From nobody Tue Feb 10 01:19:52 2026 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 368D4273FD for ; Tue, 4 Mar 2025 01:28:15 +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=1741051699; cv=none; b=Wv3D7NofyBndqr3ICQ61uXmAoOVqpb7d7hbognzz31BTN9StDlZNo7LbrhCV7rLwO8lMsLKGf916Exc8Xy4pMSmh3jxFVaL/n+9dLpG9oGqYl2u3YL5fdfGbzVIo0lSka3ytdR2vc4CfvuRXO3aKPFOy9WdBdgaQpSHX6UbwMEQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741051699; c=relaxed/simple; bh=wVKPu1/TDuVoF2kUDbsKuZcJYjeaeWVZ5Qj5ArOeupc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Qy8cP8ju58TLhjywpqmX0+xoFtOvAJUsyfF4uEKESv+CSzqqp5Enyz4GFkZ+rkY7D/a5U5etcuJJ674/FRNEmFruHD5yYSs+OTqgo6tN5KOrmu59lsJTUatHN1npwvlxx9qzI6khKy7LEYhRVGhyRs9XkrQxm81qeppK7pLsml0= 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=ZKQ4u0u8; 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="ZKQ4u0u8" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=igalia.com; s=20170329; h=Content-Transfer-Encoding:MIME-Version:References:In-Reply-To: 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:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=8HX/7PYovNGM5QD3NV52qDB+IT7TlNEfS8CekJi9+5Y=; b=ZKQ4u0u8MDolpvqK7ADx2gxpIx IsWV0DHLPcm6Xk4jnUI5FS7nP0sRUCIPrYpOzcOrwtnU9G3JPhyPqD74QkfHUxOGWU5J/gnZzYEQt Tfbdjs/fnUjVPAH/p+JCmT6CrutqTfq5ae1oFbj5914Y2RSc+x3MoO8j9fc/YEdq8Gs6lsjPFzX/v I6nMaFDRb+iZ025iJwljAfhS1wDci0s8EPrA/wQfes9i1jvGAuFJjU8K+7oogGTyiQdrLshl9U9sl q21MMpSwvuxwTvk63cLuBYlX3gaDPP26/xjz8R/kDiXNK8yfr2QMrcibNyRGxA5/9acbyyVRTbeCz RsDCgZrw==; 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 1tpH4k-003VPw-5J; Tue, 04 Mar 2025 02:28:08 +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 v3 2/2] sched_ext: Add trace point to track sched_ext core events Date: Tue, 4 Mar 2025 10:27:40 +0900 Message-ID: <20250304012740.35473-3-changwoo@igalia.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250304012740.35473-1-changwoo@igalia.com> References: <20250304012740.35473-1-changwoo@igalia.com> 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; s64 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 %lld", event_name, ctx->delta); return 0; } =3D=3D=3D=3D=3D=3D Signed-off-by: Changwoo Min --- 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..3d04b9819548 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( __s64, delta ) + ), + + TP_fast_assign( + __assign_str(name); + __entry->delta =3D delta; + ), + + TP_printk("name %s delta %lld", + __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 686629a860f3..debcd1cf2de9 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