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From: Michal Hocko <mhocko@kernel.org>
To: David Hildenbrand <david@redhat.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>,
	linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
	Vlastimil Babka <vbabka@suse.cz>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Mike Rapoport <rppt@linux.vnet.ibm.com>,
	Mike Kravetz <mike.kravetz@oracle.com>,
	Jason Gunthorpe <jgg@ziepe.ca>,
	Dan Williams <dan.j.williams@intel.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Mark Brown <broonie@kernel.org>,
	Steven Price <Steven.Price@arm.com>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Masahiro Yamada <yamada.masahiro@socionext.com>,
	Kees Cook <keescook@chromium.org>,
	Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
	Matthew Wilcox <willy@infradead.org>,
	Sri Krishna chowdary <schowdary@nvidia.com>,
	Dave Hansen <dave.hansen@intel.com>,
	Russell King - ARM Linux <linux@armlinux.org.uk>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Paul Mackerras <paulus@samba.org>,
	Martin Schwidefsky <schwidefsky@de.ibm.com>,
	Heiko Carstens <heiko.carstens@de.ibm.com>,
	"David S. Miller" <davem@davemloft.net>,
	Vineet Gupta <vgupta@synopsys.com>,
	James Hogan <jhogan@kernel.org>,
	Paul Burton <paul.burton@mips.com>,
	Ralf Baechle <ralf@linux-mips.org>,
	"Kirill A . Shutemov" <kirill@shutemov.name>,
	Gerald Schaefer <gerald.schaefer@de.ibm.com>,
	Christophe Leroy <christophe.leroy@c-s.fr>,
	David Rientjes <rientjes@google.com>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Oscar Salvador <osalvador@suse.de>,
	Mel Gorman <mgorman@techsingularity.net>,
	linux-snps-arc@lists.infradead.org, linux-mips@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org,
	linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org,
	linux-sh@vger.kernel.org, sparclinux@vger.kernel.org,
	x86@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH V6 1/2] mm/page_alloc: Make alloc_gigantic_page() available for general use
Date: Tue, 15 Oct 2019 14:09:56 +0200	[thread overview]
Message-ID: <20191015120956.GF317@dhcp22.suse.cz> (raw)
In-Reply-To: <513bc2f7-8110-58f7-36c1-a04b59f11f7e@redhat.com>

On Tue 15-10-19 13:50:02, David Hildenbrand wrote:
> On 15.10.19 13:47, Michal Hocko wrote:
> > On Tue 15-10-19 13:42:03, David Hildenbrand wrote:
> > [...]
> > > > -static bool pfn_range_valid_gigantic(struct zone *z,
> > > > -			unsigned long start_pfn, unsigned long nr_pages)
> > > > -{
> > > > -	unsigned long i, end_pfn = start_pfn + nr_pages;
> > > > -	struct page *page;
> > > > -
> > > > -	for (i = start_pfn; i < end_pfn; i++) {
> > > > -		if (!pfn_valid(i))
> > > > -			return false;
> > > > -
> > > > -		page = pfn_to_page(i);
> > > 
> > > Am I missing something or should here really be a pfn_to_online_page() here
> > > instead of a pfn_valid() ?
> > 
> > http://lkml.kernel.org/r/20180423000943.GO17484@dhcp22.suse.cz
> > 
> 
> So we managed to add PageReserved(page) but not pfn_to_online_page(). But it
> is the right thing to do? (or am I missing something?)

Yeah, pfn_to_online_page is better. But please note that this is an
optimistic check. The real check has to be done when isolating the
pageblock because things might change in the meantime.
-- 
Michal Hocko
SUSE Labs


