Re: [PATCH 0/7] mm: Improve swap path scalability with batched operations

From	Andi Kleen <andi@firstfloor.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH 0/7] mm: Improve swap path scalability with batched operations
Date	2016-05-04 23:10 +0200
Message-ID	<rvcdr-30d-1@gated-at.bofh.it> (permalink)
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> In order this to work other quite intrusive changes to the current
> reclaim decisions would have to be made though. This is what I tried to
> say. Look at get_scan_count() on how we are making many steps to ignore
> swappiness or prefer the page cache. Even when we make swapout scale it
> won't help much if we do not swap out that often. That's why I claim

But if you made swapout to scale you would need some equivalent
of Tim's patches for the swap path... So you need them in case.

> that we really should think more long term and maybe reconsider these
> decisions which were based on the rotating rust for the swap devices.

Sure that makes sense, but why not start with low hanging fruit
in basic performance, like Tim did? Usually that is how Linux
changes work, steady evolution, not revolution.

-Andi

-- 
ak@linux.intel.com -- Speaking for myself only.

Thread

[PATCH 0/7] mm: Improve swap path scalability with batched  operations Tim Chen <tim.c.chen@linux.intel.com> - 2016-05-03 23:10 +0200
  Re: [PATCH 0/7] mm: Improve swap path scalability with batched  operations Michal Hocko <mhocko@kernel.org> - 2016-05-04 14:50 +0200
    Re: [PATCH 0/7] mm: Improve swap path scalability with batched  operations Tim Chen <tim.c.chen@linux.intel.com> - 2016-05-04 19:20 +0200
      Re: [PATCH 0/7] mm: Improve swap path scalability with batched  operations Michal Hocko <mhocko@kernel.org> - 2016-05-04 21:50 +0200
        Re: [PATCH 0/7] mm: Improve swap path scalability with batched  operations Andi Kleen <andi@firstfloor.org> - 2016-05-04 23:10 +0200
        Re: [PATCH 0/7] mm: Improve swap path scalability with batched  operations Johannes Weiner <hannes@cmpxchg.org> - 2016-05-04 23:30 +0200
          Re: [PATCH 0/7] mm: Improve swap path scalability with batched  operations Minchan Kim <minchan@kernel.org> - 2016-05-05 02:10 +0200
          Re: [PATCH 0/7] mm: Improve swap path scalability with batched  operations Michal Hocko <mhocko@kernel.org> - 2016-05-05 09:50 +0200
            Re: [PATCH 0/7] mm: Improve swap path scalability with batched  operations Tim Chen <tim.c.chen@linux.intel.com> - 2016-05-05 18:00 +0200

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