Re: xdr nfs highmem deadlock fix [Re: filesystem access slowing system to a crawl]

[Jeff Garzik]

On Thu, Feb 20, 2003 at 11:56:14PM +0100, Trond Myklebust wrote:
> >>>>> " " == Andrea Arcangeli <[e-mail]> writes:
> 
>      > 2.5.62 has the very same deadlock condition in xdr triggered by
>      >        nfs too.
>      > Andrew, if you're forward porting it yourself like with the
>      > filebacked vma merging feature just let me know so we make sure
>      > not to duplicate effort.
> 
> For 2.5.x we should rather fix MSG_MORE so that it actually works
> instead of messing with hacks to kmap().
> 
> For 2.4.x, Hirokazu Takahashi had a patch which allowed for a safe
> kmap of > 1 page in one call. Appended here as an attachment FYI
> (Marcelo do *not* apply!).

One should also consider kmap_atomic...  (bcrl suggest)

	Jeff