WARNING: multiple messages have this Message-ID (diff)
From: Michal Hocko <mhocko@kernel.org>
To: David Hildenbrand <david@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
	linux-ia64@vger.kernel.org, linux-sh@vger.kernel.org,
	Peter Zijlstra <peterz@infradead.org>,
	James Hogan <jhogan@kernel.org>,
	Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
	Heiko Carstens <heiko.carstens@de.ibm.com>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	Paul Mackerras <paulus@samba.org>,
	sparclinux@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>,
	Andrea Arcangeli <aarcange@redhat.com>,
	linux-s390@vger.kernel.org, x86@kernel.org,
	Russell King - ARM Linux <linux@armlinux.org.uk>,
	Matthew Wilcox <willy@infradead.org>,
	Steven Price <Steven.Price@arm.com>,
	Jason Gunthorpe <jgg@ziepe.ca>,
	Gerald Schaefer <gerald.schaefer@de.ibm.com>,
	David Rientjes <rientjes@google.com>,
	linux-snps-arc@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org,
	Kees Cook <keescook@chromium.org>,
	Anshuman Khandual <anshuman.khandual@arm.com>,
	Masahiro Yamada <yamada.masahiro@socionext.com>,
	linuxppc-dev@lists.ozlabs.org, Mark Brown <broonie@kernel.org>,
	"Kirill A . Shutemov" <kirill@shutemov.name>,
	Dan Williams <dan.j.williams@intel.com>,
	Vlastimil Babka <vbabka@suse.cz>,
	Oscar Salvador <osalvador@suse.de>,
	Sri Krishna chowdary <schowdary@nvidia.com>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Dave Hansen <dave.hansen@intel.com>,
	linux-mips@vger.kernel.org, Ralf Baechle <ralf@linux-mips.org>,
	Paul Burton <paul.burton@mips.com>,
	Mike Rapoport <rppt@linux.vnet.ibm.com>,
	Vineet Gupta <vgupta@synopsys.com>,
	Martin Schwidefsky <schwidefsky@de.ibm.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Mel Gorman <mgorman@techsingularity.net>,
	"David S. Miller" <davem@davemloft.net>,
	Mike Kravetz <mike.kravetz@oracle.com>
Subject: Re: [PATCH V6 1/2] mm/page_alloc: Make alloc_gigantic_page() available for general use
Date: Tue, 15 Oct 2019 14:09:56 +0200	[thread overview]
Message-ID: <20191015120956.GF317@dhcp22.suse.cz> (raw)
In-Reply-To: <513bc2f7-8110-58f7-36c1-a04b59f11f7e@redhat.com>

On Tue 15-10-19 13:50:02, David Hildenbrand wrote:
> On 15.10.19 13:47, Michal Hocko wrote:
> > On Tue 15-10-19 13:42:03, David Hildenbrand wrote:
> > [...]
> > > > -static bool pfn_range_valid_gigantic(struct zone *z,
> > > > -			unsigned long start_pfn, unsigned long nr_pages)
> > > > -{
> > > > -	unsigned long i, end_pfn = start_pfn + nr_pages;
> > > > -	struct page *page;
> > > > -
> > > > -	for (i = start_pfn; i < end_pfn; i++) {
> > > > -		if (!pfn_valid(i))
> > > > -			return false;
> > > > -
> > > > -		page = pfn_to_page(i);
> > > 
> > > Am I missing something or should here really be a pfn_to_online_page() here
> > > instead of a pfn_valid() ?
> > 
> > http://lkml.kernel.org/r/20180423000943.GO17484@dhcp22.suse.cz
> > 
> 
> So we managed to add PageReserved(page) but not pfn_to_online_page(). But it
> is the right thing to do? (or am I missing something?)

Yeah, pfn_to_online_page is better. But please note that this is an
optimistic check. The real check has to be done when isolating the
pageblock because things might change in the meantime.
-- 
Michal Hocko
SUSE Labs

