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Date:   Thu, 7 May 2020 09:30:55 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Anthony Yznaga <anthony.yznaga@...cle.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     willy@...radead.org, corbet@....net, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, x86@...nel.org, hpa@...or.com,
        dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
        rppt@...ux.ibm.com, akpm@...ux-foundation.org, hughd@...gle.com,
        ebiederm@...ssion.com, masahiroy@...nel.org, ardb@...nel.org,
        ndesaulniers@...gle.com, dima@...ovin.in, daniel.kiper@...cle.com,
        nivedita@...m.mit.edu, rafael.j.wysocki@...el.com,
        dan.j.williams@...el.com, zhenzhong.duan@...cle.com,
        jroedel@...e.de, bhe@...hat.com, guro@...com,
        Thomas.Lendacky@....com, andriy.shevchenko@...ux.intel.com,
        keescook@...omium.org, hannes@...xchg.org, minchan@...nel.org,
        mhocko@...nel.org, ying.huang@...el.com,
        yang.shi@...ux.alibaba.com, gustavo@...eddedor.com,
        ziqian.lzq@...fin.com, vdavydov.dev@...il.com,
        jason.zeng@...el.com, kevin.tian@...el.com, zhiyuan.lv@...el.com,
        lei.l.li@...el.com, paul.c.lai@...el.com, ashok.raj@...el.com,
        linux-fsdevel@...r.kernel.org, linux-doc@...r.kernel.org,
        kexec@...ts.infradead.org
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.

Hi,
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 <anthony.yznaga@...cle.com>
> ---
>  include/linux/pkram.h |   2 +
>  mm/shmem_pkram.c      | 101 +++++++++++++++++++++++++++++++++++++++++++++++++-
>  2 files changed, 101 insertions(+), 2 deletions(-)

thanks.
-- 
~Randy

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