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dfw.source.kernel.org (Postfix) with ESMTPS id 7BE61611AF; Tue, 17 Jan 2023 04:25:11 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B0701C433EF; Tue, 17 Jan 2023 04:24:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1673929510; bh=LKPfAbcdavLMCpifQk05Aqw+1tD2xg5qsuB6VorVVnI=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=rvDfVQk7Tsas4+LZFK04iCV/SqfYXmqYXLFi42JOngYW1dOP0QSo6CLiBkpjYosKx nKUcD4fx6Lu1RT5hJ5yblHd47Jqpvv59kmEAKtriWUWkTZ7hmC4Za3q3BgpEtr891G Uhe5azCk4FahsTTDCEc3lE2+MzsUQWKU5CAcTO6IYBsGKCz8NivYw+lk7qeBhykDxt x23XNA0A5LxituWhIHyg6sCe7NTSUKsY2ON6C3g6I/nFT8i/VEH7jmIvKLWoo8AYZN JlOlRfIFLAGKs5+FVWy9q/WwqqbuzK/Mvbqfsgyxm4gYqDdXx2B1Vx+ckQBMj8vEfk ICBnmkeUNpdwg== Date: Tue, 17 Jan 2023 13:24:46 +0900 From: Masami Hiramatsu (Google) To: Peter Zijlstra Cc: richard.henderson@linaro.org, ink@jurassic.park.msu.ru, mattst88@gmail.com, vgupta@kernel.org, linux@armlinux.org.uk, nsekhar@ti.com, brgl@bgdev.pl, ulli.kroll@googlemail.com, linus.walleij@linaro.org, shawnguo@kernel.org, Sascha Hauer , kernel@pengutronix.de, festevam@gmail.com, linux-imx@nxp.com, tony@atomide.com, khilman@kernel.org, krzysztof.kozlowski@linaro.org, alim.akhtar@samsung.com, catalin.marinas@arm.com, will@kernel.org, guoren@kernel.org, bcain@quicinc.com, chenhuacai@kernel.org, kernel@xen0n.name, geert@linux-m68k.org, sammy@sammy.net, monstr@monstr.eu, tsbogend@alpha.franken.de, dinguyen@kernel.org, jonas@southpole.se, stefan.kristiansson@saunalahti.fi, shorne@gmail.com, James.Bottomley@HansenPartnership.com, deller@gmx.de, mpe@ellerman.id.au, npiggin@gmail.com, christophe.leroy@csgroup.eu, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com, borntraeger@linux.ibm.com, svens@linux.ibm.com, ysato@users.sourceforge.jp, dalias@libc.org, davem@davemloft.net, richard@nod.at, anton.ivanov@cambridgegreys.com, johannes@sipsolutions.net, 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pmladek@suse.com, senozhatsky@chromium.org, john.ogness@linutronix.de, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, bsegall@google.com, mgorman@suse.de, bristot@redhat.com, vschneid@redhat.com, ryabinin.a.a@gmail.com, glider@google.com, andreyknvl@gmail.com, dvyukov@google.com, vincenzo.frascino@arm.com, Andrew Morton , jpoimboe@kernel.org, linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-omap@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-perf-users@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-xtensa@linux-xtensa.org, linux-acpi@vger.kernel.org, linux-pm@vger.kernel.org, linux-clk@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-tegra@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, kasan-dev@googlegroups.com Subject: Re: [PATCH v3 35/51] trace,hardirq: No moar _rcuidle() tracing Message-Id: <20230117132446.02ec12e4c10718de27790900@kernel.org> In-Reply-To: <20230112195541.477416709@infradead.org> References: <20230112194314.845371875@infradead.org> <20230112195541.477416709@infradead.org> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Stat-Signature: 3posqq9qxhew4m1zwqo1g97qbrwjf1cd X-Rspam-User: X-Rspamd-Queue-Id: