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Date: Wed, 29 Mar 2017 10:38:10 +0200 From: Laurent Dufour <ldufour@...ux.vnet.ibm.com> To: "Kirill A. Shutemov" <kirill@...temov.name>, Davidlohr Bueso <dave@...olabs.net> Cc: mingo@...nel.org, peterz@...radead.org, akpm@...ux-foundation.org, jack@...e.cz, kirill.shutemov@...ux.intel.com, mhocko@...e.com, mgorman@...hsingularity.net, linux-kernel@...r.kernel.org, Davidlohr Bueso <dbueso@...e.de> Subject: Re: [PATCH 1/5] locking: Introduce range reader/writer lock On 28/03/2017 18:58, Kirill A. Shutemov wrote: > On Tue, Mar 28, 2017 at 09:39:18AM -0700, Davidlohr Bueso wrote: >> I'll wait to see if there are any more concerns and send a v2 with your corrections. > > Have you tried drop-in replacement of mmap_sem with full range lock? > It would be interesting to see performance implication for this. > I've a patch that replace the mmap_sem with a full range lock, it seems to work fine for x86 and ppc64 for now. I'll send it soon. But I didn't yet check for performance. What is the best way to that ?
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