From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 53393C433EF for ; Thu, 21 Apr 2022 17:58:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1391097AbiDUSAv (ORCPT ); Thu, 21 Apr 2022 14:00:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55354 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1391035AbiDUSAs (ORCPT ); Thu, 21 Apr 2022 14:00:48 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 1D79146B14 for ; Thu, 21 Apr 2022 10:57:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1650563877; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=a4va1/Lq36cMvwBfvf9W3jL50NhUZUHTTW2j9bp+3cE=; b=dzzV8x3XrqO5l+YuRW0cr14vKlSDjgOso5bkbyEibynUAYGDtsrvvalfbUWF6wiCd5/F+N +TrXQU4Hq66AGHC8duoct6GodhtB0qw4tiNkBJo30y/GpegyeewSK03m85Nnq+gIx/YVa3 EfK8NRAetqOh/pZUrTEytEGgqRc8XgA= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-1-ryYKA82UMta93HSRiWfXaQ-1; Thu, 21 Apr 2022 13:57:51 -0400 X-MC-Unique: ryYKA82UMta93HSRiWfXaQ-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 1198F1014A64; Thu, 21 Apr 2022 17:57:51 +0000 (UTC) Received: from warthog.procyon.org.uk (unknown [10.33.36.13]) by smtp.corp.redhat.com (Postfix) with ESMTP id 9088240CFD22; Thu, 21 Apr 2022 17:57:43 +0000 (UTC) Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 From: David Howells In-Reply-To: <2067a5c7-4e24-f449-4676-811d12e9ab72@linux.alibaba.com> References: <2067a5c7-4e24-f449-4676-811d12e9ab72@linux.alibaba.com> <20220415123614.54024-3-jefflexu@linux.alibaba.com> <20220415123614.54024-1-jefflexu@linux.alibaba.com> <1447543.1650552898@warthog.procyon.org.uk> To: JeffleXu Cc: dhowells@redhat.com, linux-cachefs@redhat.com, xiang@kernel.org, chao@kernel.org, linux-erofs@lists.ozlabs.org, torvalds@linux-foundation.org, gregkh@linuxfoundation.org, willy@infradead.org, linux-fsdevel@vger.kernel.org, joseph.qi@linux.alibaba.com, bo.liu@linux.alibaba.com, tao.peng@linux.alibaba.com, gerry@linux.alibaba.com, eguan@linux.alibaba.com, linux-kernel@vger.kernel.org, luodaowen.backend@bytedance.com, tianzichen@kuaishou.com, fannaihao@baidu.com, zhangjiachen.jaycee@bytedance.com Subject: Re: EMFILE/ENFILE mitigation needed in erofs? MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <1484180.1650563860.1@warthog.procyon.org.uk> Date: Thu, 21 Apr 2022 18:57:40 +0100 Message-ID: <1484181.1650563860@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 2.84 on 10.11.54.1 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org JeffleXu wrote: > 2. Our user daemon will configure rlimit-nofile to a reasonably large > (e.g. 1 million) value, so that it won't fail when trying to allocate fds. There's a system-wide limit also; simply increasing the rlimit won't override that. David