All of lore.kernel.org
 help / color / mirror / Atom feed
From: Michal Hocko <mhocko@kernel.org>
To: Tianyu Lan <Tianyu.Lan@microsoft.com>
Cc: David Hildenbrand <david@redhat.com>,
	"lantianyu1986@gmail.com" <lantianyu1986@gmail.com>,
	KY Srinivasan <kys@microsoft.com>,
	Haiyang Zhang <haiyangz@microsoft.com>,
	Stephen Hemminger <sthemmin@microsoft.com>,
	"sashal@kernel.org" <sashal@kernel.org>,
	"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
	Michael Kelley <mikelley@microsoft.com>,
	"linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	vkuznets <vkuznets@redhat.com>,
	"eric.devolder@oracle.com" <eric.devolder@oracle.com>,
	"vbabka@suse.cz" <vbabka@suse.cz>,
	"osalvador@suse.de" <osalvador@suse.de>,
	Pasha Tatashin <Pavel.Tatashin@microsoft.com>,
	"rppt@linux.ibm.com" <rppt@linux.ibm.com>
Subject: Re: [EXTERNAL] Re: [RFC PATCH V2 2/10] mm: expose is_mem_section_removable() symbol
Date: Mon, 20 Jan 2020 15:14:33 +0100	[thread overview]
Message-ID: <20200120141433.GI18451@dhcp22.suse.cz> (raw)
In-Reply-To: <PS1P15301MB034764C1FFA3D2711DAED14C92360@PS1P15301MB0347.APCP153.PROD.OUTLOOK.COM>

On Fri 17-01-20 16:35:03, Tianyu Lan wrote:
[...]
> > Could you describe your usecase in more details please?
> 
> Hyper-V sends hot-remove request message which just contains requested
> page number but not provide detail range. So Hyper-V driver needs to search
> suitable memory block in system memory to return back to host if there is no
> memory hot-add before. So I used the is_mem_section_removable() do such check.

As David described, you would be much better of by using
alloc_contig_range to find a memory that would be suitable for
hotremoving without any races.
-- 
Michal Hocko
SUSE Labs

  reply	other threads:[~2020-01-20 14:14 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-07 13:09 [RFC PATCH V2 00/10] x86/Hyper-V: Add Dynamic memory hot-remove function lantianyu1986
2020-01-07 13:09 ` [RFC PATCH V2 1/10] mm/resource: Move child to new resource when release mem region lantianyu1986
2020-01-20 18:34   ` Michael Kelley
2020-01-20 19:20   ` Michael Kelley
2020-01-07 13:09 ` [RFC PATCH V2 2/10] mm: expose is_mem_section_removable() symbol lantianyu1986
2020-01-07 13:36   ` Michal Hocko
2020-01-10 13:41     ` David Hildenbrand
2020-01-13 14:49       ` [EXTERNAL] " Tianyu Lan
2020-01-13 15:01         ` David Hildenbrand
2020-01-14  9:50         ` Michal Hocko
2020-01-17 16:35           ` Tianyu Lan
2020-01-20 14:14             ` Michal Hocko [this message]
2020-01-07 13:09 ` [RFC PATCH V2 3/10] x86/Hyper-V/Balloon: Replace hot-add and balloon up works with a common work lantianyu1986
2020-01-20 19:12   ` Michael Kelley
2020-01-07 13:09 ` [RFC PATCH V2 4/10] x86/Hyper-V/Balloon: Convert spin lock ha_lock to mutex lantianyu1986
2020-01-07 13:09 ` [RFC PATCH V2 5/10] x86/Hyper-V/Balloon: Avoid releasing ha_lock when traverse ha_region_list lantianyu1986
2020-01-07 13:09 ` [RFC PATCH V2 6/10] x86/Hyper-V/Balloon: Enable mem hot-remove capability lantianyu1986
2020-01-07 13:09 ` [RFC PATCH V2 7/10] x86/Hyper-V/Balloon: Handle mem hot-remove request lantianyu1986
2020-01-08  9:54   ` kbuild test robot
2020-01-08 12:03   ` kbuild test robot
2020-01-07 13:09 ` [RFC PATCH V2 8/10] x86/Hyper-V/Balloon: Handle request with non-aligned page number lantianyu1986
2020-01-07 13:09 ` [RFC PATCH V2 9/10] x86/Hyper-V/Balloon: Hot add mem in the gaps of hot add region lantianyu1986
2020-01-07 13:09 ` [RFC PATCH V2 10/10] x86/Hyper-V: Workaround Hyper-V unballoon msg bug lantianyu1986
2020-01-08 22:23   ` kbuild test robot

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200120141433.GI18451@dhcp22.suse.cz \
    --to=mhocko@kernel.org \
    --cc=Pavel.Tatashin@microsoft.com \
    --cc=Tianyu.Lan@microsoft.com \
    --cc=akpm@linux-foundation.org \
    --cc=david@redhat.com \
    --cc=eric.devolder@oracle.com \
    --cc=haiyangz@microsoft.com \
    --cc=kys@microsoft.com \
    --cc=lantianyu1986@gmail.com \
    --cc=linux-hyperv@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --cc=mikelley@microsoft.com \
    --cc=osalvador@suse.de \
    --cc=rppt@linux.ibm.com \
    --cc=sashal@kernel.org \
    --cc=sthemmin@microsoft.com \
    --cc=vbabka@suse.cz \
    --cc=vkuznets@redhat.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.