Re: [PATCH] reusing of mapping page supplies a way for file page allocation under low memory due to pagecache over size and is controlled by sysctl parameters. it is used only for rw page allocation rather than fault or readahead allocation. it is like relclaim but is lighter than reclaim. it only reuses clean and zero mapcount pages of mapping. for special filesystems using this feature like below:

[Michal Hocko <mhocko@xxxxxxxxxx>]

On Tue 31-05-16 17:08:22, zhouxianrong@xxxxxxxxxx wrote:
> From: z00281421 <z00281421@xxxxxxxxxxxxxxxxxxxx>
> 
> const struct address_space_operations special_aops = {
>     ...
> 	.reuse_mapping_page = generic_reuse_mapping_page,
> }

Please try to write a proper changelog which explains what is the
change, why do we need it and who is it going to use.
-- 
Michal Hocko
SUSE Labs
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