From nobody Mon Feb 9 04:03:22 2026 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (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 E3E9625A63D; Wed, 30 Apr 2025 11:02:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746010976; cv=none; b=p780xqGmcxvotw+a+CtAaH36kRqm6lqeMQtuWI97dxBH8XRKQqGI8R63sIz8zkcl0IpdIKma3ev3/OW85yZBeBH6J1gVpOzuM4QJPkn2WKHizvA/8zblaKXAKOHP1L+KPQ2s/FQzL2Kj2wH1GqtmMBo8G3Q088qPjKGcVPjhePc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746010976; c=relaxed/simple; bh=hQA6qqGvwzZFtAZxFqekDTt+sSU6wgmodPxkSK4vBIs=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=r2cCQfJz+e1zILK3ltcdteHoNGjIR6z3nVMPb7zDcQQkpH8rYKNAoKyq8kdmRRzRJLg9Cfkwetg0edP2DM4DIeMQjqkCd43+CYevLKGyL6j1AcPO4f4LdqAARB2wkR27+ixbWKSzLicQTp71u5zoIBEhVYrYVRkAjU34Fp2EMLU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=f9AI9JOt; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=s0D0wsxY; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="f9AI9JOt"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="s0D0wsxY" From: Nam Cao DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1746010970; 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=US9+bEe6lsHn+NLLmdFqzC4dUUP/fmwKCds5E1h2XJ0=; b=f9AI9JOtMsRGJGoDF0caEPwGRRqDJ4fTw9EDX39DCFdKFM/NKlOvzpy+6oSiUXNiffxgcX +5CR+g4hPq07UsfIRxttC07DlZSZ6gfbwVIH5qWwRCAlolhinbOlpA78eda/QEz4KHZN18 5ZOrdcVt7cu5qzNImYYkCrdQ53RGZCTk0ylgbjCr8l+yStK+FTOKkK7O1Wmxp6aNG8hyqJ b01S1w+nckvzvedE348UjKSztThsujAjn5SL9F97oUkbTKU8vRVOoxR+uak3w5EvfhQwtg kckuYy7KKFFZwjnVaES53gEc5pxERkgH0B/xSyfwQmBZkXlkAg5cxXlEu4nCHw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1746010970; 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=US9+bEe6lsHn+NLLmdFqzC4dUUP/fmwKCds5E1h2XJ0=; b=s0D0wsxYOFQjUK7YTwcefKffdR3/S/EAkmAx1sLWc5Hw2ASFSElZlCPaOVA2vHYCfezuio 7VjeqTt8xzQcsvDA== To: Steven Rostedt , Gabriele Monaco , linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: john.ogness@linutronix.de, Nam Cao Subject: [PATCH v6 22/22] rv: Allow to configure the number of per-task monitor Date: Wed, 30 Apr 2025 13:02:37 +0200 Message-Id: <044759be658d4ec5fdb18246ac9ef07eccce9845.1745999587.git.namcao@linutronix.de> In-Reply-To: References: 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" Now that there are 2 monitors for real-time applications, users may want to enable both of them simultaneously. Make the number of per-task monitor configurable. Default it to 2 for now. Reviewed-by: Gabriele Monaco Signed-off-by: Nam Cao --- include/linux/rv.h | 9 +-------- include/linux/sched.h | 8 +++----- kernel/trace/rv/Kconfig | 9 +++++++++ kernel/trace/rv/monitors/rtapp/Kconfig | 1 + kernel/trace/rv/rv.c | 8 ++++---- 5 files changed, 18 insertions(+), 17 deletions(-) diff --git a/include/linux/rv.h b/include/linux/rv.h index 2897aad16883..099b23c14e54 100644 --- a/include/linux/rv.h +++ b/include/linux/rv.h @@ -74,14 +74,7 @@ struct ltl_monitor {}; =20 #endif /* CONFIG_RV_LTL_MONITOR */ =20 -/* - * Per-task RV monitors count. Nowadays fixed in RV_PER_TASK_MONITORS. - * If we find justification for more monitors, we can think about - * adding more or developing a dynamic method. So far, none of - * these are justified. - */ -#define RV_PER_TASK_MONITORS 1 -#define RV_PER_TASK_MONITOR_INIT (RV_PER_TASK_MONITORS) +#define RV_PER_TASK_MONITOR_INIT (CONFIG_RV_PER_TASK_MONITORS) =20 union rv_task_monitor { struct da_monitor da_mon; diff --git a/include/linux/sched.h b/include/linux/sched.h index 45be0fa7a5cc..560782493292 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1623,12 +1623,10 @@ struct task_struct { =20 #ifdef CONFIG_RV /* - * Per-task RV monitor. Nowadays fixed in RV_PER_TASK_MONITORS. - * If we find justification for more monitors, we can think - * about adding more or developing a dynamic method. So far, - * none of these are justified. + * Per-task RV monitor, fixed in CONFIG_RV_PER_TASK_MONITORS. + * If memory becomes a concern, we can think about a dynamic method. */ - union rv_task_monitor rv[RV_PER_TASK_MONITORS]; + union rv_task_monitor rv[CONFIG_RV_PER_TASK_MONITORS]; #endif =20 #ifdef CONFIG_USER_EVENTS diff --git a/kernel/trace/rv/Kconfig b/kernel/trace/rv/Kconfig index 942d57575e67..c11bf7e61ebf 100644 --- a/kernel/trace/rv/Kconfig +++ b/kernel/trace/rv/Kconfig @@ -32,6 +32,15 @@ menuconfig RV For further information, see: Documentation/trace/rv/runtime-verification.rst =20 +config RV_PER_TASK_MONITORS + int "Maximum number of per-task monitor" + depends on RV + range 1 8 + default 2 + help + This option configures the maximum number of per-task RV monitors that = can run + simultaneously. + source "kernel/trace/rv/monitors/wip/Kconfig" source "kernel/trace/rv/monitors/wwnr/Kconfig" source "kernel/trace/rv/monitors/sched/Kconfig" diff --git a/kernel/trace/rv/monitors/rtapp/Kconfig b/kernel/trace/rv/monit= ors/rtapp/Kconfig index 94689d66a79c..6a521c95a03f 100644 --- a/kernel/trace/rv/monitors/rtapp/Kconfig +++ b/kernel/trace/rv/monitors/rtapp/Kconfig @@ -1,5 +1,6 @@ config RV_MON_RTAPP depends on RV + depends on RV_PER_TASK_MONITORS >=3D 2 bool "rtapp monitor" help Collection of monitors to check for common problems with real-time appl= ication that cause diff --git a/kernel/trace/rv/rv.c b/kernel/trace/rv/rv.c index d493fddf411f..ebd4b4b228bf 100644 --- a/kernel/trace/rv/rv.c +++ b/kernel/trace/rv/rv.c @@ -165,7 +165,7 @@ struct dentry *get_monitors_root(void) LIST_HEAD(rv_monitors_list); =20 static int task_monitor_count; -static bool task_monitor_slots[RV_PER_TASK_MONITORS]; +static bool task_monitor_slots[CONFIG_RV_PER_TASK_MONITORS]; =20 int rv_get_task_monitor_slot(void) { @@ -173,12 +173,12 @@ int rv_get_task_monitor_slot(void) =20 lockdep_assert_held(&rv_interface_lock); =20 - if (task_monitor_count =3D=3D RV_PER_TASK_MONITORS) + if (task_monitor_count =3D=3D CONFIG_RV_PER_TASK_MONITORS) return -EBUSY; =20 task_monitor_count++; =20 - for (i =3D 0; i < RV_PER_TASK_MONITORS; i++) { + for (i =3D 0; i < CONFIG_RV_PER_TASK_MONITORS; i++) { if (task_monitor_slots[i] =3D=3D false) { task_monitor_slots[i] =3D true; return i; @@ -194,7 +194,7 @@ void rv_put_task_monitor_slot(int slot) { lockdep_assert_held(&rv_interface_lock); =20 - if (slot < 0 || slot >=3D RV_PER_TASK_MONITORS) { + if (slot < 0 || slot >=3D CONFIG_RV_PER_TASK_MONITORS) { WARN_ONCE(1, "RV releasing an invalid slot!: %d\n", slot); return; } --=20 2.39.5