From nobody Tue Dec 16 08:36:41 2025 Received: from fanzine2.igalia.com (fanzine.igalia.com [178.60.130.6]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D261E255E22 for ; Fri, 28 Feb 2025 09:00:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=178.60.130.6 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740733217; cv=none; b=SysON0NzCaVTf/pPZUVRZ0CeHJgsbfYuMvKGjj4IHn7kZCLZiAMcf4DngOSiiSpYvAWcrOiB7Az8kC+F2a0Zlj4Hk6dQ6DPe9nkO5mVhJzilcqAYUCdVOHD86djWSgt0B3BNuM5XDtXXSFMPh1ZOKW9QpU3uYDhhH8xOLhAQIo0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740733217; c=relaxed/simple; bh=mzc25wq3Csf/EZLN6ZLDiln49xQ+5s7zroBqJBuLEfc=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=RlNcxCo7rjYAHXnCDEgAUb7/O6RpVkGyTtjJXJXxHKuWerzQ+cQh0eo7oOR9uwtdBJX9fucYz1BLBhPEfAh+oFEblBW4J2xHvaBjwdAJcd87Y9rQD0KN33+QGvvMOrvWklellNAniOkCBGIdj8n5woudo4Z86di4KyyadPQfFNw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=igalia.com; spf=pass smtp.mailfrom=igalia.com; dkim=pass (2048-bit key) header.d=igalia.com header.i=@igalia.com header.b=UKq6HgbR; arc=none smtp.client-ip=178.60.130.6 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=igalia.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=igalia.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=igalia.com header.i=@igalia.com header.b="UKq6HgbR" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=igalia.com; s=20170329; h=Content-Transfer-Encoding:MIME-Version:Message-ID:Date:Subject: Cc:To:From:Sender:Reply-To:Content-Type:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: In-Reply-To:References:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=SOiQ8tn4AKnAdhAjLocySKLR0p2tLjQ2yrXrzUz5VHw=; b=UKq6HgbRovZZCQLRMyxtLC0X0r hwA1Ak+BkM6OcbaSZkpmbbz+onRwtF1hu3t3qbW2TxZMiX9fCy6uI5ajYY3U5pPoThXJhVQyHkTIc gX0S4hwoXWw0paRsRiJS43Qnnb4gDCPnolLAA9ODpCBNB70xidCJlezZDDEVxAn260iZENfu6eYFe F+2zpDnA1eF2O74IvGYp+RqXsM0z7rPZbP01S4/EuUazqnkeE9tUuKzEujFSrAMcG0ahB06UYgvID tmEkSX/UZtGjbLwbM90KC+V+hxPISUFrCzj2dRn8efX/nV4dI5xr0oDP89DD4iTxD+49X6DP5uOEy yNCs9eUg==; Received: from [58.29.143.236] (helo=localhost) by fanzine2.igalia.com with utf8esmtpsa (Cipher TLS1.3:ECDHE_SECP256R1__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim) id 1tnwDn-001xDd-OY; Fri, 28 Feb 2025 09:59:58 +0100 From: Changwoo Min To: tj@kernel.org, void@manifault.com, arighi@nvidia.com Cc: kernel-dev@igalia.com, linux-kernel@vger.kernel.org, Changwoo Min Subject: [PATCH v2] sched_ext: Add trace point to track sched_ext core events Date: Fri, 28 Feb 2025 17:59:44 +0900 Message-ID: <20250228085944.19451-1-changwoo@igalia.com> X-Mailer: git-send-email 2.48.1 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" Add tracing support to track sched_ext core events (/sched_ext/sched_ext_event). This may be useful for debugging sched_ext schedulers that trigger a particular event. The trace point can be used as other trace points, so it can be used in, for example, `perf trace` and BPF programs, as follows: =3D=3D=3D=3D=3D=3D $> sudo perf trace -e sched_ext:sched_ext_event --filter 'name =3D=3D "SCX_= EV_ENQ_SLICE_DFL"' =3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D struct tp_sched_ext_event { struct trace_entry ent; u32 __data_loc_name; u64 delta; }; SEC("tracepoint/sched_ext/sched_ext_event") int rtp_add_event(struct tp_sched_ext_event *ctx) { char event_name[128]; unsigned short offset =3D ctx->__data_loc_name & 0xFFFF; bpf_probe_read_str((void *)event_name, 128, (char *)ctx + offset); bpf_printk("name %s delta %llu", event_name, ctx->delta); return 0; } =3D=3D=3D=3D=3D=3D Signed-off-by: Changwoo Min --- ChangeLog v1 -> v2: - Rename @added field to @delta for clarity. - Rename sched_ext_add_event to sched_ext_event. - Drop the @offset field to avoid the potential misuse of non-portable num= bers. include/trace/events/sched_ext.h | 19 +++++++++++++++++++ kernel/sched/ext.c | 2 ++ 2 files changed, 21 insertions(+) diff --git a/include/trace/events/sched_ext.h b/include/trace/events/sched_= ext.h index fe19da7315a9..b73499981682 100644 --- a/include/trace/events/sched_ext.h +++ b/include/trace/events/sched_ext.h @@ -26,6 +26,25 @@ TRACE_EVENT(sched_ext_dump, ) ); =20 +TRACE_EVENT(sched_ext_event, + TP_PROTO(const char *name, __u64 delta), + TP_ARGS(name, delta), + + TP_STRUCT__entry( + __string(name, name) + __field( __u64, delta ) + ), + + TP_fast_assign( + __assign_str(name); + __entry->delta =3D delta; + ), + + TP_printk("name %s delta %llu", + __get_str(name), __entry->delta + ) +); + #endif /* _TRACE_SCHED_EXT_H */ =20 /* This part must be outside protection */ diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c index 986b655911df..53729c584b63 100644 --- a/kernel/sched/ext.c +++ b/kernel/sched/ext.c @@ -1554,6 +1554,7 @@ static DEFINE_PER_CPU(struct scx_event_stats, event_s= tats_cpu); */ #define scx_add_event(name, cnt) do { \ this_cpu_add(event_stats_cpu.name, cnt); \ + trace_sched_ext_event(#name, cnt); \ } while(0) =20 /** @@ -1565,6 +1566,7 @@ static DEFINE_PER_CPU(struct scx_event_stats, event_s= tats_cpu); */ #define __scx_add_event(name, cnt) do { \ __this_cpu_add(event_stats_cpu.name, cnt); \ + trace_sched_ext_event(#name, cnt); \ } while(0) =20 /** --=20 2.48.1