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From: John Hubbard <jhubbard@nvidia.com>
To: Leonardo Bras <leonardo@linux.ibm.com>,
	<linuxppc-dev@lists.ozlabs.org>, <linux-kernel@vger.kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Arnd Bergmann <arnd@arndb.de>,
	Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>,
	"Christophe Leroy" <christophe.leroy@c-s.fr>,
	Andrew Morton <akpm@linux-foundation.org>,
	Dan Williams <dan.j.williams@intel.com>,
	Nicholas Piggin <npiggin@gmail.com>,
	Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Richard Fontana <rfontana@redhat.com>,
	Ganesh Goudar <ganeshgr@linux.ibm.com>,
	Allison Randal <allison@lohutok.net>,
	"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
	Mike Rapoport <rppt@linux.ibm.com>,
	YueHaibing <yuehaibing@huawei.com>,
	Ira Weiny <ira.weiny@intel.com>, Jason Gunthorpe <jgg@ziepe.ca>,
	Keith Busch <keith.busch@intel.com>,
	Linux-MM <linux-mm@kvack.org>
Subject: Re: [PATCH v2 02/11] asm-generic/pgtable: Adds dummy functions to monitor lockless pgtable walks
Date: Mon, 23 Sep 2019 13:53:31 -0700	[thread overview]
Message-ID: <0339a482-48b9-ca22-ff13-4892500844dc@nvidia.com> (raw)
In-Reply-To: <007934281451e843a0428dc1e674f9dae149b75b.camel@linux.ibm.com>

On 9/23/19 1:48 PM, Leonardo Bras wrote:
> Thanks for the feedback,
> 
> On Mon, 2019-09-23 at 13:39 -0700, John Hubbard wrote:
>> Please remember to include linux-mm if there is a v2.
> 
> Sure, I will include on v3.
> 
>> Nit: seems like it would be nicer to just put it all in one place, and use
>> positive logic, and also I think people normally don't compress the empty
>> functions quite that much. So like this:
> 
> I did this by following the default on the rest of this file.
> As you can see, all other features use the standard of 
> #ifndef SOMETHING
> dummy/generic functions
> #endif
> 
> Declaring the functions become responsibility of the arch.

I noticed that, but...well, I guess you're right.  Follow the way
it is. :)

thanks,
-- 
John Hubbard
NVIDIA

> 
>> #ifdef __HAVE_ARCH_LOCKLESS_PGTBL_WALK_COUNTER
>> void start_lockless_pgtbl_walk(struct mm_struct *mm); 
>> void end_lockless_pgtbl_walk(struct mm_struct *mm); 
>> int running_lockless_pgtbl_walk(struct mm_struct *mm); 
>>
>> #else
>> static inline void start_lockless_pgtbl_walk(struct mm_struct *mm)
>> {
>> }
>> static inline void end_lockless_pgtbl_walk(struct mm_struct *mm)
>> {
>> }
>> static inline int running_lockless_pgtbl_walk(struct mm_struct *mm)
>> {
>>         return 0;
>> }
>> #endif
>>
>> thanks,


WARNING: multiple messages have this Message-ID (diff)
From: John Hubbard <jhubbard@nvidia.com>
To: Leonardo Bras <leonardo@linux.ibm.com>,
	<linuxppc-dev@lists.ozlabs.org>, <linux-kernel@vger.kernel.org>
Cc: Jason Gunthorpe <jgg@ziepe.ca>,
	Thomas Gleixner <tglx@linutronix.de>,
	Arnd Bergmann <arnd@arndb.de>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	YueHaibing <yuehaibing@huawei.com>,
	Keith Busch <keith.busch@intel.com>,
	Nicholas Piggin <npiggin@gmail.com>,
	Mike Rapoport <rppt@linux.ibm.com>,
	Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>,
	Richard Fontana <rfontana@redhat.com>,
	Linux-MM <linux-mm@kvack.org>, Paul Mackerras <paulus@samba.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
	Ganesh Goudar <ganeshgr@linux.ibm.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Ira Weiny <ira.weiny@intel.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Allison Randal <allison@lohutok.net>
Subject: Re: [PATCH v2 02/11] asm-generic/pgtable: Adds dummy functions to monitor lockless pgtable walks
Date: Mon, 23 Sep 2019 13:53:31 -0700	[thread overview]
Message-ID: <0339a482-48b9-ca22-ff13-4892500844dc@nvidia.com> (raw)
In-Reply-To: <007934281451e843a0428dc1e674f9dae149b75b.camel@linux.ibm.com>

On 9/23/19 1:48 PM, Leonardo Bras wrote:
> Thanks for the feedback,
> 
> On Mon, 2019-09-23 at 13:39 -0700, John Hubbard wrote:
>> Please remember to include linux-mm if there is a v2.
> 
> Sure, I will include on v3.
> 
>> Nit: seems like it would be nicer to just put it all in one place, and use
>> positive logic, and also I think people normally don't compress the empty
>> functions quite that much. So like this:
> 
> I did this by following the default on the rest of this file.
> As you can see, all other features use the standard of 
> #ifndef SOMETHING
> dummy/generic functions
> #endif
> 
> Declaring the functions become responsibility of the arch.

