From: Christoph Hellwig <hch@infradead.org>
To: "Andrew F. Davis" <afd@ti.com>
Cc: "Laura Abbott" <labbott@redhat.com>,
"Liam Mark" <lmark@codeaurora.org>,
"Sumit Semwal" <sumit.semwal@linaro.org>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Arve Hjønnevåg" <arve@android.com>,
devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org,
dri-devel <dri-devel@lists.freedesktop.org>
Subject: Re: [PATCH 13/14] staging: android: ion: Do not sync CPU cache on map/unmap
Date: Thu, 17 Jan 2019 01:02:43 -0800 [thread overview]
Message-ID: <20190117090243.GA21651@infradead.org> (raw)
In-Reply-To: <99ca0b08-02bd-64fd-d43c-c330f0d11639@ti.com>
On Wed, Jan 16, 2019 at 10:17:23AM -0600, Andrew F. Davis wrote:
> I wouldn't go as far as to remove them just yet.. Liam seems pretty
> adamant that they have valid uses. I'm just not sure performance is one
> of them, maybe in the case of software locks between devices or
> something where there needs to be a lot of back and forth interleaved
> access on small amounts of data?
We shouldn't add unused features to start with. If mainline users for
them appear we can always add them back once we've reviewed the uses
cases and agree that they are sane and have no better solution.
next prev parent reply other threads:[~2019-01-17 9:02 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-11 18:05 [PATCH 00/14] Misc ION cleanups and adding unmapped heap Andrew F. Davis
2019-01-11 18:05 ` [PATCH 01/14] staging: android: ion: Add proper header information Andrew F. Davis
2019-01-11 18:05 ` [PATCH 02/14] staging: android: ion: Remove empty ion_ioctl_dir() function Andrew F. Davis
2019-01-11 18:05 ` [PATCH 03/14] staging: android: ion: Merge ion-ioctl.c into ion.c Andrew F. Davis
2019-01-11 18:05 ` [PATCH 04/14] staging: android: ion: Remove leftover comment Andrew F. Davis
2019-01-11 18:05 ` [PATCH 05/14] staging: android: ion: Remove struct ion_platform_heap Andrew F. Davis
2019-01-11 18:05 ` [PATCH 06/14] staging: android: ion: Fixup some white-space issues Andrew F. Davis
2019-01-11 18:05 ` [PATCH 07/14] staging: android: ion: Sync comment docs with struct ion_buffer Andrew F. Davis
2019-01-11 18:05 ` [PATCH 08/14] staging: android: ion: Remove base from ion_carveout_heap Andrew F. Davis
2019-01-11 18:05 ` [PATCH 09/14] staging: android: ion: Remove base from ion_chunk_heap Andrew F. Davis
2019-01-11 18:05 ` [PATCH 10/14] staging: android: ion: Remove unused headers Andrew F. Davis
2019-01-11 18:05 ` [PATCH 11/14] staging: android: ion: Allow heap name to be null Andrew F. Davis
2019-01-16 15:28 ` Brian Starkey
2019-01-16 17:12 ` Andrew F. Davis
2019-01-18 19:53 ` Laura Abbott
2019-01-21 14:30 ` Andrew F. Davis
2019-01-11 18:05 ` [PATCH 12/14] staging: android: ion: Declare helpers for carveout and chunk heaps Andrew F. Davis
2019-01-18 9:59 ` Greg Kroah-Hartman
2019-01-18 16:09 ` Andrew F. Davis
2019-01-18 19:54 ` Laura Abbott
2019-01-11 18:05 ` [PATCH 13/14] staging: android: ion: Do not sync CPU cache on map/unmap Andrew F. Davis
2019-01-14 17:13 ` Liam Mark
2019-01-15 15:44 ` Andrew F. Davis
2019-01-15 17:45 ` Liam Mark
2019-01-15 18:38 ` Andrew F. Davis
2019-01-15 18:40 ` Andrew F. Davis
2019-01-16 15:19 ` Brian Starkey
2019-01-16 17:05 ` Andrew F. Davis
2019-01-16 22:54 ` Liam Mark
2019-01-17 16:25 ` Andrew F. Davis
2019-01-18 1:11 ` Liam Mark
2019-01-18 17:16 ` Andrew F. Davis
2019-01-21 11:22 ` Brian Starkey
2019-01-21 21:21 ` Andrew F. Davis
2019-01-22 17:33 ` Sumit Semwal
2019-01-23 16:51 ` Andrew F. Davis
2019-01-23 17:11 ` Brian Starkey
2019-01-24 16:04 ` Andrew F. Davis
2019-01-24 16:44 ` Brian Starkey
2019-02-19 21:37 ` Laura Abbott
[not found] ` <CAO_48GHZPkE8Or_dB6CVMi5Jv5eufE_Z36MT7ztJwTqTzkTpKA@mail.gmail.com>
2019-01-23 17:09 ` Andrew F. Davis
2019-01-22 22:56 ` Liam Mark
2019-01-21 20:11 ` Liam Mark
2019-01-15 19:05 ` Laura Abbott
2019-01-16 16:17 ` Andrew F. Davis
2019-01-16 22:48 ` Liam Mark
2019-01-17 16:13 ` Andrew F. Davis
2019-01-18 1:04 ` Liam Mark
2019-01-18 16:50 ` Andrew F. Davis
2019-01-18 21:43 ` Liam Mark
2019-01-21 15:15 ` Andrew F. Davis
2019-01-21 20:04 ` Liam Mark
2019-01-18 20:31 ` Laura Abbott
2019-01-18 20:43 ` Andrew F. Davis
2019-01-18 20:46 ` Laura Abbott
2019-01-19 10:11 ` Christoph Hellwig
2019-01-17 9:02 ` Christoph Hellwig [this message]
2019-01-11 18:05 ` [PATCH 14/14] staging: android: ion: Add UNMAPPED heap type and helper Andrew F. Davis
2019-01-15 2:32 ` Laura Abbott
2019-01-15 15:58 ` Andrew F. Davis
2019-01-15 18:43 ` Laura Abbott
2019-01-15 19:11 ` Laura Abbott
2019-01-16 16:18 ` Andrew F. Davis
2019-01-15 2:39 ` [PATCH 00/14] Misc ION cleanups and adding unmapped heap Laura Abbott
2019-01-15 17:47 ` Andrew F. Davis
2019-01-15 18:58 ` Laura Abbott
2019-01-16 16:05 ` Andrew F. Davis
2019-01-18 20:19 ` Laura Abbott
2019-01-21 14:58 ` Andrew F. Davis
2019-01-18 9:56 ` Greg Kroah-Hartman
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