linux-kernel - Re: [PATCH 18/40] autonuma: call autonuma_setup_new

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Message-ID: <20120630050425.GE3975@localhost.localdomain>
Date:	Sat, 30 Jun 2012 01:04:26 -0400
From:	Konrad Rzeszutek Wilk <konrad@...nok.org>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Hillf Danton <dhillf@...il.com>, Dan Smith <danms@...ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Mike Galbraith <efault@....de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Bharata B Rao <bharata.rao@...il.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Christoph Lameter <cl@...ux.com>,
	Alex Shi <alex.shi@...el.com>,
	Mauricio Faria de Oliveira <mauricfo@...ux.vnet.ibm.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Don Morris <don.morris@...com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [PATCH 18/40] autonuma: call autonuma_setup_new_exec()

On Thu, Jun 28, 2012 at 02:55:58PM +0200, Andrea Arcangeli wrote:
> This resets all per-thread and per-process statistics across exec
> syscalls or after kernel threads detached from the mm. The past
> statistical NUMA information is unlikely to be relevant for the future
> in these cases.

The previous patch mentioned that it can run in bypass mode. Is
this also able to do so? Meaning that these calls end up doing nops?

Thanks!
> 
> Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
> ---
>  fs/exec.c        |    3 +++
>  mm/mmu_context.c |    2 ++
>  2 files changed, 5 insertions(+), 0 deletions(-)
> 
> diff --git a/fs/exec.c b/fs/exec.c
> index da27b91..146ced2 100644
> --- a/fs/exec.c
> +++ b/fs/exec.c
> @@ -55,6 +55,7 @@
>  #include <linux/pipe_fs_i.h>
>  #include <linux/oom.h>
>  #include <linux/compat.h>
> +#include <linux/autonuma.h>
>  
>  #include <asm/uaccess.h>
>  #include <asm/mmu_context.h>
> @@ -1172,6 +1173,8 @@ void setup_new_exec(struct linux_binprm * bprm)
>  			
>  	flush_signal_handlers(current, 0);
>  	flush_old_files(current->files);
> +
> +	autonuma_setup_new_exec(current);
>  }
>  EXPORT_SYMBOL(setup_new_exec);
>  
> diff --git a/mm/mmu_context.c b/mm/mmu_context.c
> index 3dcfaf4..40f0f13 100644
> --- a/mm/mmu_context.c
> +++ b/mm/mmu_context.c
> @@ -7,6 +7,7 @@
>  #include <linux/mmu_context.h>
>  #include <linux/export.h>
>  #include <linux/sched.h>
> +#include <linux/autonuma.h>
>  
>  #include <asm/mmu_context.h>
>  
> @@ -58,5 +59,6 @@ void unuse_mm(struct mm_struct *mm)
>  	/* active_mm is still 'mm' */
>  	enter_lazy_tlb(mm, tsk);
>  	task_unlock(tsk);
> +	autonuma_setup_new_exec(tsk);
>  }
>  EXPORT_SYMBOL_GPL(unuse_mm);
> 
> --
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> 
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