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: [PATCH 16/19] powerpc: create giveup_all()
Date: Wed, 02 Dec 2015 19:24:02 +1100 [thread overview]
Message-ID: <1449044642.24750.4.camel@ellerman.id.au> (raw)
In-Reply-To: <1446079451-8774-17-git-send-email-anton@samba.org>
On Thu, 2015-10-29 at 11:44 +1100, Anton Blanchard wrote:
> Create a single function that gives everything up (FP, VMX, VSX, SPE).
> Doing this all at once means we only do one MSR write.
>
> A context switch microbenchmark using yield():
>
> http://ozlabs.org/~anton/junkcode/context_switch2.c
>
> ./context_switch2 --test=yield --fp --altivec --vector 0 0
>
> shows an improvement of 3% on POWER8.
>
> Signed-off-by: Anton Blanchard <anton@samba•org>
> ---
> arch/powerpc/include/asm/switch_to.h | 1 +
> arch/powerpc/kernel/process.c | 75 ++++++++++++++++++++++++++++--------
> arch/powerpc/kvm/book3s_pr.c | 17 +-------
books3s_pr.c can be a module, so we need giveup_all() to be EXPORT_SYMBOL.
I'll fix it up on my end.
cheers
next prev parent reply other threads:[~2015-12-02 8:24 UTC|newest]
Thread overview: 32+ 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 ` [01/19] " Michael Ellerman
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 [this message]
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
-- strict thread matches above, loose matches on Subject: below --
2015-10-28 0:50 [PATCH 01/19] powerpc: Don't disable kernel FP/VMX/VSX MSR bits on context switch Anton Blanchard
2015-10-28 0:51 ` [PATCH 16/19] powerpc: create giveup_all() Anton Blanchard
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