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From: Nicholas Piggin <npiggin@gmail.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Balbir Singh <bsingharora@gmail.com>,
	linuxppc-dev@lists.ozlabs.org, Anton Blanchard <anton@samba.org>
Subject: Re: [PATCH] powerpc/64: implement a slice mask cache
Date: Mon, 25 Jul 2016 12:28:01 +1000	[thread overview]
Message-ID: <20160725122801.578622d6@roar.ozlabs.ibm.com> (raw)
In-Reply-To: <1469263746.8568.185.camel@kernel.crashing.org>

On Sat, 23 Jul 2016 18:49:06 +1000
Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote:

> On Sat, 2016-07-23 at 17:10 +1000, Nicholas Piggin wrote:
> > I wanted to avoid doing more work under slice_convert_lock, but
> > we should just make that a per-mm lock anyway shouldn't we?  
> 
> Aren't the readers under the mm sem taken for writing or has this
> changed ?


I don't think this has changed, but I look at the writers now,
which aren't synchronized by mm sem. But neither are readers
under the slice_convert_lock, so I'm looking at what the locking
actually is. Is it just using atomicity of dword stores vs loads?

Thanks,
Nick

  reply	other threads:[~2016-07-25  2:28 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-07-22 12:57 [PATCH] powerpc/64: implement a slice mask cache Nicholas Piggin
2016-07-23  2:19 ` Balbir Singh
2016-07-23  7:10   ` Nicholas Piggin
2016-07-23  8:49     ` Benjamin Herrenschmidt
2016-07-25  2:28       ` Nicholas Piggin [this message]
2016-07-23 10:36     ` Balbir Singh
2016-07-25  4:35       ` Nicholas Piggin

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