From: Michael Ellerman <mpe@ellerman.id.au>
To: Anton Blanchard <anton@samba.org>,
benh@kernel.crashing.org, paulus@samba.org, mikey@neuling.org,
cyrilbur@gmail.com, scottwood@freescale.com
Cc: linuxppc-dev@lists.ozlabs.org
Subject: Re: [01/19] powerpc: Don't disable kernel FP/VMX/VSX MSR bits on context switch
Date: Mon, 7 Dec 2015 21:30:47 +1100 (AEDT) [thread overview]
Message-ID: <20151207103047.305AD1402D2@ozlabs.org> (raw)
In-Reply-To: <1446079451-8774-2-git-send-email-anton@samba.org>
On Thu, 2015-29-10 at 00:43:53 UTC, Anton Blanchard wrote:
> Writing the MSR is slow, so we want to avoid it whenever possible.
>
> A subsequent patch will add a debug option that strictly manages the
> FP/VMX/VSX unavailable bits. For now just remove it, matching what
> we do in other areas of the kernel (eg enable_kernel_altivec()).
>
> A context switch microbenchmark using yield():
>
> http://ozlabs.org/~anton/junkcode/context_switch2.c
>
> ./context_switch2 --test=yield --fp 0 0
>
> shows an improvement of almost 3% on POWER8.
>
> Signed-off-by: Anton Blanchard <anton@samba.org>
Applied all 19 patches to powerpc next, thanks.
http://git.kernel.org/cgit/linux/kernel/git/powerpc/linux.git/log/?h=next
cheers
next prev parent reply other threads:[~2015-12-07 10:30 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-29 0:43 [PATCH 00/19] Context switch improvements Anton Blanchard
2015-10-29 0:43 ` [PATCH 01/19] powerpc: Don't disable kernel FP/VMX/VSX MSR bits on context switch Anton Blanchard
2015-12-07 10:30 ` Michael Ellerman [this message]
2015-10-29 0:43 ` [PATCH 02/19] powerpc: Don't disable MSR bits in do_load_up_transact_*() functions Anton Blanchard
2015-10-29 0:43 ` [PATCH 03/19] powerpc: Create context switch helpers save_sprs() and restore_sprs() Anton Blanchard
2017-09-02 3:42 ` Benjamin Herrenschmidt
2015-10-29 0:43 ` [PATCH 04/19] powerpc: Remove redundant mflr in _switch Anton Blanchard
2015-10-29 0:43 ` [PATCH 05/19] powerpc: Remove UP only lazy floating point and vector optimisations Anton Blanchard
2015-10-29 0:43 ` [PATCH 06/19] powerpc: Simplify TM restore checks Anton Blanchard
2015-10-29 0:43 ` [PATCH 07/19] powerpc: Create mtmsrd_isync() Anton Blanchard
2015-12-01 11:23 ` Michael Ellerman
2015-12-01 23:25 ` Michael Ellerman
2017-09-02 3:44 ` Benjamin Herrenschmidt
2015-10-29 0:44 ` [PATCH 08/19] powerpc: Remove NULL task struct pointer checks in FP and vector code Anton Blanchard
2015-10-29 0:44 ` [PATCH 09/19] powerpc: Move part of giveup_fpu,altivec,spe into c Anton Blanchard
2015-12-01 11:17 ` Michael Ellerman
2015-10-29 0:44 ` [PATCH 10/19] powerpc: Move part of giveup_vsx " Anton Blanchard
2015-10-29 0:44 ` [PATCH 11/19] crypto: vmx: Only call enable_kernel_vsx() Anton Blanchard
2015-10-29 0:44 ` [PATCH 12/19] powerpc: Create msr_check_and_{set,clear}() Anton Blanchard
2015-10-29 7:25 ` kbuild test robot
2015-10-29 0:44 ` [PATCH 13/19] powerpc: Create disable_kernel_{fp,altivec,vsx,spe}() Anton Blanchard
2015-10-29 0:44 ` [PATCH 14/19] powerpc: Add ppc_strict_facility_enable boot option Anton Blanchard
2017-09-02 3:48 ` Benjamin Herrenschmidt
2015-10-29 0:44 ` [PATCH 15/19] powerpc: Remove fp_enable() and vec_enable(), use msr_check_and_{set, clear}() Anton Blanchard
2015-10-29 0:44 ` [PATCH 16/19] powerpc: create giveup_all() Anton Blanchard
2015-12-02 8:24 ` Michael Ellerman
2015-10-29 0:44 ` [PATCH 17/19] powerpc: create flush_all_to_thread() Anton Blanchard
2015-10-29 0:44 ` [PATCH 18/19] powerpc: Rearrange __switch_to() Anton Blanchard
2015-10-29 0:44 ` [PATCH 19/19] powerpc: clean up asm/switch_to.h Anton Blanchard
2015-12-02 8:42 ` [PATCH 00/19] Context switch improvements Anshuman Khandual
2015-12-02 22:37 ` Michael Neuling
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