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From: "Jan Beulich" <JBeulich@suse.com>
To: George Dunlap <george.dunlap@citrix.com>,
	Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: tim@xen.org, sstabellini@kernel.org, wei.liu2@citrix.com,
	George.Dunlap@eu.citrix.com,
	Andrew Cooper <andrew.cooper3@citrix.com>,
	ian.jackson@eu.citrix.com, xen-devel@lists.xen.org
Subject: Re: [PATCH RESEND RFC 0/8] Memory scrubbing from idle loop
Date: Wed, 01 Mar 2017 09:27:44 -0700	[thread overview]
Message-ID: <58B70490020000780013EE2F@prv-mh.provo.novell.com> (raw)
In-Reply-To: <68e18c6b-9d82-03c6-5253-652580ed6e6b@oracle.com>

>>> On 01.03.17 at 17:14, <boris.ostrovsky@oracle.com> wrote:
> On 03/01/2017 10:48 AM, George Dunlap wrote:
>> On 27/02/17 17:06, Boris Ostrovsky wrote:
>>> Since dirty pages are always at the tail of page lists we are not really
>>> searching the lists. As soon as a clean page is found (starting from the
>>> tail) we can stop.
>> Sure, having a back and a front won't add significant overhead; but it
>> does make things a bit strange.  What does it buy us over having two lists?
> 
> If we implement dirty heap just like we do regular heap (i.e.
> node/zone/order) that datastructure is almost a megabyte under current
> assumptions (i.e. sizeof(page_list_head) * MAX_NUMNODES * NR_ZONES *
> (MAX_ORDER+1) = 16 * 41 * 21 * 64 = 881664).

Furthermore I'd be afraid for this to move us further away from
being able to recombine higher order buddies early.

Jan


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  reply	other threads:[~2017-03-01 16:27 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-02-27  0:37 [PATCH RESEND RFC 0/8] Memory scrubbing from idle loop Boris Ostrovsky
2017-02-27  0:37 ` [PATCH RESEND RFC 1/8] mm: Separate free page chunk merging into its own routine Boris Ostrovsky
2017-02-27 15:17   ` Andrew Cooper
2017-02-27 16:29   ` Dario Faggioli
2017-02-27 17:07     ` Boris Ostrovsky
2017-02-27  0:37 ` [PATCH RESEND RFC 2/8] mm: Place unscrubbed pages at the end of pagelist Boris Ostrovsky
2017-02-27 15:38   ` Andrew Cooper
2017-02-27 15:52     ` Boris Ostrovsky
2017-02-27  0:37 ` [PATCH RESEND RFC 3/8] mm: Scrub pages in alloc_heap_pages() if needed Boris Ostrovsky
2017-02-27  0:37 ` [PATCH RESEND RFC 4/8] mm: Scrub memory from idle loop Boris Ostrovsky
2017-02-27  0:37 ` [PATCH RESEND RFC 5/8] mm: Do not discard already-scrubbed pages softirqs are pending Boris Ostrovsky
2017-02-27  0:37 ` [PATCH RESEND RFC 6/8] spinlock: Introduce _spin_lock_cond() Boris Ostrovsky
2017-02-27  0:37 ` [PATCH RESEND RFC 7/8] mm: Keep pages available for allocation while scrubbing Boris Ostrovsky
2017-02-27  0:37 ` [PATCH RESEND RFC 8/8] mm: Print number of unscrubbed pages in 'H' debug handler Boris Ostrovsky
2017-02-27 16:18 ` [PATCH RESEND RFC 0/8] Memory scrubbing from idle loop Andrew Cooper
2017-02-27 17:06   ` Boris Ostrovsky
2017-02-27 18:09     ` Andrew Cooper
2017-03-01 15:48     ` George Dunlap
2017-03-01 16:14       ` Boris Ostrovsky
2017-03-01 16:27         ` Jan Beulich [this message]
2017-03-01 16:43           ` Boris Ostrovsky

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