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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3643FCD4F3C for ; Wed, 20 May 2026 08:11:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=C+phwq30yxq7DfenRfilIaC6TJGX8wH0pGp11V81et4=; b=0T3a6s+VNu4arS Xm9A9AJS9yjvlH8s6JBvQaESPITAJUy+4kfWeTC9M16PsFDuFpIB9+GklJmrcJVajDIqCeBXJOajb Xii2rh58lGh/R6HmzfUatxpI5pIGEk1YL2MnpCVg/1bONvmPpx4BRomGaQ3Ah4t9ZIUnoPfMxcaNt TKCdYGa+5Mn8vSCwxk+G9beC35a3glOuUwjUHx3VAolxB/QW1dRuo+dFnJn1dLzDd6ho1HmF3ohP3 mKkiO8/0dzg/3r8+5pg5jsoPMTagHW2Sjgq8DVtGWeoIJtmTFnem1ZAZMs7SVF0kg2pdu9agQQTpe hwE01gGTgqTmTPixswDg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wPc1e-00000003u7Z-3SHf; Wed, 20 May 2026 08:11:34 +0000 Received: from tor.source.kernel.org ([2600:3c04:e001:324:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wPc1b-00000003u6G-3E4d; Wed, 20 May 2026 08:11:33 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 1089060129; Wed, 20 May 2026 08:11:31 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 83B3F1F000E9; Wed, 20 May 2026 08:11:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1779264690; bh=CXxzzbCeNo3sDfk3dzWGFhN8IehnqsFdAWbxh92ducY=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=bnkpa3FzKkUUdWFG0smRQZfU40dk46M5NgdqdIyfXEPD1h20NL7bKr72VFJoHgNPK Zpt0f97bM5yOlAFtMWk1oRJvIjsf1+ECrk3QzWUIz/BWNXDJW0ZYJ2FFouGZZmuMrM Wo4p0Vkb6/RLl4doyo6ixLI4oE7LpahGy1KRkeyMwou5u+LN+Sw4rNKaJQ+5yI6oFf vB2uTeyCpF+Vdg78uiOeOk2xvyBn7mhcgugFMKCdMzmjrO0Fwf6NwhxUTUhIuawNn+ NrJZl4Ke/LYbTbo3EkZd4QjkXwxp4OdeRjoSgwxJx/swz4bFwcKMo8A4KVWXBu3sjy W937Gs5yLpfaw== Date: Wed, 20 May 2026 09:11:20 +0100 From: Lorenzo Stoakes To: Yang Shi Cc: Barry Song , Matthew Wilcox , surenb@google.com, akpm@linux-foundation.org, linux-mm@kvack.org, david@kernel.org, liam@infradead.org, vbabka@kernel.org, rppt@kernel.org, mhocko@suse.com, jack@suse.cz, pfalcato@suse.de, wanglian@kylinos.cn, chentao@kylinos.cn, lianux.mm@gmail.com, kunwu.chan@gmail.com, liyangouwen1@oppo.com, chrisl@kernel.org, kasong@tencent.com, shikemeng@huaweicloud.com, nphamcs@gmail.com, bhe@redhat.com, youngjun.park@lge.