From: Michael Ellerman <mpe@ellerman•id.au>
To: Michael Neuling <mikey@neuling•org>, benh@kernel•crashing.org
Cc: linuxppc-dev@ozlabs•org, anton@samba•org, Cyril Bur <cyrilbur@gmail•com>
Subject: Re: [PATCH v2 2/2] powerpc: Copy only required pieces of the mm_context_t to the paca
Date: Thu, 10 Dec 2015 21:00:23 +1100 [thread overview]
Message-ID: <1449741623.7156.3.camel@ellerman.id.au> (raw)
In-Reply-To: <1449719211.29188.5.camel@neuling.org>
On Thu, 2015-12-10 at 14:46 +1100, Michael Neuling wrote:
> Currently we copy the whole mm_context_t to the paca but only access a
> few bits of it. This is wasteful of space paca and also takes quite
> some time in the hot path of context switching.
>
> diff --git a/arch/powerpc/include/asm/paca.h
> b/arch/powerpc/include/asm/paca.h
> index 1cc6e08..06cdaee 100644
> --- a/arch/powerpc/include/asm/paca.h
> +++ b/arch/powerpc/include/asm/paca.h
> @@ -199,7 +206,14 @@ struct paca_struct {
> #ifdef CONFIG_PPC_BOOK3S
> static inline void copy_mm_to_paca(mm_context_t *context)
> {
> - get_paca()->context = *context;
> + get_paca()->context_id = context->id;
> +#ifdef CONFIG_PPC_MM_SLICES
> + get_paca()->context_low_slices_psize = context
> ->low_slices_psize;
Patch is wrapped ^
And so on.
cheers
next prev parent reply other threads:[~2015-12-10 10:00 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-28 4:54 [PATCH 1/2] powerpc: Add function to copy mm_context_t to the paca Michael Neuling
2015-10-28 4:54 ` [PATCH 2/2] powerpc: Copy only required pieces of the " Michael Neuling
2015-12-09 12:17 ` Anton Blanchard
2015-12-10 3:46 ` [PATCH v2 " Michael Neuling
2015-12-10 10:00 ` Michael Ellerman [this message]
2015-12-10 22:34 ` [PATCH v3 " Michael Neuling
2016-01-11 9:14 ` [v3, " Michael Ellerman
2016-01-11 9:14 ` [1/2] powerpc: Add function to copy " Michael Ellerman
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