From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (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 BA78B38F232; Sat, 16 May 2026 23:09:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778972972; cv=none; b=Oj6fPIaQDEMcgDw+4abcS65HDcb36xE0JQIlqsi69vi6vyZ6+tYLUlwkJoGGW9auctUgG3Hjr/RFB/Lat9hlHU8e8WjMEc7IS9DTuPSNgzRngS+MQoPdCERyj+/DIv0WXV9Mlc4ydGTBWBRWW4WGH4Ry61UYl0HUWkuqsNfk5v8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778972972; c=relaxed/simple; bh=4jy1+XI1Xl9EQs40qzW8fgGrbGAr43OlIdo+VEffCkI=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=gPbQX1t39EUoSDIpCXi9kGENcLLulUNTQiIJLze/J4NW2hb9ZXcUxA798Gm1Wns9cVpU1kVTzB4teQ+SFLvZTNRrWIGd81Z1GE4xrYdgB0KvaR4YVF63a53JsHnrEmc1qcMqtpubfGTMHnns6bLJkEwkUwWau8Hk9TDuPuH4uZw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=qJYlFVYp; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="qJYlFVYp" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=4jy1+XI1Xl9EQs40qzW8fgGrbGAr43OlIdo+VEffCkI=; b=qJYlFVYpglchFIrSnRcodJBOnv kvXo+zmb1h5cWEpvTEC8YHj6eg8s+BPD+StFgiWY2dxgKA3rgFZ0AQxTyjMZ+x5J4lCOelgaY/sPc qWUw3qufNgioD5p+Z2V8dfs7S99j5+q1oJolJS/ZXLaVla/2pJHdiGMr/tuaj8ic66mt+i2I8utFE 6HomLafQlniTEkaTfJLzSIfU2MgsrWKmeAoEvMUxMzToLtd9Gx8XC5s32J2DfiMkozHpG3Am//3W5 RQRLeZLb7l+sjnx9v/kMqzzOqIACg7tEzUbib0c8TaU/releZPvDiDFyC7r8XfIv5RnpFInJZ2jwe uGdvdw5w==; Received: from willy by casper.infradead.org with local (Exim 4.99.1 #2 (Red Hat Linux)) id 1wOO8M-00000003KdM-1WQ7; Sat, 16 May 2026 23:09:26 +0000 Date: Sun, 17 May 2026 00:09:26 +0100 From: Matthew Wilcox To: Horst Birthelmer Cc: Miklos Szeredi , Jonathan Corbet , Shuah Khan , Alexander Viro , Christian Brauner , Jan Kara , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, Horst Birthelmer Subject: Re: [PATCH v2] dcache: add fs.dentry-limit sysctl with negative-first reaper Message-ID: References: <20260516-limit-dentries-cache-v2-1-c733a78e603b@ddn.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260516-limit-dentries-cache-v2-1-c733a78e603b@ddn.com> On Sat, May 16, 2026 at 04:52:54PM +0200, Horst Birthelmer wrote: > There was a discussion at LSFMM about servers with too many cached > negative dentries. > That gave me the idea to keep the dentries in general limited > if the system administrator needs it to. I feel you should link to the dozens of previous attempts at this kind of thing to show that you're aware that this has been tried before and you're doing something meaningfully different.