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From: David Hildenbrand <david@redhat.com>
To: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	Andrew Morton <akpm@linux-foundation.org>,
	Arnd Bergmann <arnd@arndb.de>, Michal Hocko <mhocko@suse.com>,
	Oscar Salvador <osalvador@suse.de>,
	Matthew Wilcox <willy@infradead.org>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Minchan Kim <minchan@kernel.org>, Jann Horn <jannh@google.com>,
	Jason Gunthorpe <jgg@ziepe.ca>,
	Dave Hansen <dave.hansen@intel.com>,
	Hugh Dickins <hughd@google.com>, Rik van Riel <riel@surriel.com>,
	"Michael S . Tsirkin" <mst@redhat.com>,
	"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
	Vlastimil Babka <vbabka@suse.cz>,
	Richard Henderson <rth@twiddle.net>,
	Ivan Kokshaysky <ink@jurassic.park.msu.ru>,
	Matt Turner <mattst88@gmail.com>,
	Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	"James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>,
	Helge Deller <deller@gmx.de>, Chris Zankel <chris@zankel.net>,
	Max Filippov <jcmvbkbc@gmail.com>,
	Mike Kravetz <mike.kravetz@oracle.com>,
	Peter Xu <peterx@redhat.com>,
	Rolf Eike Beer <eike-kernel@sf-tec.de>,
	linux-alpha@vger.kernel.org, linux-mips@vger.kernel.org,
	linux-parisc@vger.kernel.org, linux-xtensa@linux-xtensa.org,
	linux-arch@vger.kernel.org, Linux API <linux-api@vger.kernel.org>
Subject: Re: [PATCH RFCv2] mm/madvise: introduce MADV_POPULATE_(READ|WRITE) to prefault/prealloc memory
Date: Mon, 15 Mar 2021 13:25:40 +0100	[thread overview]
Message-ID: <7d607d1c-efd5-3888-39bb-9e5f8bc08185@redhat.com> (raw)
In-Reply-To: <20210315122213.k52wtlbbhsw42pks@box>

On 15.03.21 13:22, Kirill A. Shutemov wrote:
> On Mon, Mar 08, 2021 at 05:45:20PM +0100, David Hildenbrand wrote:
>> +			case -EHWPOISON: /* Skip over any poisoned pages. */
>> +				start += PAGE_SIZE;
>> +				continue;
> 
> Why is it good approach? It's not abvious to me.

My main motivation was to simplify return code handling. I don't want to 
return -EHWPOISON to user space and I don't want to convert it into 
something misleading like -ENOMEM or -EINVAL. So I decided to handle 
such stuff internally.

What would be you take on that?

-- 
Thanks,

David / dhildenb


WARNING: multiple messages have this Message-ID (diff)
From: David Hildenbrand <david@redhat.com>
To: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	Andrew Morton <akpm@linux-foundation.org>,
	Arnd Bergmann <arnd@arndb.de>, Michal Hocko <mhocko@suse.com>,
	Oscar Salvador <osalvador@suse.de>,
	Matthew Wilcox <willy@infradead.org>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Minchan Kim <minchan@kernel.org>, Jann Horn <jannh@google.com>,
	Jason Gunthorpe <jgg@ziepe.ca>,
	Dave Hansen <dave.hansen@intel.com>,
	Hugh Dickins <hughd@google.com>, Rik van Riel <riel@surriel.com>,
	"Michael S . Tsirkin" <mst@redhat.com>,
	"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
	Vlastimil Babka <vbabka@suse.cz>,
	Richard Henderson <rth@twiddle.net>,
	Ivan Kokshaysky <ink@jurassic.park.msu.ru>,
	Matt Turner <mattst88@gmail.com>,
	Thomas Bogendoerfer <tsbogend@alpha.franken.d>
Subject: Re: [PATCH RFCv2] mm/madvise: introduce MADV_POPULATE_(READ|WRITE) to prefault/prealloc memory
Date: Mon, 15 Mar 2021 13:25:40 +0100	[thread overview]
Message-ID: <7d607d1c-efd5-3888-39bb-9e5f8bc08185@redhat.com> (raw)
In-Reply-To: <20210315122213.k52wtlbbhsw42pks@box>

On 15.03.21 13:22, Kirill A. Shutemov wrote:
> On Mon, Mar 08, 2021 at 05:45:20PM +0100, David Hildenbrand wrote:
>> +			case -EHWPOISON: /* Skip over any poisoned pages. */
>> +				start += PAGE_SIZE;
>> +				continue;
> 
> Why is it good approach? It's not abvious to me.

My main motivation was to simplify return code handling. I don't want to 
return -EHWPOISON to user space and I don't want to convert it into 
something misleading like -ENOMEM or -EINVAL. So I decided to handle 
such stuff internally.

What would be you take on that?

-- 
Thanks,

David / dhildenb


  reply	other threads:[~2021-03-15 12:26 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-08 16:45 [PATCH RFCv2] mm/madvise: introduce MADV_POPULATE_(READ|WRITE) to prefault/prealloc memory David Hildenbrand
2021-03-08 16:45 ` David Hildenbrand
2021-03-09  7:35 ` Rolf Eike Beer
2021-03-09  7:35   ` Rolf Eike Beer
2021-03-09  8:31   ` David Hildenbrand
2021-03-09  8:31     ` David Hildenbrand
2021-03-10 16:07 ` David Hildenbrand
2021-03-10 16:07   ` David Hildenbrand
2021-03-15 12:22 ` Kirill A. Shutemov
2021-03-15 12:22   ` Kirill A. Shutemov
2021-03-15 12:25   ` David Hildenbrand [this message]
2021-03-15 12:25     ` David Hildenbrand
2021-03-15 13:03     ` Kirill A. Shutemov
2021-03-15 13:03       ` Kirill A. Shutemov
2021-03-15 13:26       ` David Hildenbrand
2021-03-15 13:26         ` David Hildenbrand
2021-03-15 16:28         ` David Hildenbrand
2021-03-15 16:28           ` David Hildenbrand

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