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Date: Sun, 19 Mar 2017 00:37:02 +0800 From: Herbert Xu <herbert@...dor.apana.org.au> To: Andrew Morton <akpm@...ux-foundation.org> Cc: elena.reshetova@...el.com, linux-kernel@...r.kernel.org, linux-mm@...ck.org, peterz@...radead.org, gregkh@...uxfoundation.org, viro@...iv.linux.org.uk, catalin.marinas@....com, mingo@...hat.com, arnd@...db.de, luto@...nel.org, "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org Subject: Re: [PATCH 0/5] mm subsystem refcounter conversions Andrew Morton <akpm@...ux-foundation.org> wrote: > > The performance implications of this proposal are terrifying. > > I suggest adding a set of non-debug inlined refcount functions which > just fall back to the simple atomic.h operations. > > And add a new CONFIG_DEBUG_REFCOUNT. So the performance (and code > size!) with CONFIG_DEBUG_REFCOUNT=n is unaltered from present code. > And make CONFIG_DEBUG_REFCOUNT suitably difficult to set. I agree. Refcounts are used in many performance-critical sites within the network subsystem. Thanks, -- Email: Herbert Xu <herbert@...dor.apana.org.au> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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