EA9A6180015 X-Rspamd-Server: rspam06 X-HE-Tag: 1673929512-612880 X-HE-Meta: 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 7F79xOkp hK6KJFFFeKTr2bwetjfq196KL48vPmZWDhOc8lzwcqDNRBx/Vp6Y1EaaadAbGS2ot+IEFckdxPJLLDnb5oc938fDFuwWvKvM9UFYJy7iQ9fJNI21FK5ghrKCGPFaao58uK6XLQphiqVYYXCD4959JIVeI1S2KEy/keFyBfgJ8/GjavAyeIkG6KcLqhW+I2zZgtdeo8oLvgno0IQRu4qAA3oPevlIQ9aHsE5qQDkHvtej61aQz/wZOO6Dpv2urQ3kWI+T2UXLtE0BitkQcTpvUAMY1JtSEGa9U= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Hi Peter, On Thu, 12 Jan 2023 20:43:49 +0100 Peter Zijlstra wrote: > Robot reported that trace_hardirqs_{on,off}() tickle the forbidden > _rcuidle() tracepoint through local_irq_{en,dis}able(). > > For 'sane' configs, these calls will only happen with RCU enabled and > as such can use the regular tracepoint. This also means it's possible > to trace them from NMI context again. > > Signed-off-by: Peter Zijlstra (Intel) The code looks good to me. I just have a question about comment. > --- > kernel/trace/trace_preemptirq.c | 21 +++++++++++++-------- > 1 file changed, 13 insertions(+), 8 deletions(-) > > --- a/kernel/trace/trace_preemptirq.c > +++ b/kernel/trace/trace_preemptirq.c > @@ -20,6 +20,15 @@ > static DEFINE_PER_CPU(int, tracing_irq_cpu); > > /* > + * ... Is this intended? Wouldn't you leave any comment here? Thank you, > + */ > +#ifdef CONFIG_ARCH_WANTS_NO_INSTR > +#define trace(point) trace_##point > +#else > +#define trace(point) if (!in_nmi()) trace_##point##_rcuidle > +#endif > + > +/* > * Like trace_hardirqs_on() but without the lockdep invocation. This is > * used in the low level entry code where the ordering vs. RCU is important > * and lockdep uses a staged approach which splits the lockdep hardirq > @@ -28,8 +37,7 @@ static DEFINE_PER_CPU(int, tracing_irq_c > void trace_hardirqs_on_prepare(void) > { > if (this_cpu_read(tracing_irq_cpu)) { > - if (!in_nmi()) > - trace_irq_enable(CALLER_ADDR0, CALLER_ADDR1); > + trace(irq_enable)(CALLER_ADDR0, CALLER_ADDR1); > tracer_hardirqs_on(CALLER_ADDR0, CALLER_ADDR1); > this_cpu_write(tracing_irq_cpu, 0); > } > @@ -40,8 +48,7 @@ NOKPROBE_SYMBOL(trace_hardirqs_on_prepar > void trace_hardirqs_on(void) > { > if (this_cpu_read(tracing_irq_cpu)) { > - if (!in_nmi()) > - trace_irq_enable_rcuidle(CALLER_ADDR0, CALLER_ADDR1); > + trace(irq_enable)(CALLER_ADDR0, CALLER_ADDR1); > tracer_hardirqs_on(CALLER_ADDR0, CALLER_ADDR1); > this_cpu_write(tracing_irq_cpu, 0); > } > @@ -63,8 +70,7 @@ void trace_hardirqs_off_finish(void) > if (!this_cpu_read(tracing_irq_cpu)) { > this_cpu_write(tracing_irq_cpu, 1); > tracer_hardirqs_off(CALLER_ADDR0, CALLER_ADDR1); > - if (!in_nmi()) > - trace_irq_disable(CALLER_ADDR0, CALLER_ADDR1); > + trace(irq_disable)(CALLER_ADDR0, CALLER_ADDR1); > } > > } > @@ -78,8 +84,7 @@ void trace_hardirqs_off(void) > if (!this_cpu_read(tracing_irq_cpu)) { > this_cpu_write(tracing_irq_cpu, 1); > tracer_hardirqs_off(CALLER_ADDR0, CALLER_ADDR1); > - if (!in_nmi()) > - trace_irq_disable_rcuidle(CALLER_ADDR0, CALLER_ADDR1); > + trace(irq_disable)(CALLER_ADDR0, CALLER_ADDR1); > } > } > EXPORT_SYMBOL(trace_hardirqs_off); > > -- Masami Hiramatsu (Google)