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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 9D26FC624D7 for ; Thu, 3 Sep 2026 10:11:55 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id BF8806B00AE; Thu, 3 Sep 2026 06:11:54 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id BD0436B00B0; Thu, 3 Sep 2026 06:11:54 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id AE7FE6B00B2; Thu, 3 Sep 2026 06:11:54 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id 8E3A96B00AE for ; Thu, 3 Sep 2026 06:11:54 -0400 (EDT) Received: from smtpin12.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay09.hostedemail.com (Postfix) with ESMTP id 1A92980473 for ; Thu, 3 Sep 2026 10:11:54 +0000 (UTC) X-FDA: 85172034948.12.A46326E Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf30.hostedemail.com (Postfix) with ESMTP id 4434A80002 for ; Thu, 3 Sep 2026 10:11:52 +0000 (UTC) Authentication-Results: imf30.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=VBTTOy4Z; spf=pass (imf30.hostedemail.com: domain of vbabka@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=vbabka@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1788430312; b=6X+fsI93WkrQCPmNMd29bG0yOf48zR8LEUaqbYItl2IcxFl/dp83lsHHnww8zmmgSBfahG tj25KKHsRbtXvXIrP1YPdjr6HohbYcOZCnz06bkC6lOiz99+0OXLumRqeh0beBgoAJ4Z1O 3BYC7sIcqWPPdrbxVLyKrqb1FY8P7Pc= ARC-Authentication-Results: i=1; imf30.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=VBTTOy4Z; spf=pass (imf30.hostedemail.com: domain of vbabka@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=vbabka@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1788430312; h=from:from:sender: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:dkim-signature; bh=ATnn0rFlXTYrVtedHEnWgM8vXFFmNhxFeLJmYOeDXBk=; b=MEktXjUzi7iOunA0wiqL4bsNppJzmRMgNKsu8YjcJ6hHQQSHeKAgBqNr9vR0LKXkVWuUjw JdQyhALlVg5P+jNTvaqR73whHS/zVUQUSE6neDblr5NxVzA26SBxEeKQ/DC8ovOY94TYEH XxpamAjVrSrpmoWC8bC4bzpq2D+VKmw= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 7660241AC1; Thu, 3 Sep 2026 10:11:51 +0000 (UTC) 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 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 X-Rspam-User: X-Stat-Signature: fmbepys9zsfwudn9e19mjk3k7rwxqp1p X-Rspamd-Queue-Id: 4434A80002 X-Rspamd-Server: rspam06 X-HE-Tag: 1788430312-306888 X-HE-Meta: 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 KhBac24n uwpwYCa5oYvpNipJTBwYlmLL2zGj5XcpEYXlzRgY91lr/6w1UoI12t+NoSn2KAvFGwY38vqpN18R/F1vfbL6OM+QDJlTP6a7gN4FV753hxYWaYyCgujYxQ2ovGxPamL/RTykRt+TXHff2F0pL9tU6K5IFzBFdEvEh/lUxhmHDFkJM9x+uInS376cvYYRIGiBNcBRHLSGiVgCbzxSMKOA5DSZYJek8VNsqKp6EbeDo9BI3nu8/Yt6korDRNRN0VPEGA9DuzQIWGbkFdIr7L8azKIJUbcQxHYe0NlLhWkGn//CX+KmKZ8qdHESPQT5QLQBcLJanhkZjNT1YlegC0W6hfckKka9+WJ5RPh9pXkzTFUZnl0pAWv6BXOdCycRY8ZKqh73NosH71WdIi3K6WimswQQcM1L7gxwODDrErbnCk6zkpp4= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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)