linux-kernel - Re: [RFC 34/43] shmem: PKRAM: multithread preserving and restoring shmem pages

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Date:   Thu, 7 May 2020 10:59:09 -0700
From:   Anthony Yznaga <anthony.yznaga@...cle.com>
To:     Randy Dunlap <rdunlap@...radead.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     willy@...radead.org, corbet@....net, tglx@...utronix.de,
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Subject: Re: [RFC 34/43] shmem: PKRAM: multithread preserving and restoring
 shmem pages



On 5/7/20 9:30 AM, Randy Dunlap wrote:
> 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.

I'll do that.  Thanks!

Anthony

>
>> 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.