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Fri, 22 Aug 2025 03:51:22 -0700 (PDT) Received: from xiao.mioffice.cn ([43.224.245.230]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-325123e82dcsm2201750a91.3.2025.08.22.03.51.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 22 Aug 2025 03:51:21 -0700 (PDT) From: Xiang Gao To: rostedt@goodmis.org, mhiramat@kernel.org Cc: mathieu.desnoyers@efficios.com, andrii@kernel.org, mingo@kernel.org, oleg@redhat.com, akpm@linux-foundation.org, gmonaco@redhat.com, ricardo.neri-calderon@linux.intel.com, libo.chen@oracle.com, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, gaoxiang17 Subject: [PATCH] tracing/sched: add 'next_policy' to trace_sched_switch Date: Fri, 22 Aug 2025 18:51:13 +0800 Message-Id: <20250822105113.1102099-1-gxxa03070307@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: gaoxiang17 Sometimes, when analyzing some real-time process issues, it is necessary to= know the sched policy. Show up in the trace as: 113.457176: sched_switch: prev_comm=3Dkcompactd0 prev_pid=3D30 prev_p= rio=3D120 prev_state=3DS =3D=3D> next_comm=3Dkworker/u4:1 next_pid=3D27 nex= t_prio=3D120 next_policy=3D0 113.457282: sched_switch: prev_comm=3Dkworker/u4:1 prev_pid=3D27 prev= _prio=3D120 prev_state=3DI =3D=3D> next_comm=3Dswapper/0 next_pid=3D0 next_= prio=3D120 next_policy=3D0 113.461166: sched_switch: prev_comm=3Dswapper/0 prev_pid=3D0 prev_pri= o=3D120 prev_state=3DR =3D=3D> next_comm=3Dkworker/u4:1 next_pid=3D27 next_= prio=3D120 next_policy=3D0 Signed-off-by: gaoxiang17 --- include/trace/events/sched.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h index 7b2645b50e78..b416b7bafee4 100644 --- a/include/trace/events/sched.h +++ b/include/trace/events/sched.h @@ -234,6 +234,7 @@ TRACE_EVENT(sched_switch, __array( char, next_comm, TASK_COMM_LEN ) __field( pid_t, next_pid ) __field( int, next_prio ) + __field( unsigned int, next_policy ) ), =20 TP_fast_assign( @@ -244,10 +245,11 @@ TRACE_EVENT(sched_switch, memcpy(__entry->next_comm, next->comm, TASK_COMM_LEN); __entry->next_pid =3D next->pid; __entry->next_prio =3D next->prio; + __entry->next_policy =3D next->policy; /* XXX SCHED_DEADLINE */ ), =20 - TP_printk("prev_comm=3D%s prev_pid=3D%d prev_prio=3D%d prev_state=3D%s%s = =3D=3D> next_comm=3D%s next_pid=3D%d next_prio=3D%d", + TP_printk("prev_comm=3D%s prev_pid=3D%d prev_prio=3D%d prev_state=3D%s%s = =3D=3D> next_comm=3D%s next_pid=3D%d next_prio=3D%d next_policy=3D%u", __entry->prev_comm, __entry->prev_pid, __entry->prev_prio, =20 (__entry->prev_state & (TASK_REPORT_MAX - 1)) ? @@ -263,7 +265,7 @@ TRACE_EVENT(sched_switch, "R", =20 __entry->prev_state & TASK_REPORT_MAX ? "+" : "", - __entry->next_comm, __entry->next_pid, __entry->next_prio) + __entry->next_comm, __entry->next_pid, __entry->next_prio, __entry->next= _policy) ); =20 /* --=20 2.34.1