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From: Mikulas Patocka <mpatocka@redhat.com>
To: Dan Williams <dan.j.williams@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Andrew Morton <akpm@linux-foundation.org>,
	Vishal Verma <vishal.l.verma@intel.com>,
	Dave Jiang <dave.jiang@intel.com>,
	Ira Weiny <ira.weiny@intel.com>,
	Matthew Wilcox <willy@infradead.org>, Jan Kara <jack@suse.cz>,
	Eric Sandeen <esandeen@redhat.com>,
	Dave Chinner <dchinner@redhat.com>,
	"Kani, Toshi" <toshi.kani@hpe.com>,
	"Norton, Scott J" <scott.norton@hpe.com>,
	"Tadakamadla,
	Rajesh (DCIG/CDI/HPS Perf)"  <rajesh.tadakamadla@hpe.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	linux-nvdimm <linux-nvdimm@lists.01.org>
Subject: Re: [PATCH] pmem: export the symbols __copy_user_flushcache and __copy_from_user_flushcache
Date: Wed, 16 Sep 2020 13:24:12 -0400 (EDT)	[thread overview]
Message-ID: <alpine.LRH.2.02.2009161254400.745@file01.intranet.prod.int.rdu2.redhat.com> (raw)
In-Reply-To: <CAPcyv4gW6AvR+RaShHdQzOaEPv9nrq5myXDmywuoCTYDZxk-hw@mail.gmail.com>



On Wed, 16 Sep 2020, Dan Williams wrote:

> On Wed, Sep 16, 2020 at 3:57 AM Mikulas Patocka <mpatocka@redhat.com> wrote:
> >
> >
> >
> > I'm submitting this patch that adds the required exports (so that we could
> > use __copy_from_user_flushcache on x86, arm64 and powerpc). Please, queue
> > it for the next merge window.
> 
> Why? This should go with the first user, and it's not clear that it
> needs to be relative to the current dax_operations export scheme.

Before nvfs gets included in the kernel, I need to distribute it as a 
module. So, it would make my maintenance easier. But if you don't want to 
export it now, no problem, I can just copy __copy_user_flushcache from the 
kernel to the module.

> My first question about nvfs is how it compares to a daxfs with
> executables and other binaries configured to use page cache with the
> new per-file dax facility?

nvfs is faster than dax-based filesystems on metadata-heavy operations 
because it doesn't have the overhead of the buffer cache and bios. See 
this: http://people.redhat.com/~mpatocka/nvfs/BENCHMARKS

Mikulas


  reply	other threads:[~2020-09-16 20:27 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-15 12:34 [RFC] nvfs: a filesystem for persistent memory Mikulas Patocka
2020-09-15 13:00 ` Matthew Wilcox
2020-09-15 13:24   ` Mikulas Patocka
2020-09-22 10:04   ` Ritesh Harjani
2020-09-15 15:16 ` Dan Williams
2020-09-15 16:58   ` Mikulas Patocka
2020-09-15 17:38     ` Mikulas Patocka
2020-09-16 10:57       ` [PATCH] pmem: export the symbols __copy_user_flushcache and __copy_from_user_flushcache Mikulas Patocka
2020-09-16 16:21         ` Dan Williams
2020-09-16 17:24           ` Mikulas Patocka [this message]
2020-09-16 17:40             ` Dan Williams
2020-09-16 18:06               ` Mikulas Patocka
2020-09-21 16:20                 ` NVFS XFS metadata (was: [PATCH] pmem: export the symbols __copy_user_flushcache and __copy_from_user_flushcache) Mikulas Patocka
2020-09-22  5:03                   ` Dave Chinner
2020-09-22 16:46                     ` Mikulas Patocka
2020-09-22 17:25                       ` Matthew Wilcox
2020-09-24 15:00                         ` Mikulas Patocka
2020-09-28 15:22                           ` Mikulas Patocka
2020-09-23  2:45                       ` Dave Chinner
2020-09-23  9:20                         ` A bug in ext4 with big directories (was: NVFS XFS metadata) Mikulas Patocka
2020-09-23  9:44                           ` Jan Kara
2020-09-23 12:46                             ` Mikulas Patocka
2020-09-23 20:20                             ` Andreas Dilger
2020-09-23 17:19                         ` NVFS XFS metadata (was: [PATCH] pmem: export the symbols __copy_user_flushcache and __copy_from_user_flushcache) Mikulas Patocka
2020-09-23  9:57                       ` Jan Kara
2020-09-23 13:11                         ` Mikulas Patocka
2020-09-23 15:04                           ` Matthew Wilcox
2020-09-22 12:28                   ` Matthew Wilcox
2020-09-22 12:39                     ` Mikulas Patocka
2020-09-16 18:56               ` [PATCH] pmem: fix __copy_user_flushcache Mikulas Patocka
2020-09-18  1:53                 ` Dan Williams
2020-09-18 12:25                   ` the "read" syscall sees partial effects of the "write" syscall Mikulas Patocka
2020-09-18 13:13                     ` Jan Kara
2020-09-18 18:02                       ` Linus Torvalds
2020-09-20 23:41                       ` Dave Chinner
2020-09-17  6:50               ` [PATCH] pmem: export the symbols __copy_user_flushcache and __copy_from_user_flushcache Christoph Hellwig
2020-09-21 16:19   ` [RFC] nvfs: a filesystem for persistent memory Mikulas Patocka
2020-09-21 16:29     ` Dan Williams
2020-09-22 15:43     ` Ira Weiny

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