linux-kernel - Re: Re: [PATCH] perf/x86/intel/bts: allocate bts

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Message-ID: <6d59c9067b7e4711a1ea7236d639a3c2@baidu.com>
Date: Wed, 30 Oct 2024 07:50:20 +0000
From: "Li,Rongqing" <lirongqing@...du.com>
To: Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	"peterz@...radead.org" <peterz@...radead.org>, "mingo@...hat.com"
	<mingo@...hat.com>, "acme@...nel.org" <acme@...nel.org>,
	"namhyung@...nel.org" <namhyung@...nel.org>, "mark.rutland@....com"
	<mark.rutland@....com>, "jolsa@...nel.org" <jolsa@...nel.org>,
	"irogers@...gle.com" <irogers@...gle.com>, "adrian.hunter@...el.com"
	<adrian.hunter@...el.com>, "kan.liang@...ux.intel.com"
	<kan.liang@...ux.intel.com>, "tglx@...utronix.de" <tglx@...utronix.de>,
	"bp@...en8.de" <bp@...en8.de>, "dave.hansen@...ux.intel.com"
	<dave.hansen@...ux.intel.com>, "x86@...nel.org" <x86@...nel.org>,
	"hpa@...or.com" <hpa@...or.com>, "linux-perf-users@...r.kernel.org"
	<linux-perf-users@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "zhiquan1.li@...el.com"
	<zhiquan1.li@...el.com>
Subject: Re: Re: [PATCH] perf/x86/intel/bts: allocate bts_ctx only if
 necessary

> > Avoid unnecessary per-CPU memory allocation on unsupported CPUs, this
> > can save 12K memory for every CPU
> 
> Looks reasonable, but have you tested it? This driver is in serious danger of
> bitrot ever since KPTI. It might save even more if we simply remove the whole
> thing.
> 

I fine to remove it, Could you send a patch to remove it

Thank

-Li