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 3577C280CCE for ; Thu, 24 Apr 2025 17:57:30 +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=1745517452; cv=none; b=MTW1MLsRiuJCyeaQ56cIM8doZdAjOtAZXeQpNB0VlnU9dIt8MH4VcDM01pFphBB0EpouIABpj5JLOxYptIifo8JBVB+X0YeAXPwaT5SXbmXBJkT0/SFi4r0wlVD/xhr50FFW/4l0HILUyZTSOvXN15XKcAkx/tUAl/NhhgBvCCU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745517452; c=relaxed/simple; bh=IYSsaVyZ/jQu86leRWPMsvLKyxubireBxzBp6lyjr4c=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=mWCHnSASvuUqnLMMqPu69wIoA3Xyszg/57b0UMtCOqw+6WW1PNMVelGOKTjWhdbhvbc+hi/JN7dMADx/vgzvl8h84irAbRGFMpzeh7abxy44qmY6MBVpbzYUgCjiK93xqBI9DBZ9nf0oQmKn8Y3/g1EgRWRxp02VyAn4tYbBwtw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (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=lhPPXIFy; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (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="lhPPXIFy" 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=HNQE79Zzehz0xxWtckooaLaCuXbA2OFuRvuA5IaVdgI=; b=lhPPXIFyJsxsg/+bh6ukwIcAVd XWXlQdofLH16fK9mTY8R70xBbPfhgkyFM65Zg4pADMzDZgt0ZUdy9ABLEJvJPDNjfHvzWUALtX83E zEzO7WJfNHorxhfip9jDdO/Pm2WjW03KoHqnX2yCtAADii1G/NJ/CkjtX6/O1LodGtRi4sDrbcqCX 3NJp1UcQVdpImf771pJaEVD+eAAKCjK/92v9EwaRoDeVoz2dXr/4O0+avcu3J4YX0kcCfdOEnmb/I doRdudKIPPOKP80Z4OudmKzyuO6m7AV03xIy+IAjfOBOvhY12F02Py3nm1GSOAOHlvNz1IE+qtOEf YljB1eYA==; Received: from willy by casper.infradead.org with local (Exim 4.98.2 #2 (Red Hat Linux)) id 1u80p8-0000000CxI1-2BGr; Thu, 24 Apr 2025 17:57:22 +0000 Date: Thu, 24 Apr 2025 18:57:22 +0100 From: Matthew Wilcox To: Lorenzo Stoakes Cc: Andrew Morton , David Hildenbrand , Zi Yan , Baolin Wang , "Liam R . Howlett" , Nico Pache , Ryan Roberts , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] MAINTAINERS: add mm THP section Message-ID: References: <20250424111632.103637-1-lorenzo.stoakes@oracle.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: <20250424111632.103637-1-lorenzo.stoakes@oracle.com> On Thu, Apr 24, 2025 at 12:16:32PM +0100, Lorenzo Stoakes wrote: > As part of the ongoing efforts to sub-divide memory management > maintainership and reviewership, establish a section for Transparent Huge > Page support and add appropriate maintainers and reviewers. I'm quite queasy about this. I'm doing my best to make "THP" disappear as a concept. How would you define what THP is? Originally, it was PMD-sized-and-aligned allocations, and some of the way we expose it to userspace, that's still the interpretation. But we also have folios which are of some hardware-defined magic sizes, as well as (for filesystems, at least) random other non-zero orders. Memory is just managed in variously sized quantities. There should be nothing magic about "THP", and I'm still annoyed at the anon-mem people for baking various magic sizes into user-visible APIs.