From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 D6B88476CE2; Thu, 3 Sep 2026 10:11:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788430314; cv=none; b=Sc9Z0jj/gv9pZ5dPuVBDQnybBW9CVO7AqkA3lX0PrSSUBMBDDgfqc7T5r7rTFltJ1IS/jg4DO8hgSpLupP0KGVi9YI41lvP6aGmNFyq72YNGyP0Nu3h+D/bsQxOZofBHyhZ/49u5TtvkGkmkPsOOwihrJBRV7K7hUlPbhlcguto= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788430314; c=relaxed/simple; bh=BN4qunNBubpj0XR3wKSg04dnQbkN+UbGnKV1S5NmCEU=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=iSG7f1hM1Ved0n/bxX2lnQCHiTZZjeYRs9Uf69cm5u0m3sAWnkNKVYksyyopXw+hQxx9TsRS3hSlcYI65rzTlbQ8xzrZC41+umaOBo767lHc/v/5lgWjtiJdiKGHd4FVEf/9kroO9/Q4QMfjZw2ZIbKsF5UKT+aTX+TvH7A6IBE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=VBTTOy4Z; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="VBTTOy4Z" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 93E311F000E9; Thu, 3 Sep 2026 10:11:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788430311; bh=ATnn0rFlXTYrVtedHEnWgM8vXFFmNhxFeLJmYOeDXBk=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=VBTTOy4Zghb2X+R2qVo4ULeLYQIJvXRTePh93UEcOu76QCZm+hfproMO+r/Nfbqd5 zWGprDLfpTGL9xeX6uOll5EclMwhO2WTri87vDXyT1TFmz6GNgT6oHXr6vevlAgc1s W5qfqa6hdHIW8jGHtMGQuKFLPPA1E8kdQT4W5dri3GC3+S032rNC0D/txLxmRaMn17 rUF+tNB1CjWzHug8aRT3aAAxcJxFu5sAcJBTouGc0KX0TBs0OVCLcK3ExZKDlHV68L LE6Qjyj7iTugogz/OPp7Ik18wpw6GlnnV3jDn93TCs+BrUAxb2bG3miEOpzNqG7hVS m+kgfsrPHg8gA== Message-ID: <0082d06b-381d-4001-9ea6-cd3217e437dd@kernel.org> Date: Thu, 3 Sep 2026 12:11:45 +0200 Precedence: bulk X-Mailing-List: rust-for-linux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 09/12] rust: mm: sheaf: allow use of C initialized static caches Content-Language: en-US To: Andreas Hindborg , Tamir Duberstein , Miguel Ojeda , Boqun Feng , Gary Guo , =?UTF-8?Q?Bj=C3=B6rn_Roy_Baron?= , Benno Lossin , Alice Ryhl , Trevor Gross , Danilo Krummrich , Daniel Almeida , Alexandre Courbot , =?UTF-8?Q?Onur_=C3=96zkan?= , Matthew Wilcox , Andrew Morton , Lorenzo Stoakes , "Liam R. Howlett" , Harry Yoo , Hao Li , Christoph Lameter , David Rientjes , Roman Gushchin Cc: rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org References: <20260902-xarray-entry-send-v5-0-d18adae40708@kernel.org> <20260902-xarray-entry-send-v5-9-d18adae40708@kernel.org> From: "Vlastimil Babka (SUSE)" Autocrypt: addr=vbabka@kernel.org; keydata= xsFNBFZdmxYBEADsw/SiUSjB0dM+vSh95UkgcHjzEVBlby/Fg+g42O7LAEkCYXi/vvq31JTB KxRWDHX0R2tgpFDXHnzZcQywawu8eSq0LxzxFNYMvtB7sV1pxYwej2qx9B75qW2plBs+7+YB 87tMFA+u+L4Z5xAzIimfLD5EKC56kJ1CsXlM8S/LHcmdD9Ctkn3trYDNnat0eoAcfPIP2OZ+ 9oe9IF/R28zmh0ifLXyJQQz5ofdj4bPf8ecEW0rhcqHfTD8k4yK0xxt3xW+6Exqp9n9bydiy tcSAw/TahjW6yrA+6JhSBv1v2tIm+itQc073zjSX8OFL51qQVzRFr7H2UQG33lw2QrvHRXqD Ot7ViKam7v0Ho9wEWiQOOZlHItOOXFphWb2yq3nzrKe45oWoSgkxKb97MVsQ+q2SYjJRBBH4 8qKhphADYxkIP6yut/eaj9ImvRUZZRi0DTc8xfnvHGTjKbJzC2xpFcY0DQbZzuwsIZ8OPJCc LM4S7mT25NE5kUTG/TKQCk922vRdGVMoLA7dIQrgXnRXtyT61sg8PG4wcfOnuWf8577aXP1x 6mzw3/jh3F+oSBHb/GcLC7mvWreJifUL2gEdssGfXhGWBo6zLS3qhgtwjay0Jl+kza1lo+Cv BB2T79D4WGdDuVa4eOrQ02TxqGN7G0Biz5ZLRSFzQSQwLn8fbwARAQABzSNWbGFzdGltaWwg QmFia2EgPHZiYWJrYUBrZXJuZWwub3JnPsLBsAQTAQoAWhYhBKlA1DSZLC6OmRA9UCJPp+fM gqZkBQJqFFy6GxSAAAAAAAQADm1hbnUyLDIuNSsxLjEyLDIsMgIbAwUJGtCBUAULCQgHAwUV CgkICwUWAgMBAAIeBQIXgAAKCRAiT6fnzIKmZJIUEADFx/tREzUImHrEwVHeSvDFmA7tJysI