From mboxrd@z Thu Jan 1 00:00:00 1970 From: Valentin Schneider Subject: [RFC PATCH 2/5] sched, smp: Trace send_call_function_single_ipi() Date: Fri, 7 Oct 2022 16:45:30 +0100 Message-ID: <20221007154533.1878285-2-vschneid@redhat.com> References: <20221007154145.1877054-1-vschneid@redhat.com> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Return-path: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1665157558; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=jAXnJ0u7W03NIJPSLVmnFtjZEFHwdySA+neP8cndke0=; b=BlpE/KWA6vSfSEadFZCe4+saQXyb3DEbN7jph/d7hlBvFyupWKVQWV0rdbNHE1z3q2yim4 vmSLGkN6wmcBiSYQV5dGO9ljuzL5WjbTXHGKrF4lIYf7LIFe/TNSG9DwtF9DXHUlugjfU+ 8HO5rOIWljFre+956VBcqzT7fDquboU= In-Reply-To: <20221007154145.1877054-1-vschneid@redhat.com> List-ID: Content-Type: text/plain; charset="us-ascii" To: linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, 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-xtensa@linux-xtensa.org, x86@kernel.org Cc: "Paul E. McKenney" , Steven Rostedt , Peter Zijlstra , Thomas Gleixner , Sebastian Andrzej Siewior , Juri Lelli , Daniel Bristot de Oliveira , Marcelo Tosatti , Frederic Weisbecker , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Marc Zyngier , Mark Rutland , Russell King , Nicholas Piggin , Guo Ren , "David S. Miller" send_call_function_single_ipi() is the thing that sends IPIs at the bottom of smp_call_function*() via either generic_exec_single() or smp_call_function_many_cond(). Give it an IPI-related tracepoint. Note that this ends up tracing any IPI sent via __smp_call_single_queue(), which covers __ttwu_queue_wakelist() and irq_work_queue_on() "for free". Signed-off-by: Valentin Schneider --- arch/arm/kernel/smp.c | 3 --- arch/arm64/kernel/smp.c | 1 - kernel/sched/core.c | 7 +++++-- kernel/smp.c | 4 ++++ 4 files changed, 9 insertions(+), 6 deletions(-) diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index 978db2d96b44..3b280d55c1c4 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -48,9 +48,6 @@ #include #include -#define CREATE_TRACE_POINTS -#include - /* * as from 2.5, kernels no longer have an init_tasks structure * so we need some other way of telling a new secondary core diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index ffc5d76cf695..937d2623e06b 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -51,7 +51,6 @@ #include #include -#define CREATE_TRACE_POINTS #include DEFINE_PER_CPU_READ_MOSTLY(int, cpu_number); diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 60fdc0faf1c9..14e5e137172f 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -81,6 +81,7 @@ #include #include #undef CREATE_TRACE_POINTS +#include #include "sched.h" #include "stats.h" @@ -3753,10 +3754,12 @@ void send_call_function_single_ipi(int cpu) { struct rq *rq = cpu_rq(cpu); - if (!set_nr_if_polling(rq->idle)) + if (!set_nr_if_polling(rq->idle)) { + trace_ipi_send_cpu(_RET_IP_, cpu); arch_send_call_function_single_ipi(cpu); - else + } else { trace_sched_wake_idle_without_ipi(cpu); + } } /* diff --git a/kernel/smp.c b/kernel/smp.c index e8cdc025a046..7a7a22d69972 100644 --- a/kernel/smp.c +++ b/kernel/smp.c @@ -26,6 +26,10 @@ #include #include +#define CREATE_TRACE_POINTS +#include +#undef CREATE_TRACE_POINTS + #include "smpboot.h" #include "sched/smp.h" -- 2.31.1