From: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
To: Or Gerlitz <ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Cc: Sagi Grimberg
<sagig-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>,
"linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: merge struct ib_device_attr into struct ib_device V2
Date: Wed, 21 Oct 2015 09:43:35 +0200 [thread overview]
Message-ID: <20151021074335.GA19775@lst.de> (raw)
In-Reply-To: <56274199.1030800-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
On Wed, Oct 21, 2015 at 10:41:13AM +0300, Or Gerlitz wrote:
> I know, but a patch that adds caching an attr pointer on the device will
> remove these local caches,
> we actually had that/similar patch posted here and it was dropped/forgotten.
>
>> so if you use one of those you're
>> already having one of them per device. If you use two of them you
>> have multiple copies plus individual fields caches by other ULDs and core
>> code.
>
> again, the method I propose does remove these duplications all together.
>
> I am still waiting to hear what is the precise argument for having this
> change.
It does everything the pointer does, but in addition saves memory (no
rounding up of the slab size), reduces pointer chasing and makes and API
that's easier to use and more similar to how all other major Linux subsystems
work.
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next prev parent reply other threads:[~2015-10-21 7:43 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-12 6:57 merge struct ib_device_attr into struct ib_device V2 Christoph Hellwig
[not found] ` <1444633078-27166-1-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2015-10-12 6:57 ` [PATCH] IB: merge struct ib_device_attr into struct ib_device Christoph Hellwig
2015-10-12 9:26 ` merge struct ib_device_attr into struct ib_device V2 Sagi Grimberg
[not found] ` <561B7CAE.3040505-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2015-10-12 14:42 ` Christoph Hellwig
[not found] ` <20151012144212.GB24770-jcswGhMUV9g@public.gmane.org>
2015-10-20 12:00 ` Sagi Grimberg
[not found] ` <56262CF9.1040509-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2015-10-20 12:53 ` Or Gerlitz
[not found] ` <CAJ3xEMhEE=Qp=LcYQYJB3rjfhdgd28QG_ZXbpFUCUubGD2uAGQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-10-20 13:08 ` Sagi Grimberg
[not found] ` <56263CE6.5010005-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2015-10-20 13:22 ` Christoph Hellwig
2015-10-20 14:08 ` Or Gerlitz
[not found] ` <CAJ3xEMjmfNmiTiNctobN=BKvwB-oaMZtBxdqL5zVyvvG_M1KiQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-10-20 15:00 ` Sagi Grimberg
[not found] ` <56265702.1030209-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2015-10-20 15:07 ` Or Gerlitz
[not found] ` <CAJ3xEMh12RjU9ws3r5djigHdkMGnT35+uouRAMzGxj2jhmgKFA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-10-20 15:13 ` Sagi Grimberg
[not found] ` <56265A1F.6090204-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2015-10-20 15:39 ` Or Gerlitz
2015-10-21 6:40 ` Christoph Hellwig
2015-10-21 6:38 ` Christoph Hellwig
[not found] ` <20151021063830.GA19027-jcswGhMUV9g@public.gmane.org>
2015-10-21 6:44 ` Or Gerlitz
[not found] ` <56273459.6050007-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2015-10-21 6:51 ` Christoph Hellwig
[not found] ` <20151021065134.GA19210-jcswGhMUV9g@public.gmane.org>
2015-10-21 7:11 ` Or Gerlitz
[not found] ` <56273AA1.6060607-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2015-10-21 7:33 ` Christoph Hellwig
[not found] ` <20151021073338.GA19626-jcswGhMUV9g@public.gmane.org>
2015-10-21 7:41 ` Or Gerlitz
[not found] ` <56274199.1030800-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2015-10-21 7:43 ` Christoph Hellwig [this message]
2015-10-21 15:48 ` Bart Van Assche
[not found] ` <5627B3BA.7060700-XdAiOPVOjttBDgjK7y7TUQ@public.gmane.org>
2015-10-21 16:43 ` Jason Gunthorpe
[not found] ` <20151021164356.GA17666-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2015-10-21 17:21 ` Steve Wise
2015-10-21 18:08 ` Or Gerlitz
[not found] ` <CAJ3xEMh3pE61sNaZKBr8k47Lb52cUc=n4JToXvvKyrTTu3WW2Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-10-21 18:20 ` Jason Gunthorpe
[not found] ` <20151021182019.GB15771-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2015-10-21 18:50 ` Or Gerlitz
2015-10-27 13:40 ` Sagi Grimberg
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