UVrlvrM09E7GIuzphzv7jYmo8n3ANpCczLEVr4G0syYQdTigaZgv3+FQDIIzhKih1IHhu1Ei XHlywNWKnQxxQEUNi5Mwx43wQz5XVw9F1A7gtKBKNtfogO511hAbrzagrYajyQacEJ/+sfhZ 9Da8ltHIXD8pcYaHUfQgEusCgmEd9+KrUwrTbckFKmYq5chuE6yJ4J0EmWknL096jIE6CnzF FRslQ3B1UKDjxVsm1ZHfir5NeWszLkTvGFsddFaWTgh8UycESG6VQzKXjjewXu2pG7YQYRpj QKm1W5X2TkwWkXRBZTmfmbhxIUMh3+zf5wQ463rSmDN/8v81tdqBtAW6rH/kzg1GvkaTHXn0 507yEHFzBksk2viAuIxxr7km8+/KARYLIdGtx30EG8cKzAUZOK6WqxtNCsXUJNrVE8CWrCaD icoNu7Fs1c5hmPHdSTnU48ce67449DdnO4neLSNhRiGlMHJgfJUmgrxu/hcYeOZ3haWmEQ2w uW1Mh01OHi8QZHCEyAbABrPs9GUgccc/4eYXX9hIgxfSkYzn8f+8NuIFPWl/0uTvjgqU29FQ SbzOLxHq9439Ox40G5mS5eZXRGxITYR+6TXvRGI6P/264jvflnr/pDGUttaikU+0W+1uxgKH cmYbEc7ATQRbGTU1AQgAn0H6UrFiWcovkh6EXVcl+SeqyO6JHOPm+e9Wu0Vw+VIUvXZVUVVQ La1PQDUi6j00ChlcR66g9/V0sPIcSutacPKfdKYOBvzd4rlhL8rfrdEsQw5ApZxrA8kYZVMh FmBRKAa6wos25moTlMKpCWzTH84+WO5+ziCTsTUZASAToz3RdunTD+vQcHj0GqNTPAHK63sf bAB2I0BslZkXkY1RLb/YhuA6E7JyEd2pilZOrIuBGl/5q2qSakgnAVFWFBR/DO27JuAksYnq +aH8vI0xGvwn75KqSk4UzAkDzWSmO4ZHuahKtQgZNsMYV+PGayRBX9b9zbldzopoLBdqHc4n jQARAQABwsF8BBgBCgAmAhsMFiEEqUDUNJksLo6ZED1QIk+n58yCpmQFAmfIHFQFCRYU6J8A CgkQIk+n58yCpmS2PA//bqN1LfcotmArgElsa+0EGZSQlYgK48pm8WAeTXTngudP9IJ4SuKY HR5RNjHcBeqN+Me0zxRqYzRb8nGanHEkDyf4Im8DQM8d6vbyU+FcPmG4skud4kgS1zMHnlVd SXfSIwKC/hKgdHG8aBV7545Lz9X6Iohea+94wneD0aw/hqF+QWewGZhWJriWAZtvEkzNjQOi 4U9F/trLten/x7bpphDSnDMKJtITbtzATT1Dq7o7VpIUK1nCTQALMuMjKCdi8OdU/+V+R3O4 0PXWvX8qrvqYapVbZ+9KqT74FsuB0Ya9uXwgBF2Q6cRuETZk5vqaqKxzqoQZCO8AOz/58j6O 2RHNy/mZEN+7tJ5Tsq42zVJ4jxsT8b9YplavCMsnBgDeRWhcbYhCyttoL7nYISyWg4kQYZ/P wIV3OuNv2f8iKYsxNsRuClOAF82+gvqOy1/1pprFjy8uo2pkoOrb63aOP3vO5VHnRKgra6dq NcaZ+c6J4H+nEJGi2SkHAUJz5oBzuThvPudLvPA/SK8sKoM01IRxSihev/S/5WLazXB1PGem OCbvzC1IjWJJraxiDJ5IygokapUa2RP7+WBR22skQ3SSl6G107QgWKSyTOGWEaRmV53vxQLV jXuCmzSSasTL60zq5yGrT4/DYQVSNEUiUbG4pYekxJujNeEDkUlky0Y= In-Reply-To: <20260902-xarray-entry-send-v5-9-d18adae40708@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 9/2/26 15:26, Andreas Hindborg wrote: > Extend the sheaf abstraction to support caches initialized by C at kernel > boot time, in addition to dynamically created Rust caches. Nit: in C code caches can be also dynamically created :) > Introduce `KMemCache` as a transparent wrapper around `kmem_cache` for > static caches with `'static` lifetime. Rename the previous `KMemCache` > to `KMemCacheHandle` to represent dynamically created, reference-counted > caches. > > Add `Static` and `Dynamic` marker types along with `StaticSheaf` and > `DynamicSheaf` type aliases to distinguish sheaves from each cache type. > The `Sheaf` type now carries lifetime and allocation mode type parameters. > > Add `SBox::into_ptr()` and `SBox::static_from_ptr()` methods for passing > allocations through C code via raw pointers. > > Add `KMemCache::from_raw()` for wrapping C-initialized static caches and > `Sheaf::refill()` for replenishing a sheaf to a minimum size. > > Export `kmem_cache_prefill_sheaf`, `kmem_cache_return_sheaf`, > `kmem_cache_refill_sheaf`, and `kmem_cache_alloc_from_sheaf_noprof` to > allow Rust module code to use the sheaf API. > > Cc: Vlastimil Babka > Cc: "Liam R. Howlett" > Cc: "Matthew Wilcox (Oracle)" > Cc: Lorenzo Stoakes > Cc: linux-mm@kvack.org > Assisted-by: LLM > Signed-off-by: Andreas Hindborg Acked-by: Vlastimil Babka (SUSE)