrote:
> > 
> > See https://lore.kernel.org/linux-mm/aqbtfms0_2ULBIT7@gremlin/
> > 
> > I am not really entirely happy with somebody who has sent a flurry of patches
> > across disparate subsystems with no previous track record being in charge of a
> > potentially backported fix.
> > 
> > It's David's decision but I think this fix should be taken over by somebody
> > else.
> 
> IIUC, this patch might be responsible for random CI failures (Mike still
> investigating).

Checkout of this commit in mm-unstable [ 1be399d378b78 ("khugepaged: hold
invalidate_lock across collapse_file() readahead") as of a few hours back ]
'khugepaged all:file $XFS_DIR' fails once in 20 or so runs on my machine.

With this commit reverted, 400 iterations didn't fail.

> So I'd prefer if this is taken over by someone familiar with that code.
> 
> @Willy, @Zi, @Lance?
> 
> 
> -- 
> Cheers,
> 
> David

-- 
Sincerely yours,
Mike.