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 X-Spam-Level: X-Spam-Status: No, score=-5.0 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B8F36C433E0 for ; Thu, 28 Jan 2021 04:32:36 +0000 (UTC) Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 1E06764DD6 for ; Thu, 28 Jan 2021 04:32:35 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1E06764DD6 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=virtualization-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by hemlock.osuosl.org (Postfix) with ESMTP id 927588738A; Thu, 28 Jan 2021 04:32:35 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from hemlock.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id u6GhubN0mU2k; Thu, 28 Jan 2021 04:32:35 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by hemlock.osuosl.org (Postfix) with ESMTP id ED8C487083; Thu, 28 Jan 2021 04:32:34 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id CF259C08A1; Thu, 28 Jan 2021 04:32:34 +0000 (UTC) Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) by lists.linuxfoundation.org (Postfix) with ESMTP id 44E03C013A for ; Thu, 28 Jan 2021 04:32:33 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by hemlock.osuosl.org (Postfix) with ESMTP id 2ABE2871B6 for ; Thu, 28 Jan 2021 04:32:33 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from hemlock.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id YW46w5snJedQ for ; Thu, 28 Jan 2021 04:32:32 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [216.205.24.124]) by hemlock.osuosl.org (Postfix) with ESMTPS id 5E3DB87083 for ; Thu, 28 Jan 2021 04:32:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1611808351; 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: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=9NCZe85xmzeU0w+bJ6oE1HvmZ9MVGIS2YzFczMlWDrw=; b=WAC41jwmC2myLndYPuxjkVt8/3ykJmBrfX4xSuXxsqMpmrMPmrcCHiYR5DfJxWHkqWz2au YkYiUXC/pAWiUS6Uj2Vt3oHggPFY6Dol8rty972p/BepOSW9GOq84ZK0luo7JisGCq30d6 fBxeM9eKJn/UoYkyqe1jLLBRmNr9SlQ= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-16-rl1Hd8ASP-Cc1ju6c1ceNg-1; Wed, 27 Jan 2021 23:31:20 -0500 X-MC-Unique: rl1Hd8ASP-Cc1ju6c1ceNg-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 8D323801FCC; Thu, 28 Jan 2021 04:31:18 +0000 (UTC) Received: from [10.72.12.167] (ovpn-12-167.pek2.redhat.com [10.72.12.167]) by smtp.corp.redhat.com (Postfix) with ESMTP id 6A1685C1BB; Thu, 28 Jan 2021 04:31:03 +0000 (UTC) Subject: Re: [RFC v3 01/11] eventfd: track eventfd_signal() recursion depth separately in different cases To: Yongji Xie References: <20210119045920.447-1-xieyongji@bytedance.com> <20210119045920.447-2-xieyongji@bytedance.com> <6a5f0186-c2e3-4603-9826-50d5c68a3fda@redhat.com> From: Jason Wang Message-ID: <9226c594-e045-544d-4e46-c4c3c9c573a9@redhat.com> Date: Thu, 28 Jan 2021 12:31:01 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Cc: axboe@kernel.dk, Jonathan Corbet , kvm@vger.kernel.org, "Michael S. Tsirkin" , linux-aio@kvack.org, netdev@vger.kernel.org, Randy Dunlap , Matthew Wilcox , virtualization@lists.linux-foundation.org, Christoph Hellwig , Bob Liu , bcrl@kvack.org, viro@zeniv.linux.org.uk, Stefan Hajnoczi , linux-fsdevel@vger.kernel.org