WARNING: multiple messages have this Message-ID (diff)
From: Michal Hocko <mhocko@kernel.org>
To: David Hildenbrand <david@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
	linux-ia64@vger.kernel.org, linux-sh@vger.kernel.org,
	Peter Zijlstra <peterz@infradead.org>,
	James Hogan <jhogan@kernel.org>,
	Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
	Heiko Carstens <heiko.carstens@de.ibm.com>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	Paul Mackerras <paulus@samba.org>,
	sparclinux@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>,
	Andrea Arcangeli <aarcange@redhat.com>,
	linux-s390@vger.kernel.org, Michael Ellerman <mpe@ellerman.id.au>,
	x86@kernel.org, Russell King - ARM Linux <linux@armlinux.org.uk>,
	Matthew Wilcox <willy@infradead.org>,
	Steven Price <Steven.Price@arm.com>,
	Jason Gunthorpe <jgg@ziepe.ca>,
	Gerald Schaefer <gerald.schaefer@de.ibm.com>,
	David Rientjes <rientjes@google.com>,
	linux-snps-arc@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org,
	Kees Cook <keescook@chromium.org>,
	Anshuman Khandual <anshuman.khandual@arm.com>,
	Masahiro Yamada <yamada.masahiro@socionext.com>,
	linuxppc-dev@lists.ozlabs.org, Mark Brown <broonie@kernel.org>,
	"Kirill A . Shutemov" <kirill@shutemov.name>,
	Dan Williams <dan.j.williams@intel.com>,
	Vlastimil Babka <vbabka@suse.cz>,
	Oscar Salvador <osalvador@suse.de>,
	Christophe Leroy <christophe.leroy@c-s.fr>,
	Sri Krishna chowdary <schowdary@nvidia.com>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Dave Hansen <dave.hansen@intel.com>,
	linux-mips@vger.kernel.org, Ralf Baechle <ralf@linux-mips.org>,
	Paul Burton <paul.burton@mips.com>,
	Mike Rapoport <rppt@linux.vnet.ibm.com>,
	Vineet Gupta <vgupta@synopsys.com>,
	Martin Schwidefsky <schwidefsky@de.ibm.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Mel Gorman <mgorman@techsingularity.net>,
	"David S. Miller" <davem@davemloft.net>,
	Mike Kravetz <mike.kravetz@oracle.com>
Subject: Re: [PATCH V6 1/2] mm/page_alloc: Make alloc_gigantic_page() available for general use
Date: Tue, 15 Oct 2019 14:09:56 +0200	[thread overview]
Message-ID: <20191015120956.GF317@dhcp22.suse.cz> (raw)
In-Reply-To: <513bc2f7-8110-58f7-36c1-a04b59f11f7e@redhat.com>

On Tue 15-10-19 13:50:02, David Hildenbrand wrote:
> On 15.10.19 13:47, Michal Hocko wrote:
> > On Tue 15-10-19 13:42:03, David Hildenbrand wrote:
> > [...]
> > > > -static bool pfn_range_valid_gigantic(struct zone *z,
> > > > -			unsigned long start_pfn, unsigned long nr_pages)
> > > > -{
> > > > -	unsigned long i, end_pfn = start_pfn + nr_pages;
> > > > -	struct page *page;
> > > > -
> > > > -	for (i = start_pfn; i < end_pfn; i++) {
> > > > -		if (!pfn_valid(i))
> > > > -			return false;
> > > > -
> > > > -		page = pfn_to_page(i);
> > > 
> > > Am I missing something or should here really be a pfn_to_online_page() here
> > > instead of a pfn_valid() ?
> > 
> > http://lkml.kernel.org/r/20180423000943.GO17484@dhcp22.suse.cz
> > 
> 
> So we managed to add PageReserved(page) but not pfn_to_online_page(). But it
> is the right thing to do? (or am I missing something?)

Yeah, pfn_to_online_page is better. But please note that this is an
optimistic check. The real check has to be done when isolating the
pageblock because things might change in the meantime.
-- 
Michal Hocko
SUSE Labs

_______________________________________________
linux-snps-arc mailing list
linux-snps-arc@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-snps-arc

