linux-kernel - Re: [PATCH v2 00/10] perf: Avoid placing cpumask var on stack

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Date: Wed, 3 Apr 2024 15:41:07 +0100
From: Mark Rutland <mark.rutland@....com>
To: Dawei Li <dawei.li@...ngroup.cn>
Cc: will@...nel.org, yury.norov@...il.com, linux@...musvillemoes.dk,
	xueshuai@...ux.alibaba.com, renyu.zj@...ux.alibaba.com,
	yangyicong@...ilicon.com, jonathan.cameron@...wei.com,
	andersson@...nel.org, konrad.dybcio@...aro.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v2 00/10] perf: Avoid placing cpumask var on stack

On Wed, Apr 03, 2024 at 08:50:59PM +0800, Dawei Li wrote:
> Hi all,

Hi,

> This is v2 of [1] and [2] which basically eliminate cpumask var allocation
> on stack for perf subsystem.
> 
> Change since v1:
> - Change from dynamic allocation to a temporary var free helper:
>   cpumask_any_and_but().	[Mark]
> 
> - Some minor coding style improvements, reverse chrismas tree e.g.
> 
> - For cpumask_any_and_but() itself:
>   - Moved to cpumask.h, just like other helpers.
>   - Return value converted to unsigned int.
>   - Remove EXPORT_SYMBOL, for obvious reason.

Thanks for this!

The logic all looks good; if you can spin a v3 with the updated commit messages
I reckon we can queue this up shortly.

Mark.

> 
> [1]:
> https://lore.kernel.org/lkml/20240402105610.1695644-1-dawei.li@shingroup.cn/
> 
> [2]:
> https://lore.kernel.org/lkml/1486381132-5610-1-git-send-email-mark.rutland@arm.com/
> 
> Dawei Li (9):
>   perf/alibaba_uncore_drw: Avoid placing cpumask var on stack
>   perf/arm-cmn: Avoid placing cpumask var on stack
>   perf/arm_cspmu: Avoid placing cpumask var on stack
>   perf/arm_dsu: Avoid placing cpumask var on stack
>   perf/dwc_pcie: Avoid placing cpumask var on stack
>   perf/hisi_pcie: Avoid placing cpumask var on stack
>   perf/hisi_uncore: Avoid placing cpumask var on stack
>   perf/qcom_l2: Avoid placing cpumask var on stack
>   perf/thunderx2: Avoid placing cpumask var on stack
> 
> Mark Rutland (1):
>   cpumask: add cpumask_any_and_but()
> 
>  drivers/perf/alibaba_uncore_drw_pmu.c    | 10 +++-------
>  drivers/perf/arm-cmn.c                   | 10 +++++-----
>  drivers/perf/arm_cspmu/arm_cspmu.c       |  8 +++-----
>  drivers/perf/arm_dsu_pmu.c               | 19 ++++++-------------
>  drivers/perf/dwc_pcie_pmu.c              | 10 ++++------
>  drivers/perf/hisilicon/hisi_pcie_pmu.c   |  9 ++++-----
>  drivers/perf/hisilicon/hisi_uncore_pmu.c |  6 ++----
>  drivers/perf/qcom_l2_pmu.c               |  8 +++-----
>  drivers/perf/thunderx2_pmu.c             | 10 +++-------
>  include/linux/cpumask.h                  | 23 +++++++++++++++++++++++
>  10 files changed, 56 insertions(+), 57 deletions(-)
> 
> Thanks,
> 
>     Dawei
> 
> -- 
> 2.27.0
>