Re: [PATCH] mm: readahead: get back a sensible upper limit

[Rafael Aquini <aquini@redhat.com>]

On Tue, Feb 24, 2015 at 01:56:25PM -0800, Linus Torvalds wrote:
> On Tue, Feb 24, 2015 at 4:58 AM, Rafael Aquini <aquini@redhat.com> wrote:
> >
> > This patch brings back the old behavior of max_sane_readahead()
> 
> Yeah no.
> 
> There was a reason that code was killed. No way in hell are we
> bringing back the insanities with node memory etc.
>

Would you consider bringing it back, but instead of node memory state,
utilizing global memory state instead?
 
> Also, we have never actually heard of anything sane that actualyl
> depended on this. Last time this came up it was a made-up benchmark,
> not an actual real load that cared.
> 
> Who can possibly care about this in real life?
> 
People filing bugs complaining their applications that memory map files
are getting hurt by it.

-- Rafael

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