Re: [PATCH 07/17] net: convert sock.sk_refcnt from atomic_t to refcount_t

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To: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Subject: Re: [PATCH 07/17] net: convert sock.sk_refcnt from atomic_t to refcount_t
From: Eric Dumazet <eric.dumazet@xxxxxxxxx>
Date: Mon, 20 Mar 2017 07:59:06 -0700
Cc: keescook@xxxxxxxxxxxx, kaber@xxxxxxxxx, netdev@xxxxxxxxxxxxxxx, bridge@xxxxxxxxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, jmorris@xxxxxxxxx, ishkamiel@xxxxxxxxx, kuznet@xxxxxxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, dwindsor@xxxxxxxxx, David Miller <davem@xxxxxxxxxxxxx>, elena.reshetova@xxxxxxxxx, Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Delivered-to: bridge@xxxxxxxxxxxxxxxxxxxxxxxx
In-reply-to: <1490021461.16816.52.camel@edumazet-glaptop3.roam.corp.google.com>

On Mon, 2017-03-20 at 07:51 -0700, Eric Dumazet wrote:

> atomic_cmpxchg() on PowerPC is horribly more expensive because of the
> added two SYNC instructions.

Although I just saw that refcount was using atomic_cmpxchg_relaxed()

Time to find some documentation (probably missing) or get some specs for
this thing.

Follow-Ups:
- Re: [PATCH 07/17] net: convert sock.sk_refcnt from atomic_t to refcount_t
  - From: Eric Dumazet

References:
- Re: [PATCH 07/17] net: convert sock.sk_refcnt from atomic_t to refcount_t
  - From: Eric Dumazet
- Re: [PATCH 07/17] net: convert sock.sk_refcnt from atomic_t to refcount_t
  - From: Herbert Xu
- Re: [PATCH 07/17] net: convert sock.sk_refcnt from atomic_t to refcount_t
  - From: David Miller
- Re: [PATCH 07/17] net: convert sock.sk_refcnt from atomic_t to refcount_t
  - From: Peter Zijlstra
- Re: [PATCH 07/17] net: convert sock.sk_refcnt from atomic_t to refcount_t
  - From: Herbert Xu
- Re: [PATCH 07/17] net: convert sock.sk_refcnt from atomic_t to refcount_t
  - From: Peter Zijlstra
- Re: [PATCH 07/17] net: convert sock.sk_refcnt from atomic_t to refcount_t
  - From: Herbert Xu
- Re: [PATCH 07/17] net: convert sock.sk_refcnt from atomic_t to refcount_t
  - From: Peter Zijlstra
- Re: [PATCH 07/17] net: convert sock.sk_refcnt from atomic_t to refcount_t
  - From: Eric Dumazet

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