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, Nanzhe Zhao Subject: Re: [PATCH v2 0/5] mm: reduce mmap_lock contention and improve page fault performance Message-ID: References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org T24gVHVlLCBNYXkgMTksIDIwMjYgYXQgMDI6MDI6MDlQTSAtMDcwMCwgWWFuZyBTaGkgd3JvdGU6 Cj4gT24gVHVlLCBNYXkgMTksIDIwMjYgYXQgMTE6NDHigK9BTSBZYW5nIFNoaSA8c2h5ODI4MzAx QGdtYWlsLmNvbT4gd3JvdGU6Cj4gPiA+Cj4gPiA+ID4KPiA+ID4gPiA+Cj4gPiA+ID4gPiBTZWNv bmRseSwgaWYgdm1hLT5hbm9uX3ZtYSBpcyBOVUxMLCBpdCBiYXNpY2FsbHkgbWVhbnMgZWl0aGVy IG5vIHBhZ2UKPiA+ID4gPiA+IGZhdWx0IGhhcHBlbmVkIG9yIG5vIGNvdyBoYXBwZW5lZCwgc28g dGhlcmUgaXMgbm8gcGFnZSB0YWJsZSB0byBjb3B5LAo+ID4gPiA+ID4gdGhpcyBpcyBhbHNvIHdo YXQgY29weV9wYWdlX3JhbmdlKCkgZG9lcyBjdXJyZW50bHkuIFNvIHdlIGNhbiBzaHJpbmsKPiA+ ID4gPiA+IHRoZSBjcml0aWNhbCBzZWN0aW9uIHRvOgo+ID4gPiA+Cj4gPiA+ID4gRmlyc3RseSwg d2l0aCBubyBWTUEgd3JpdGUgbG9jaywgIXZtYS0+YW5vbl92bWEgbWVhbnMgYSBmYXVsdCBjYW4g cmFjZSBhbmQKPiA+ID4gPiBzZWNvbmRseSBjb3B5X3BhZ2VfcmFuZ2UoKSBjaGVja3Mgdm1hX25l ZWRzX2NvcHkoKSwgdGhlcmUgYXJlIG90aGVyIGNhc2VzIC0gUEZOCj4gPiA+ID4gbWFwcywgbWl4 ZWQgbWFwcywgVUZGRCBXL1AgKHVnaCksIGd1YXJkIHJlZ2lvbnMuCj4gPiA+ID4KPiA+ID4gPiBT byB5ZWFoIHRoaXMgaXNuJ3Qgc3VmZmljaWVudC4KPiA+ID4KPiA+ID4gSG93ZXZlciB0aGlzIGlz IHRydWUuLi4KPiA+Cj4gPiBZZXMsIGZhdWx0IGNhbiByYWNlIHdpdGggZm9yay4gQmFzaWNhbGx5 IHRoaXMgaXMgYWN0dWFsbHkgdGhlIHB1cnBvc2UKPiA+IG9mIHRoaXMgaWRlYS4gV2UgY2FuIGhh dmUgaW1wcm92ZWQgcGFnZSBmYXVsdCBzY2FsYWJpbGl0eS4gSW4gbXkKPiA+IHByb3Bvc2FsICh0 YWtlIHdyaXRlIHZtYSBsb2NrIGlmIHZtYS0+YW5vbl92bWEgaXMgbm90IE5VTEwpLCB0aGUgcmFj ZQo+ID4ganVzdCBoYXBwZW5zIG9uIHRoZSBWTUFzIHdoaWNoIHBhZ2UgZmF1bHQgaGFzIG5vdCBo YXBwZW5lZCBvbiBiZWZvcmUuCj4KPiBTb3JyeSwgdGhpcyBpcyBpbmNvcnJlY3QuIFBhZ2UgZmF1 bHQgY2FuJ3QgaGFwcGVuIG9uIHRob3NlIFZNQXMKPiBiZWNhdXNlIHBhZ2UgZmF1bHQgbmVlZHMg dG8gY3JlYXRlIGFub25fdm1hLCBidXQgaXQgcmVxdWlyZXMgdGFraW5nCj4gbW1hcF9sb2NrLgo+ IElmIGFub25fdm1hIGlzIG5vdCBOVUxMLCB2bWEgd3JpdGUgbG9jayB3aWxsIHNlcmlhbGl6ZSBh Z2FpbnN0IHBhZ2UKPiBmYXVsdC4gU28gdGhlcmUgc2hvdWxkIGJlIG5vIHJhY2Ugd2l0aCBwYWdl IGZhdWx0LiBSZW1vdmluZyB2bWEgd3JpdGUKPiBsb2NrIHN1Z2dlc3RlZCBieSBCYXJyeSBtYXkg aW5jcmVhc2UgcmFjZS4KCkZpcnN0bHksIGxldCdzIG5vbmUgb2YgdXMgYmUgd29ycmllZCBhYm91 dCBtYWtpbmcgbWlzdGFrZXMgaGVyZSwgdGhlIGFub25fdm1hCnN0dWZmIGlzIGNvbmZ1c2luZywg YW5kIEkndmUgc3RhcmVkIGF0IGl0IG1vcmUgdGhhbiBtb3N0bHksIGFuZCBldmVuIHNvIEkKbWFu YWdlZCB0byBtYWtlIG1pc3Rha2VzIChhcyBjb3JyZWN0ZWQgaGVyZSkgYW5kIGZvcmdldCBkZXRh aWxzIDopKQoKSXQncyBhIHNpZ24gaXQgYWxsIG5lZWRzIHNpbXBsaWZ5aW5nLCBidXQgaGV5IHRo YXQncyB3aGF0IG15IHNjYWxhYmxlIENvVwpwcm9qZWN0IGlzIChwYXJ0bHkpIGFib3V0IDopCgpS ZW1vdmluZyB0aGUgVk1BIHdyaXRlIGxvY2sgd291bGQgY2F1c2UgcmFjZXMgd2l0aCBwYWdlIGZh