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From: "gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>
To: Dave Hansen <dave.hansen@intel.com>
Cc: "Song Bao Hua (Barry Song)" <song.bao.hua@hisilicon.com>,
	"tiantao (H)" <tiantao6@hisilicon.com>,
	"corbet@lwn.net" <corbet@lwn.net>,
	"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"Rafael J. Wysocki" <rafael@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Valentin Schneider <valentin.schneider@arm.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Daniel Bristot de Oliveira <bristot@redhat.com>
Subject: Re: [PATCH 1/2] CPU, NUMA topology ABIs: clarify the overflow issue of sysfs pagebuf
Date: Fri, 30 Apr 2021 08:05:45 +0200	[thread overview]
Message-ID: <YIueOR4fOYa1dSAb@kroah.com> (raw)
In-Reply-To: <fd78ac30-dd3b-a7d7-eae8-193b09a7d49a@intel.com>

On Thu, Apr 29, 2021 at 03:38:39PM -0700, Dave Hansen wrote:
> On 4/29/21 3:32 PM, Song Bao Hua (Barry Song) wrote:
> > $ strace numactl --hardware  2>&1 | grep cpu
> > openat(AT_FDCWD, "/sys/devices/system/cpu",
> > O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 3
> > openat(AT_FDCWD, "/sys/devices/system/node/node0/cpumap", O_RDONLY) = 3
> > openat(AT_FDCWD, "/sys/devices/system/node/node1/cpumap", O_RDONLY) = 3
> > openat(AT_FDCWD, "/sys/devices/system/node/node2/cpumap", O_RDONLY) = 3
> > openat(AT_FDCWD, "/sys/devices/system/node/node3/cpumap", O_RDONLY) = 3
> > 
> > If we move to binary, it means we have to change those applications.
> 
> I thought Greg was saying to using a sysfs binary attribute using
> something like like sysfs_create_bin_file().  Those don't have the
> PAGE_SIZE limitation.  But, there's also nothing to keep us from spewing
> nice human-readable text via the "binary" file.

That is correct.


  parent reply	other threads:[~2021-04-30  6:05 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-29  7:03 [PATCH 0/2] clarify and cleanup CPU and NUMA topology ABIs Tian Tao
2021-04-29  7:03 ` [PATCH 1/2] CPU, NUMA topology ABIs: clarify the overflow issue of sysfs pagebuf Tian Tao
2021-04-29 14:21   ` Dave Hansen
2021-04-29 15:46     ` Greg KH
2021-04-29 21:08     ` Song Bao Hua (Barry Song)
2021-04-29 21:38       ` Dave Hansen
2021-04-29 22:32         ` Song Bao Hua (Barry Song)
2021-04-29 22:38           ` Dave Hansen
2021-04-29 22:48             ` Song Bao Hua (Barry Song)
2021-04-30  6:05             ` gregkh [this message]
2021-07-23 11:20             ` Song Bao Hua (Barry Song)
2021-07-23 11:28               ` gregkh
2021-07-23 12:48                 ` Song Bao Hua (Barry Song)
2021-05-06 23:16   ` kernel test robot
2021-04-29  7:03 ` [PATCH 2/2] Documentation/ABI: Move the topology-related sysfs interface to the right place Tian Tao

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