WARNING: multiple messages have this Message-ID (diff)
From: Michal Hocko <mhocko@kernel.org>
To: David Hildenbrand <david@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
	linux-ia64@vger.kernel.org, linux-sh@vger.kernel.org,
	Peter Zijlstra <peterz@infradead.org>,
	James Hogan <jhogan@kernel.org>,
	Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
	Heiko Carstens <heiko.carstens@de.ibm.com>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	Paul Mackerras <paulus@samba.org>,
	sparclinux@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>,
	Andrea Arcangeli <aarcange@redhat.com>,
	linux-s390@vger.kernel.org, Michael Ellerman <mpe@ellerman.id.au>,
	x86@kernel.org, Russell King - ARM Linux <linux@armlinux.org.uk>,
	Matthew Wilcox <willy@infradead.org>,
	Steven Price <Steven.Price@arm.com>,
	Jason Gunthorpe <jgg@ziepe.ca>,
	Gerald Schaefer <gerald.schaefer@de.ibm.com>,
	David Rientjes <rientjes@google.com>,
	linux-snps-arc@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org,
	Kees Cook <keescook@chromium.org>,
	Anshuman Khandual <anshuman.khandual@arm.com>,
	Masahiro Yamada <yamada.masahiro@socionext.com>,
	linuxppc-dev@lists.ozlabs.org, Mark Brown <broonie@kernel.org>,
	"Kirill A . Shutemov" <kirill@shutemov.name>,
	Dan Williams <dan.j.williams@intel.com>,
	Vlastimil Babka <vbabka@suse.cz>,
	Oscar Salvador <osalvador@suse.de>,
	Christophe Leroy <christophe.leroy@c-s.fr>,
	Sri Krishna chowdary <schowdary@nvidia.com>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Dave Hansen <dave.hansen@intel.com>,
	linux-mips@vger.kernel.org, Ralf Baechle <ralf@linux-mips.org>,
	Paul Burton <paul.burton@mips.com>,
	Mike Rapoport <rppt@linux.vnet.ibm.com>,
	Vineet Gupta <vgupta@synopsys.com>,
	Martin Schwidefsky <schwidefsky@de.ibm.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Mel Gorman <mgorman@techsingularity.net>,
	"David S. Miller" <davem@davemloft.net>,
	Mike Kravetz <mike.kravetz@oracle.com>
Subject: Re: [PATCH V6 1/2] mm/page_alloc: Make alloc_gigantic_page() available for general use
Date: Tue, 15 Oct 2019 14:09:56 +0200	[thread overview]
Message-ID: <20191015120956.GF317@dhcp22.suse.cz> (raw)
In-Reply-To: <513bc2f7-8110-58f7-36c1-a04b59f11f7e@redhat.com>

On Tue 15-10-19 13:50:02, David Hildenbrand wrote:
> On 15.10.19 13:47, Michal Hocko wrote:
> > On Tue 15-10-19 13:42:03, David Hildenbrand wrote:
> > [...]
> > > > -static bool pfn_range_valid_gigantic(struct zone *z,
> > > > -			unsigned long start_pfn, unsigned long nr_pages)
> > > > -{
> > > > -	unsigned long i, end_pfn = start_pfn + nr_pages;
> > > > -	struct page *page;
> > > > -
> > > > -	for (i = start_pfn; i < end_pfn; i++) {
> > > > -		if (!pfn_valid(i))
> > > > -			return false;
> > > > -
> > > > -		page = pfn_to_page(i);
> > > 
> > > Am I missing something or should here really be a pfn_to_online_page() here
> > > instead of a pfn_valid() ?
> > 
> > http://lkml.kernel.org/r/20180423000943.GO17484@dhcp22.suse.cz
> > 
> 
> So we managed to add PageReserved(page) but not pfn_to_online_page(). But it
> is the right thing to do? (or am I missing something?)

Yeah, pfn_to_online_page is better. But please note that this is an
optimistic check. The real check has to be done when isolating the
pageblock because things might change in the meantime.
-- 
Michal Hocko
SUSE Labs

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  parent reply	other threads:[~2019-10-15 12:10 UTC|newest]

