Re: [RFC v5 0/3] mm: make swapin readahead to gain more thp performance

From	Ebru Akagunduz <ebru.akagunduz@gmail.com>
Newsgroups	linux.kernel
Subject	Re: [RFC v5 0/3] mm: make swapin readahead to gain more thp performance
Date	2016-03-03 23:10 +0100
Message-ID	<r8JBw-5ff-15@gated-at.bofh.it> (permalink)
References	(2 earlier) <r5YGK-qv-9@gated-at.bofh.it> <r6cJI-27E-21@gated-at.bofh.it> <r6dFN-2OI-31@gated-at.bofh.it> <r6jUS-7t5-13@gated-at.bofh.it> <r6s26-4LU-15@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Fri, Feb 26, 2016 at 09:51:56AM -0500, Rik van Riel wrote:
> On Thu, 2016-02-25 at 22:17 -0800, Hugh Dickins wrote:
> > On Fri, 26 Feb 2016, Ebru Akagunduz wrote:
> > > in Thu, Feb 25, 2016 at 05:35:50PM -0500, Rik van Riel wrote:
> > 
> > > > Am I forgetting anything obvious?
> > > > 
> > > > Is this too aggressive?
> > > > 
> > > > Not aggressive enough?
> > > > 
> > > > Could PGPGOUT + PGSWPOUT be a useful
> > > > in-between between just PGSWPOUT or
> > > > PGSTEAL_*?
> > 
> > I've no idea offhand, would have to study what each of those
> > actually means: I'm really not familiar with them myself.
> 
> There are a few levels of page reclaim activity:
> 
> PGSTEAL_* - any page was reclaimed, this could just
>             be file pages for streaming file IO,etc
> 
> PGPGOUT   - the VM wrote pages back to disk to reclaim
>             them, this could include file pages
> 
> PGSWPOUT  - the VM wrote something to swap to reclaim
>             memory
> 
> I am not sure which level of aggressiveness khugepaged
> should check against, but my gut instinct would probably
> be the second or third.

I tested with PGPGOUT, it does not help as I expect.
As Rik's suggestion, PSWPOUT and ALLOCSTALL can be good.

I started to prepare the patch last week. Just wanted to
make you sure.

Kind regards.

Thread

Re: [RFC v5 0/3] mm: make swapin readahead to gain more thp  performance Hugh Dickins <hughd@google.com> - 2016-02-25 08:40 +0100
  Re: [RFC v5 0/3] mm: make swapin readahead to gain more thp  performance Rik van Riel <riel@redhat.com> - 2016-02-25 23:40 +0100
    Re: [RFC v5 0/3] mm: make swapin readahead to gain more thp  performance Ebru Akagunduz <ebru.akagunduz@gmail.com> - 2016-02-26 00:40 +0100
      Re: [RFC v5 0/3] mm: make swapin readahead to gain more thp  performance Hugh Dickins <hughd@google.com> - 2016-02-26 07:20 +0100
        Re: [RFC v5 0/3] mm: make swapin readahead to gain more thp  performance Rik van Riel <riel@redhat.com> - 2016-02-26 16:00 +0100
          Re: [RFC v5 0/3] mm: make swapin readahead to gain more thp  performance Ebru Akagunduz <ebru.akagunduz@gmail.com> - 2016-03-03 23:10 +0100
  Re: [RFC v5 0/3] mm: make swapin readahead to gain more thp  performance Ebru Akagunduz <ebru.akagunduz@gmail.com> - 2016-02-26 00:20 +0100

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