dWx0IHdoaWNoIGNhbiByZXN1bHQKaW4gcGFnZSB0YWJsZXMgYmVpbmcgaW5zdGFsbGVkIHdoaWNo IGFyZSB0aGVuIG5vdCBjb3JyZWN0bHkgZHVwbGljYXRlZCBmb3IKcmFuZ2VzIHRoYXQgbXVzdCBi ZS4KCkFuZCBhZ2FpbiBJIHRoaW5rIHRoZSB1bmRlcmx5aW5nIHRoaW5nIGhlcmUgb3ZlcmFsbCBJ IHRoaW5rIGlzOgoKMS4gQ2xlYXJseSBtYW55IGNhc2VzIHJlcXVpcmUgc2VyaWFsaXNhdGlvbiAo YW55IHRoYXQgY2F1c2UgY29weV9wYWdlX3JhbmdlKCkgdG8KICAgZmlyZSkuCgoyLiBJZiB3ZSB3 ZXJlIHRvIGRlY2lkZSBub3QgdG8gdGFrZSBhIGxvY2sgd2l0aCBjb25jdXJyZW50IHBhZ2UgZmF1 bHRzLCB0aGF0CiAgIGxheXMgYSB0cmFwIGZvciBhbnkgZnV0dXJlIGNoYW5nZSB0aGF0IChyZWFz b25hYmx5KSBhc3N1bWVzIHRoYXQgcGFnZSB0YWJsZXMKICAgY2Fubm90IGJlIHNpbXVsdGFuZW91 c2x5IGNvcGllZCB3aGlsZSBiZWluZyBhY2Nlc3NpYmxlIHRvIHBhZ2UgZmF1bHQKICAgaGFuZGxl cnMsIHdoaWNoIGlzIGJ1ZyBwcm9uZS4KCjMuIEFzIHBlciAyLCBldmVuIGlmIHdlIHdlcmUgdG8g b25seSB0YWtlIHRoZSBsb2NrIHdoZW4gd2UgZmVsdCB3ZSBhYnNvbHV0ZWx5CiAgIG5lZWRlZCB0 bywgd2Ugc3RpbGwgY2F1c2UgcmlzayB0aHJvdWdoIGFkZGluZyB5ZXQgYW5vdGhlciAneW91IGp1 c3QgaGF2ZSB0bwogICBrbm93JyByaXNrIHRvIHRoaXMgcGFydCBvZiBtbS4KCjQuIFRoZSBzZXJp YWxpc2F0aW9uIGlzIHF1aXRlIGxpa2VseSByZWxpZWQgdXBvbiBieSBvdGhlciB0aGluZ3MsIHRo aXMgaXMgb2Z0ZW4KICAgdGhlIGNhc2UgaW4gbW0sIGFuZCB3ZSBtYXkgb25seSByZWFsaXNlIHRo YXQgc3VjaCBzZXJpYWxpc2F0aW9uIGlzIGNyaXRpY2FsCiAgIGF0IHRoZSBwb2ludCBhIHN1YnRs ZSBpc3N1ZSBhcmlzZXMgb3V0IG9mIGl0LgoKNS4gRm9yayBpcyBvbmUgb2YgdGhlIG1vc3Qgc2Vu c2l0aXZlLCBpbnR1YXRpb24tZGVmeWluZywgY29tcGxpY2F0ZWQsIGFuZAogICBjb3JuZXItIGNh c2UtcHJvYmxlbS1iYWl0aW5nIGFyZWFzIG9mIG1tIGFuZCBJIHJlYWxseSBvcHBvc2UgdXMgY2hh bmdpbmcKICAgZnVuZGFtZW50YWwgYmVoYXZpb3VyIGhlcmUgdW5sZXNzIGluY3JlZGlibHkgd2Vs bCBqdXN0aWZpZWQuCgpPbiB0aGlzIGJhc2lzLCBsZXQncyBsZXQgdGhlIHNsZWVwaW5nIGRvZ3Mg bGllIGFuZCBsZWF2ZSBmb3JrIGFsb25lIEkgdGhpbmsgOikKCkkgdGhpbmsgSSBhbSBmYXIgbW9y ZSBpbmNsaW5lZCB0byB0YWtlIEJhcnJ5J3MgZmF1bHQgYXBwcm9hY2ggKGFzIEkndmUgc2FpZCB0 bwpoaW0pIHZzLiBjaGFuZ2luZyBmb3JrIGJlaGF2aW91ci4KCkJ1dCBJIHdhbnQgdG8gbWFrZSBz dXJlIHRoZXJlJ3Mgbm90IGEgJ3RoaXJkIHdheScgdGhhdCBjb3VsZCBhdm9pZCBlaXRoZXIhCgpJ IGFtIGdvaW5nIHRvIGhhdmUgYSBsb29rIHRocm91Z2ggQmFycnkncyBzZXJpZXMgaW4gZGV0YWls IHNvIHdlIGNhbiBoYXZlIHNvbWUKbW92ZW1lbnQgb24gdGhpcyBvbmUgd2F5IG9yIGFub3RoZXIg OikKCj4KPiBUaGFua3MsCj4gWWFuZwo+CgpDaGVlcnMsIExvcmVuem8KCl9fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCmxpbnV4LXJpc2N2IG1haWxpbmcgbGlz dApsaW51eC1yaXNjdkBsaXN0cy5pbmZyYWRlYWQub3JnCmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQu b3JnL21haWxtYW4vbGlzdGluZm8vbGludXgtcmlzY3YK