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
next prev parent reply other threads:[~2020-01-20 14:14 UTC|newest]
Thread overview: 21+ 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
2020-01-07 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
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