From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 BCC8A44DB69; Thu, 7 May 2026 16:51:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778172679; cv=none; b=tmPurXc6lFcp4TfUlllEctINRUIZ693g6SvSAT4MN6rWgDCmrJXYZu3h442MsFytDHkNfCYBYDfrnukUqmpylCmxctBSC0/1Kj2KxO53v237fN+DJb5Fuczk9e/x3gJpr73VlfeNd4yzMUsT3qq3gny9LOmKYy48jAu1UJuly7c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778172679; c=relaxed/simple; bh=QIsa2Ppg+z+bISJFMsl94LIGmvzARp866G06o2jW2hg=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=O5pDgyEoQmSer9Hjm7FJUEIX5aTAQtWGiy2ewp+BpdXJB1DcqNZ2eHkcKlBiReSSyz306JWCe/zc7iBhXHVqjm8P4ZbcWvu/drIjmCOHWUoZr0dBZOIjPASft65PTsY8jch9DDcq4WEynwe6ETEQ+ZZlRzWSjK3ziv/MtuLTnk8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=HHr2nqoP; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="HHr2nqoP" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8D1D1C2BCB2; Thu, 7 May 2026 16:51:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1778172679; bh=QIsa2Ppg+z+bISJFMsl94LIGmvzARp866G06o2jW2hg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HHr2nqoPkZBVyhSyBJOIaN2A+RLKvFoiVwgyfY9fZesMYoWHqEJCwlSZ30Vo4nuoH Q+9MLKxV/6Lb4Iu2MtXhqurkUOjFllk3kPtTF6jo3ramWzvZGSma7nrKw+WSoc+xG5 mLJn6Qo7+hiAiPxsmEqpPj3eVvo8LKLo26jar2DX84MVKcElJLcqH4li/pneygzknJ WFMXqDhNAjtGdy75uXAsv5IhYfDwGchAiNRSG4q17fUw/r4XMEqETJWyOb+gRqlj/e 5qvpO+PetGG85CdpcMGAcIKV2m/YntDrAoDTP8R1mY62qfBDH1PVIGxANH2bzAyQZ+ 4+OiTk4SEjBCA== Received: by paulmck-ThinkPad-P17-Gen-1.home (Postfix, from userid 1000) id 40C46CE0863; Thu, 7 May 2026 09:51:19 -0700 (PDT) From: "Paul E. McKenney" To: rcu@vger.kernel.org Cc: linux-kernel@vger.kernel.org, kernel-team@meta.com, rostedt@goodmis.org, Mathieu Desnoyers , "Paul E. McKenney" Subject: [PATCH RFC 4/4] hazptrtorture: Enable system-independent CPU overcommit Date: Thu, 7 May 2026 09:51:13 -0700 Message-Id: <20260507165113.2039524-4-paulmck@kernel.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <5bfe6ac9-432e-43b8-8290-59ca249b0f80@paulmck-laptop> References: <5bfe6ac9-432e-43b8-8290-59ca249b0f80@paulmck-laptop> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This commit interprets negative values of the nreaders module parameter as a number of readers per CPU, so that hazptrtorture.nreaders=-5 would spawn five hazard-pointer reader kthreads per CPU. Signed-off-by: Paul E. McKenney --- kernel/rcu/hazptrtorture.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/rcu/hazptrtorture.c b/kernel/rcu/hazptrtorture.c index 219fd90a7f8840..c266d0b64dfde1 100644 --- a/kernel/rcu/hazptrtorture.c +++ b/kernel/rcu/hazptrtorture.c @@ -631,7 +631,7 @@ static int __init hazptr_torture_init(void) if (nreaders >= 0) { nrealreaders = nreaders; } else { - nrealreaders = num_online_cpus() - 2 - nreaders; + nrealreaders = num_online_cpus() * -nreaders; if (nrealreaders <= 0) nrealreaders = 1; } -- 2.40.1