From: Tianyu Lan <Tianyu.Lan@microsoft.com>
To: Michal Hocko <mhocko@kernel.org>
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: Fri, 17 Jan 2020 16:35:03 +0000 [thread overview]
Message-ID: <PS1P15301MB034764C1FFA3D2711DAED14C92360@PS1P15301MB0347.APCP153.PROD.OUTLOOK.COM> (raw)
In-Reply-To: <20200114095057.GK19428@dhcp22.suse.cz>
> From: Michal Hocko <mhocko@kernel.org>
> Sent: Tuesday, January 14, 2020 5:51 PM
> To: Tianyu Lan <Tianyu.Lan@microsoft.com>
> Cc: David Hildenbrand <david@redhat.com>; lantianyu1986@gmail.com; KY
> Srinivasan <kys@microsoft.com>; Haiyang Zhang <haiyangz@microsoft.com>;
> Stephen Hemminger <sthemmin@microsoft.com>; sashal@kernel.org;
> akpm@linux-foundation.org; Michael Kelley <mikelley@microsoft.com>; linux-
> hyperv@vger.kernel.org; linux-kernel@vger.kernel.org; linux-mm@kvack.org;
> vkuznets <vkuznets@redhat.com>; eric.devolder@oracle.com; vbabka@suse.cz;
> osalvador@suse.de; Pasha Tatashin <Pavel.Tatashin@microsoft.com>;
> rppt@linux.ibm.com
> Subject: Re: [EXTERNAL] Re: [RFC PATCH V2 2/10] mm: expose
> is_mem_section_removable() symbol
>
> On Mon 13-01-20 14:49:38, Tianyu Lan wrote:
> > Hi David & Michal:
> > Thanks for your review. Some memory blocks are not suitable for hot-
> plug.
> > If not check memory block's removable, offline_pages() will report
> > some failure error e.g, "failed due to memory holes" and "failure to
> > isolate range". I think the check maybe added into
> > offline_and_remove_memory()? This may help to not create/expose a new
> interface to do such check in module.
>
> Why is a log message a problem in the first place. The operation has failed
> afterall. Does the driver try to offline an arbitrary memory?
Yes.
> 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.
next prev parent reply other threads:[~2020-01-17 16:35 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 [this message]
2020-01-20 14:14 ` Michal Hocko
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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