Thread overview: 92+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-15  9:21 [PATCH V6 0/2] mm/debug: Add tests validating architecture page table helpers Anshuman Khandual
2019-10-15  9:33 ` Anshuman Khandual
2019-10-15  9:21 ` Anshuman Khandual
2019-10-15  9:21 ` Anshuman Khandual
2019-10-15  9:21 ` [PATCH V6 1/2] mm/page_alloc: Make alloc_gigantic_page() available for general use Anshuman Khandual
2019-10-15  9:21   ` Anshuman Khandual
2019-10-15  9:21   ` Anshuman Khandual
2019-10-15 10:45   ` Michal Hocko
2019-10-15 10:45     ` Michal Hocko
2019-10-15 10:45     ` Michal Hocko
2019-10-15 10:45     ` Michal Hocko
2019-10-15 11:07     ` Anshuman Khandual
2019-10-15 11:07       ` Anshuman Khandual
2019-10-15 11:07       ` Anshuman Khandual
2019-10-15 11:07       ` Anshuman Khandual
2019-10-15 11:42   ` David Hildenbrand
2019-10-15 11:42     ` David Hildenbrand
2019-10-15 11:42     ` David Hildenbrand
2019-10-15 11:42     ` David Hildenbrand
2019-10-15 11:47     ` Michal Hocko
2019-10-15 11:47       ` Michal Hocko
2019-10-15 11:47       ` Michal Hocko
2019-10-15 11:47       ` Michal Hocko
2019-10-15 11:50       ` David Hildenbrand
2019-10-15 11:50         ` David Hildenbrand
2019-10-15 11:50         ` David Hildenbrand
2019-10-15 11:50         ` David Hildenbrand
2019-10-15 12:01         ` David Hildenbrand
2019-10-15 12:01           ` David Hildenbrand
2019-10-15 12:01           ` David Hildenbrand
2019-10-15 12:01           ` David Hildenbrand
2019-10-15 12:09         ` Michal Hocko [this message]
2019-10-15 12:09           ` Michal Hocko
2019-10-15 12:09           ` Michal Hocko
2019-10-15 12:09           ` Michal Hocko
2019-10-15 12:11           ` Michal Hocko
2019-10-15 12:11             ` Michal Hocko
2019-10-15 12:11             ` Michal Hocko
2019-10-15 12:11             ` Michal Hocko
2019-10-15  9:21 ` [PATCH V6 2/2] mm/debug: Add tests validating architecture page table helpers Anshuman Khandual
2019-10-15  9:33   ` Anshuman Khandual
2019-10-15  9:21   ` Anshuman Khandual
2019-10-15  9:21   ` Anshuman Khandual
2019-10-15 11:46   ` Michal Hocko
2019-10-15 11:46     ` Michal Hocko
2019-10-15 11:46     ` Michal Hocko
2019-10-15 11:46     ` Michal Hocko
2019-10-15 11:46     ` Michal Hocko
2019-10-15 12:27     ` Anshuman Khandual
2019-10-15 12:39       ` Anshuman Khandual
2019-10-15 12:27       ` Anshuman Khandual
2019-10-15 12:27       ` Anshuman Khandual
2019-10-15 12:27       ` Anshuman Khandual
2019-10-15 18:09   ` Qian Cai
2019-10-15 18:09     ` Qian Cai
2019-10-15 18:09     ` Qian Cai
2019-10-15 18:09     ` Qian Cai
2019-10-15 18:09     ` Qian Cai
2019-10-15 18:09     ` Qian Cai
2019-10-16  9:54     ` Anshuman Khandual
2019-10-16  9:54       ` Anshuman Khandual
2019-10-16  9:54       ` Anshuman Khandual
2019-10-16  9:54       ` Anshuman Khandual
2019-10-16  9:54       ` Anshuman Khandual
2019-10-15 14:41 ` [PATCH V6 0/2] " Qian Cai
2019-10-15 14:41   ` Qian Cai
2019-10-15 14:41   ` Qian Cai
2019-10-15 14:41   ` Qian Cai
2019-10-15 14:41   ` Qian Cai
2019-10-15 14:41   ` Qian Cai
2019-10-15 15:21   ` Anshuman Khandual
2019-10-15 15:33     ` Anshuman Khandual
2019-10-15 15:21     ` Anshuman Khandual
2019-10-15 15:21     ` Anshuman Khandual
2019-10-15 15:21     ` Anshuman Khandual
2019-10-15 18:42     ` Qian Cai
2019-10-15 18:42       ` Qian Cai
2019-10-15 18:42       ` Qian Cai
2019-10-15 18:42       ` Qian Cai
2019-10-15 18:42       ` Qian Cai
2019-10-15 18:42       ` Qian Cai
2019-10-16  8:59       ` Anshuman Khandual
2019-10-16  9:11         ` Anshuman Khandual
2019-10-16  8:59         ` Anshuman Khandual
2019-10-16  8:59         ` Anshuman Khandual
2019-10-16  8:59         ` Anshuman Khandual
2019-10-16  8:20     ` Michal Hocko
2019-10-16  8:20       ` Michal Hocko
2019-10-16  8:20       ` Michal Hocko
2019-10-16  8:20       ` Michal Hocko
2019-10-16  8:20       ` Michal Hocko
2019-10-16  8:20       ` Michal Hocko

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