Re: [PATCH 0/24] make atomic_read() behave consistently across all architectures

[Herbert Xu <herbert@gondor.apana.org.au>]

On Thu, Aug 16, 2007 at 01:48:32PM +1000, Paul Mackerras wrote:
> Herbert Xu writes:
> 
> > If you're referring to the code in sk_stream_mem_schedule
> > then it's working as intended.  The atomicity guarantees
> 
> You mean it's intended that *sk->sk_prot->memory_pressure can end up
> as 1 when sk->sk_prot->memory_allocated is small (less than
> ->sysctl_mem[0]), or as 0 when ->memory_allocated is large (greater
> than ->sysctl_mem[2])?  Because that's the effect of the current code.
> If so I wonder why you bother computing it.

You need to remember that there are three different limits:
minimum, pressure, and maximum.  By default we should never
be in a situation where what you say can occur.

If you set all three limits to the same thing, then yes it
won't work as intended but it's still well-behaved.

Cheers,
-- 
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