RE: [PATCH] mm: add parameter to disable faultaround

["Chanho Min" <chanho.min@lge.com>]

> > The faultaround improves the file read performance, whereas pages which
> > can be dropped by drop_caches are reduced. On some systems, The amount of
> > freeable pages under memory pressure is more important than read
> > performance.
> 
> The faultaround pages *are* freeable.  Perhaps you meant "free" here.
> 
> Please tell us a great deal about the problem which you are trying to
> solve.  What sort of system, what sort of workload, what is bad about
> the behaviour which you are observing, etc.

We are trying to solve two issues.

We drop page caches by writing to /proc/sys/vm/drop_caches at specific point
and make suspend-to-disk image. The size of this image is increased if faultaround
is worked.

Under memory pressure, we want to drop many page caches as possible.
But, The number of dropped pages are reduced compared to non-faultaround kernel.

Thanks
Chanho,


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