From: Michal Hocko <mhocko@kernel.org>
To: Minchan Kim <minchan@kernel.org>
Cc: akpm@linux-foundation.org, ebru.akagunduz@gmail.com,
aarcange@redhat.com, aneesh.kumar@linux.vnet.ibm.com,
boaz@plexistor.com, gorcunov@openvz.org, hannes@cmpxchg.org,
hughd@google.com, iamjoonsoo.kim@lge.com,
kirill.shutemov@linux.intel.com, mgorman@suse.de,
n-horiguchi@ah.jp.nec.com, riel@redhat.com, rientjes@google.com,
vbabka@suse.cz, mm-commits@vger.kernel.org, linux-mm@kvack.org
Subject: Re: + mm-thp-avoid-unnecessary-swapin-in-khugepaged.patch added to -mm tree
Date: Fri, 20 May 2016 10:02:18 +0200 [thread overview]
Message-ID: <20160520080217.GG19172@dhcp22.suse.cz> (raw)
In-Reply-To: <20160520074450.GA14049@bbox>
On Fri 20-05-16 16:44:50, Minchan Kim wrote:
> > > > That being said khugepaged_max_ptes_none = HPAGE_PMD_NR/2 sounds like a
> > >
> > > max_ptes_none?
> >
> > Not sure I understand what you mean here.
>
> We are talking about max_ptes_swap and max_active_pages(i.e., pte_young)
> but suddenly you are saying max_ptes_none so I was curious it was just
> typo.
Because the default for pte_none resp. zero pages collapsing into THP is
khugepaged_max_ptes_none and the current default means that a single
present page is sufficient. That is way too optimistic. So I consider
this to be a good start. I am not so sure about minimum young pages
because that would probably require yet another tunable and we have more
than enough of them. Anyway I guess we are getting off-topic here...
--
Michal Hocko
SUSE Labs
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next prev parent reply other threads:[~2016-05-20 8:02 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <57212c60.fUSE244UFwhXE+az%akpm@linux-foundation.org>
2016-04-28 15:19 ` Michal Hocko
2016-05-17 7:58 ` Michal Hocko
2016-05-17 9:02 ` Michal Hocko
2016-05-17 11:31 ` Kirill A. Shutemov
2016-05-17 12:25 ` Michal Hocko
2016-05-19 5:00 ` Minchan Kim
2016-05-19 7:03 ` Michal Hocko
2016-05-19 7:27 ` Minchan Kim
2016-05-19 7:39 ` Michal Hocko
2016-05-20 0:21 ` Minchan Kim
2016-05-20 6:39 ` Michal Hocko
2016-05-20 7:26 ` Minchan Kim
2016-05-20 7:34 ` Michal Hocko
2016-05-20 7:44 ` Minchan Kim
2016-05-20 8:02 ` Michal Hocko [this message]
2016-05-20 8:26 ` Minchan Kim
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