From: peterz@infradead.org (Peter Zijlstra)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC PATCH V3 3/6] arm: mm: implement get_user_pages_fast
Date: Wed, 12 Mar 2014 17:30:26 +0100 [thread overview]
Message-ID: <20140312163026.GI27965@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <CAPvkgC1sphjikAaUXSEyRMiQ+wDNwgTw-mhL++DzBLGBqMdtTg@mail.gmail.com>
On Wed, Mar 12, 2014 at 04:20:15PM +0000, Steve Capper wrote:
> On 12 March 2014 14:18, Peter Zijlstra <peterz@infradead.org> wrote:
> > Since you just went through the trouble of enabling RCU pagetable
> > freeing, you might also replace these local_irq_save/restore with
> > rcu_read_{,un}lock().
>
> Hi Peter,
> This critical section also needs to block the THP splitting code. At
> the moment an IPI is broadcast in pmdp_splitting_flush. I'm not sure
> how to adapt that to block on an rcu_read_lock, I'll have a think.
Ah, I've not looked at THP much at all.
Would it be sufficient to make sure to fail the pmd get_page()
equivalent early enough?
next prev parent reply other threads:[~2014-03-12 16:30 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-12 13:40 [RFC PATCH V3 0/6] get_user_pages_fast for ARM and ARM64 Steve Capper
2014-03-12 13:40 ` [RFC PATCH V3 1/6] arm: mm: Introduce special ptes for LPAE Steve Capper
2014-03-12 13:40 ` [RFC PATCH V3 2/6] arm: mm: Enable HAVE_RCU_TABLE_FREE logic Steve Capper
2014-03-12 13:40 ` [RFC PATCH V3 3/6] arm: mm: implement get_user_pages_fast Steve Capper
2014-03-12 14:18 ` Peter Zijlstra
2014-03-12 16:20 ` Steve Capper
2014-03-12 16:30 ` Peter Zijlstra [this message]
2014-03-12 16:42 ` Steve Capper
2014-03-12 16:32 ` Peter Zijlstra
2014-03-12 16:41 ` Steve Capper
2014-03-12 16:55 ` Will Deacon
2014-03-12 17:11 ` Peter Zijlstra
2014-03-14 11:47 ` Peter Zijlstra
2014-03-13 8:24 ` Steve Capper
2014-03-12 17:15 ` Catalin Marinas
2014-03-13 8:03 ` Steve Capper
2014-03-12 13:40 ` [RFC PATCH V3 4/6] arm64: Convert asm/tlb.h to generic mmu_gather Steve Capper
2014-03-12 13:40 ` [RFC PATCH V3 5/6] arm64: mm: Enable HAVE_RCU_TABLE_FREE logic Steve Capper
2014-03-12 13:40 ` [RFC PATCH V3 6/6] arm64: mm: Activate get_user_pages_fast for arm64 Steve Capper
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