I noticed that, but...well, I guess you're right.  Follow the way
it is. :)

thanks,
-- 
John Hubbard
NVIDIA

> 
>> #ifdef __HAVE_ARCH_LOCKLESS_PGTBL_WALK_COUNTER
>> void start_lockless_pgtbl_walk(struct mm_struct *mm); 
>> void end_lockless_pgtbl_walk(struct mm_struct *mm); 
>> int running_lockless_pgtbl_walk(struct mm_struct *mm); 
>>
>> #else
>> static inline void start_lockless_pgtbl_walk(struct mm_struct *mm)
>> {
>> }
>> static inline void end_lockless_pgtbl_walk(struct mm_struct *mm)
>> {
>> }
>> static inline int running_lockless_pgtbl_walk(struct mm_struct *mm)
>> {
>>         return 0;
>> }
>> #endif
>>
>> thanks,

  reply	other threads:[~2019-09-23 20:53 UTC|newest]

Thread overview: 70+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-20 19:50 [PATCH v2 00/11] Introduces new count-based method for monitoring lockless pagetable wakls Leonardo Bras
2019-09-20 19:50 ` Leonardo Bras
2019-09-20 19:50 ` [PATCH v2 01/11] powerpc/mm: Adds counting method to monitor lockless pgtable walks Leonardo Bras
2019-09-20 19:50   ` Leonardo Bras
2019-09-23 20:42   ` John Hubbard
2019-09-23 20:42     ` John Hubbard
2019-09-23 20:50     ` Leonardo Bras
2019-09-23 20:50       ` Leonardo Bras
2019-09-20 19:50 ` [PATCH v2 02/11] asm-generic/pgtable: Adds dummy functions " Leonardo Bras
2019-09-20 19:50   ` Leonardo Bras
2019-09-23 20:39   ` John Hubbard
2019-09-23 20:39     ` John Hubbard
2019-09-23 20:48     ` Leonardo Bras
2019-09-23 20:48       ` Leonardo Bras
2019-09-23 20:53       ` John Hubbard [this message]
2019-09-23 20:53         ` John Hubbard
2019-09-20 19:50 ` [PATCH v2 03/11] mm/gup: Applies counting method to monitor gup_pgd_range Leonardo Bras
2019-09-20 19:50   ` Leonardo Bras
2019-09-23 20:27   ` John Hubbard
2019-09-23 20:27     ` John Hubbard
2019-09-23 21:01     ` Leonardo Bras
2019-09-23 21:01       ` Leonardo Bras
2019-09-23 21:09       ` John Hubbard
2019-09-23 21:09         ` John Hubbard
2019-09-20 19:50 ` [PATCH v2 04/11] powerpc/mce_power: Applies counting method to monitor lockless pgtbl walks Leonardo Bras
2019-09-20 19:50   ` Leonardo Bras
2019-09-20 19:50 ` [PATCH v2 05/11] powerpc/perf: " Leonardo Bras
2019-09-20 19:50   ` Leonardo Bras
2019-09-20 19:50 ` [PATCH v2 06/11] powerpc/mm/book3s64/hash: " Leonardo Bras
2019-09-20 19:50   ` Leonardo Bras
2019-09-20 19:50 ` [PATCH v2 07/11] powerpc/kvm/e500: " Leonardo Bras
2019-09-20 19:50   ` Leonardo Bras
2019-09-20 19:50 ` [PATCH v2 08/11] powerpc/kvm/book3s_hv: " Leonardo Bras
2019-09-20 19:50   ` Leonardo Bras
2019-09-23 20:47   ` John Hubbard
2019-09-23 20:47     ` John Hubbard
2019-09-20 19:50 ` [PATCH v2 09/11] powerpc/kvm/book3s_64: " Leonardo Bras
2019-09-20 19:50   ` Leonardo Bras
2019-09-20 19:50 ` [PATCH v2 10/11] powerpc/book3s_64: Enables counting method to monitor lockless pgtbl walk Leonardo Bras
2019-09-20 19:50   ` Leonardo Bras
2019-09-20 19:50 ` [PATCH v2 11/11] powerpc/mm/book3s64/pgtable: Uses counting method to skip serializing Leonardo Bras
2019-09-20 19:50   ` Leonardo Bras
2019-09-20 20:11   ` John Hubbard
2019-09-20 20:28     ` Leonardo Bras
2019-09-20 20:28       ` Leonardo Bras
2019-09-20 21:15       ` John Hubbard
2019-09-21  0:48       ` John Hubbard
2019-09-21  0:48         ` John Hubbard
2019-09-23 17:25         ` Leonardo Bras
2019-09-23 17:25           ` Leonardo Bras
2019-09-23 18:14           ` John Hubbard
2019-09-23 18:14             ` John Hubbard
2019-09-23 19:40             ` Leonardo Bras
2019-09-23 19:40               ` Leonardo Bras
2019-09-23 19:58               ` John Hubbard
2019-09-23 19:58                 ` John Hubbard
2019-09-23 20:23                 ` Leonardo Bras
2019-09-23 20:23                   ` Leonardo Bras
2019-09-23 20:26                   ` John Hubbard
2019-09-23 20:26                     ` John Hubbard
2019-09-20 19:56 ` [PATCH v2 00/11] Introduces new count-based method for monitoring lockless pagetable wakls Leonardo Bras
2019-09-20 19:56   ` Leonardo Bras
2019-09-20 20:12 ` Leonardo Bras
2019-09-20 20:12   ` Leonardo Bras
2019-09-20 21:24   ` John Hubbard
2019-09-20 21:24     ` John Hubbard
2019-09-23 20:51   ` John Hubbard
2019-09-23 20:51     ` John Hubbard
2019-09-23 20:58     ` Leonardo Bras
2019-09-23 20:58       ` Leonardo Bras

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