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Date: Wed, 7 Sep 2022 14:28:59 +0800 From: haoxin <xhao@...ux.alibaba.com> To: James Morse <james.morse@....com>, x86@...nel.org, linux-kernel@...r.kernel.org Cc: Fenghua Yu <fenghua.yu@...el.com>, Reinette Chatre <reinette.chatre@...el.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, H Peter Anvin <hpa@...or.com>, Babu Moger <Babu.Moger@....com>, shameerali.kolothum.thodi@...wei.com, D Scott Phillips OS <scott@...amperecomputing.com>, lcherian@...vell.com, bobo.shaobowang@...wei.com, tan.shaopeng@...itsu.com, Jamie Iles <quic_jiles@...cinc.com>, Cristian Marussi <cristian.marussi@....com>, xingxin.hx@...nanolis.org, baolin.wang@...ux.alibaba.com, xhao@...ux.alibaba.com Subject: Re: [PATCH v6 04/21] x86/resctrl: Group struct rdt_hw_domain cleanup 在 2022/9/2 下午11:48, James Morse 写道: > domain_add_cpu() and domain_remove_cpu() need to kfree() the child > arrays that were allocated by domain_setup_ctrlval(). > > As this memory is moved around, and new arrays are created, adjusting > the error handling cleanup code becomes noisier. > > To simplify this, move all the kfree() calls into a domain_free() helper. > This depends on struct rdt_hw_domain being kzalloc()d, allowing it to > unconditionally kfree() all the child arrays. > > Reviewed-by: Jamie Iles <quic_jiles@...cinc.com> > Tested-by: Xin Hao <xhao@...ux.alibaba.com> > Reviewed-by: Shaopeng Tan <tan.shaopeng@...itsu.com> > Tested-by: Shaopeng Tan <tan.shaopeng@...itsu.com> > Tested-by: Cristian Marussi <cristian.marussi@....com> > Reviewed-by: Reinette Chatre <reinette.chatre@...el.com> > Signed-off-by: James Morse <james.morse@....com> > --- > Changes since v2: > * Made domain_free() static. > > Changes since v1: > * This patch is new > --- > arch/x86/kernel/cpu/resctrl/core.c | 17 ++++++++++------- > 1 file changed, 10 insertions(+), 7 deletions(-) > > diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c > index 25f30148478b..e37889f7a1a5 100644 > --- a/arch/x86/kernel/cpu/resctrl/core.c > +++ b/arch/x86/kernel/cpu/resctrl/core.c > @@ -414,6 +414,13 @@ void setup_default_ctrlval(struct rdt_resource *r, u32 *dc, u32 *dm) > } > } > > +static void domain_free(struct rdt_hw_domain *hw_dom) add inline ? > +{ > + kfree(hw_dom->ctrl_val); > + kfree(hw_dom->mbps_val); > + kfree(hw_dom); > +} > + > static int domain_setup_ctrlval(struct rdt_resource *r, struct rdt_domain *d) > { > struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r); > @@ -488,7 +495,7 @@ static void domain_add_cpu(int cpu, struct rdt_resource *r) > rdt_domain_reconfigure_cdp(r); > > if (r->alloc_capable && domain_setup_ctrlval(r, d)) { > - kfree(hw_dom); > + domain_free(hw_dom); > return; > } > > @@ -497,9 +504,7 @@ static void domain_add_cpu(int cpu, struct rdt_resource *r) > err = resctrl_online_domain(r, d); > if (err) { > list_del(&d->list); > - kfree(hw_dom->ctrl_val); > - kfree(hw_dom->mbps_val); > - kfree(hw_dom); > + domain_free(hw_dom); > } > } > > @@ -547,12 +552,10 @@ static void domain_remove_cpu(int cpu, struct rdt_resource *r) > if (d->plr) > d->plr->d = NULL; > > - kfree(hw_dom->ctrl_val); > - kfree(hw_dom->mbps_val); > bitmap_free(d->rmid_busy_llc); > kfree(d->mbm_total); > kfree(d->mbm_local); > - kfree(hw_dom); > + domain_free(hw_dom); > return; > } >
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