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Date:   Thu, 7 May 2020 09:30:55 -0700
From:   Randy Dunlap <>
To:     Anthony Yznaga <>,,
Subject: Re: [RFC 34/43] shmem: PKRAM: multithread preserving and restoring
 shmem pages

On 5/6/20 5:42 PM, Anthony Yznaga wrote:
> Improve performance by multithreading the work to preserve and restore
> shmem pages.
> Add 'pkram_max_threads=' kernel option to specify the maximum number
> of threads to use to preserve or restore the pages of a shmem file.
> The default is 16.

Please document kernel boot options in Documentation/admin-guide/kernel-parameters.txt.

> When preserving pages each thread saves chunks of a file to a pkram_obj
> until no more no more chunks are available.
> When restoring pages each thread loads pages using a copy of a
> pkram_stream initialized by pkram_prepare_load_obj(). Under the hood
> each thread ends up fetching and operating on pkram_link pages.
> Signed-off-by: Anthony Yznaga <>
> ---
>  include/linux/pkram.h |   2 +
>  mm/shmem_pkram.c      | 101 +++++++++++++++++++++++++++++++++++++++++++++++++-
>  2 files changed, 101 insertions(+), 2 deletions(-)


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