From: Christoph Hellwig <hch@infradead.org>
To: john.hubbard@gmail.com
Cc: pavel@ucw.cz, SCheung@nvidia.com, akpm@linux-foundation.org,
aneesh.kumar@linux.vnet.ibm.com, benh@kernel.crashing.org,
bsingharora@gmail.com, dan.j.williams@intel.com,
dnellans@nvidia.com, ebaskakov@nvidia.com, hannes@cmpxchg.org,
jglisse@redhat.com, jhubbard@nvidia.com,
kirill.shutemov@linux.intel.com, linux-kernel@vger.kernel.org,
liubo95@huawei.com, mhairgrove@nvidia.com, mhocko@kernel.org,
paulmck@linux.vnet.ibm.com, ross.zwisler@linux.intel.com,
sgutti@nvidia.com, torvalds@linux-foundation.org,
vdavydov.dev@gmail.com, Jason Gunthorpe <jgg@ziepe.ca>,
Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH] mm/Kconfig: additional help text for HMM_MIRROR option
Date: Thu, 18 Jul 2019 22:57:48 -0700 [thread overview]
Message-ID: <20190719055748.GA29082@infradead.org> (raw)
In-Reply-To: <20190719013253.17642-1-jhubbard@nvidia.com>
On Thu, Jul 18, 2019 at 06:32:53PM -0700, john.hubbard@gmail.com wrote:
> + HMM_MIRROR provides a way to mirror ranges of the CPU page tables
> + of a process into a device page table. Here, mirror means "keep
> + synchronized". Prerequisites: the device must provide the ability
> + to write-protect its page tables (at PAGE_SIZE granularity), and
> + must be able to recover from the resulting potential page faults.
> +
> + Select HMM_MIRROR if you have hardware that meets the above
> + description. An early, partial list of such hardware is:
> + an NVIDIA GPU >= Pascal, Mellanox IB >= mlx5, or an AMD GPU.
Nevermind that the Nvidia support is stagaging and looks rather broken,
there is no Mellanox user of this either at this point.
But either way this has no business in a common kconfig help. Just
drop the fine grained details and leave it to the overview.
next prev parent reply other threads:[~2019-07-19 5:58 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-17 7:41 HMM_MIRROR has less than useful help text Pavel Machek
2019-07-18 11:03 ` Balbir Singh
2019-07-18 14:25 ` Dan Williams
2019-07-18 16:36 ` Pavel Machek
2019-07-19 1:32 ` [PATCH] mm/Kconfig: additional help text for HMM_MIRROR option john.hubbard
2019-07-19 4:34 ` Ira Weiny
2019-07-19 5:15 ` John Hubbard
2019-07-19 5:57 ` Christoph Hellwig [this message]
2019-07-19 10:52 ` Pavel Machek
2019-07-19 11:48 ` Jason Gunthorpe
2019-07-19 12:00 ` Christoph Hellwig
2019-07-19 12:04 ` Pavel Machek
2019-07-19 20:38 ` John Hubbard
2019-07-22 11:58 ` Jason Gunthorpe
2019-07-22 12:01 ` Christoph Hellwig
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