X-BeenThere: virtualization@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux virtualization List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" Ck9uIDIwMjEvMS8yOCDkuIrljYgxMTo1MiwgWW9uZ2ppIFhpZSB3cm90ZToKPiBPbiBUaHUsIEph biAyOCwgMjAyMSBhdCAxMTowNSBBTSBKYXNvbiBXYW5nIDxqYXNvd2FuZ0ByZWRoYXQuY29tPiB3 cm90ZToKPj4KPj4gT24gMjAyMS8xLzI3IOS4i+WNiDU6MTEsIFlvbmdqaSBYaWUgd3JvdGU6Cj4+ PiBPbiBXZWQsIEphbiAyNywgMjAyMSBhdCAxMTozOCBBTSBKYXNvbiBXYW5nIDxqYXNvd2FuZ0By ZWRoYXQuY29tPiB3cm90ZToKPj4+PiBPbiAyMDIxLzEvMjAg5LiL5Y2IMjo1MiwgWW9uZ2ppIFhp ZSB3cm90ZToKPj4+Pj4gT24gV2VkLCBKYW4gMjAsIDIwMjEgYXQgMTI6MjQgUE0gSmFzb24gV2Fu ZyA8amFzb3dhbmdAcmVkaGF0LmNvbT4gd3JvdGU6Cj4+Pj4+PiBPbiAyMDIxLzEvMTkg5LiL5Y2I MTI6NTksIFhpZSBZb25namkgd3JvdGU6Cj4+Pj4+Pj4gTm93IHdlIGhhdmUgYSBnbG9iYWwgcGVy Y3B1IGNvdW50ZXIgdG8gbGltaXQgdGhlIHJlY3Vyc2lvbiBkZXB0aAo+Pj4+Pj4+IG9mIGV2ZW50 ZmRfc2lnbmFsKCkuIFRoaXMgY2FuIGF2b2lkIGRlYWRsb2NrIG9yIHN0YWNrIG92ZXJmbG93Lgo+ Pj4+Pj4+IEJ1dCBpbiBzdGFjayBvdmVyZmxvdyBjYXNlLCBpdCBzaG91bGQgYmUgT0sgdG8gaW5j cmVhc2UgdGhlCj4+Pj4+Pj4gcmVjdXJzaW9uIGRlcHRoIGlmIG5lZWRlZC4gU28gd2UgYWRkIGEg cGVyY3B1IGNvdW50ZXIgaW4gZXZlbnRmZF9jdHgKPj4+Pj4+PiB0byBsaW1pdCB0aGUgcmVjdXJz aW9uIGRlcHRoIGZvciBkZWFkbG9jayBjYXNlLiBUaGVuIGl0IGNvdWxkIGJlCj4+Pj4+Pj4gZmlu ZSB0byBpbmNyZWFzZSB0aGUgZ2xvYmFsIHBlcmNwdSBjb3VudGVyIGxhdGVyLgo+Pj4+Pj4gSSB3 b25kZXIgd2hldGhlciBvciBub3QgaXQncyB3b3J0aCB0byBpbnRyb2R1Y2UgcGVyY3B1IGZvciBl YWNoIGV2ZW50ZmQuCj4+Pj4+Pgo+Pj4+Pj4gSG93IGFib3V0IHNpbXBseSBjaGVjayBpZiBldmVu dGZkX3NpZ25hbF9jb3VudCgpIGlzIGdyZWF0ZXIgdGhhbiAyPwo+Pj4+Pj4KPj4+Pj4gSXQgY2Fu J3QgYXZvaWQgZGVhZGxvY2sgaW4gdGhpcyB3YXkuCj4+Pj4gSSBtYXkgbWlzcyBzb21ldGhpbmcg YnV0IHRoZSBjb3VudCBpcyB0byBhdm9pZCByZWN1cnNpdmUgZXZlbnRmZCBjYWxsLgo+Pj4+IFNv IGZvciBWRFVTRSB3aGF0IHdlIHN1ZmZlcnMgaXMgZS5nIHRoZSBpbnRlcnJ1cHQgaW5qZWN0aW9u IHBhdGg6Cj4+Pj4KPj4+PiB1c2Vyc3BhY2Ugd3JpdGUgSVJRRkQgLT4gdnEtPmNiKCkgLT4gYW5v dGhlciBJUlFGRC4KPj4+Pgo+Pj4+IEl0IGxvb2tzIGxpa2UgaW5jcmVhc2luZyBFVkVOVEZEX1dB S0VVUF9ERVBUSCBzaG91bGQgYmUgc3VmZmljaWVudD8KPj4+Pgo+Pj4gQWN0dWFsbHkgSSBtZWFu IHRoZSBkZWFkbG9jayBkZXNjcmliZWQgaW4gY29tbWl0IGYwYjQ5M2UgKCJpb191cmluZzoKPj4+ IHByZXZlbnQgcG90ZW50aWFsIGV2ZW50ZmQgcmVjdXJzaW9uIG9uIHBvbGwiKS4gSXQgY2FuIGJy ZWFrIHRoaXMgYnVnCj4+PiBmaXggaWYgd2UganVzdCBpbmNyZWFzZSBFVkVOVEZEX1dBS0VVUF9E RVBUSC4KPj4KPj4gT2ssIHNvIGNhbiB3YWl0IGRvIHNvbWV0aGluZyBzaW1pbGFyIGluIHRoYXQg Y29tbWl0PyAodXNpbmcgYXN5bmMgc3R1ZmZzCj4+IGxpa2Ugd3EpLgo+Pgo+IFdlIGNhbiBkbyB0 aGF0LiBCdXQgaXQgd2lsbCByZWR1Y2UgdGhlIHBlcmZvcm1hbmNlLiBCZWNhdXNlIHRoZQo+IGV2 ZW50ZmQgcmVjdXJzaW9uIHdpbGwgYmUgdHJpZ2dlcmVkIGV2ZXJ5IHRpbWUga3ZtIGtpY2sgZXZl bnRmZCBpbgo+IHZob3N0LXZkcGEgY2FzZXM6Cj4KPiBLVk0gd3JpdGUgS0lDS0ZEIC0+IG9wcy0+ a2lja192cSAtPiBWRFVTRSB3cml0ZSBLSUNLRkQKPgo+IFRoYW5rcywKPiBZb25namkKCgpSaWdo dCwgSSB0aGluayBpbiB0aGUgZnV0dXJlIHdlIG5lZWQgdG8gZmluZCBhIHdheSB0byBsZXQgS1ZN IHRvIHdha2V1cCAKVkRVU0UgZGlyZWN0bHkuCgpIYXZuJ3QgaGFkIGEgZGVlcCB0aG91Z2h0IGJ1 dCBpdCBtaWdodCB3b3JrIGxpa2UgaXJxIGJ5cGFzcyBtYW5hZ2VyLgoKVGhhbmtzCgoKX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KVmlydHVhbGl6YXRpb24g bWFpbGluZyBsaXN0ClZpcnR1YWxpemF0aW9uQGxpc3RzLmxpbnV4LWZvdW5kYXRpb24ub3JnCmh0 dHBzOi8vbGlzdHMubGludXhmb3VuZGF0aW9uLm9yZy9tYWlsbWFuL2xpc3RpbmZvL3ZpcnR1YWxp emF0aW9u