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]) by smtp.lore.kernel.org (Postfix) with ESMTP id 10B98D2AB25 for ; Tue, 29 Oct 2024 11:52:54 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 929CB6B009F; Tue, 29 Oct 2024 07:52:53 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 8D8E06B00A2; Tue, 29 Oct 2024 07:52:53 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 753126B00A3; Tue, 29 Oct 2024 07:52:53 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id 56F706B009F for ; Tue, 29 Oct 2024 07:52:53 -0400 (EDT) Received: from smtpin01.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id 1C96E1210E6 for ; Tue, 29 Oct 2024 11:52:53 +0000 (UTC) X-FDA: 82726477008.01.41411DF Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.223.131]) by imf13.hostedemail.com (Postfix) with ESMTP id 8176B20006 for ; Tue, 29 Oct 2024 11:52:24 +0000 (UTC) Authentication-Results: imf13.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=fCxY2jKD; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=i1eTe7Di; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=fCxY2jKD; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=i1eTe7Di; dmarc=none; spf=pass (imf13.hostedemail.com: domain of vbabka@suse.cz designates 195.135.223.131 as permitted sender) smtp.mailfrom=vbabka@suse.cz ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1730202653; a=rsa-sha256; cv=none; b=EEZueyQgX3fPoVF9oBe5bRi1xWa4E0ROPbZcno0HTynCaoeupXNOMMBf4/v/ujhZrXjIYC YpKxLhwf7dRh0uMa8/VWhkmFcWETxwkD9dXxixq6ULJLuouRDOdTr5oUBK/vsp1W2Ie3r4 ZDSDuMXymdUlWp1td20WQ06H+549r+k= ARC-Authentication-Results: i=1; imf13.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=fCxY2jKD; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=i1eTe7Di; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=fCxY2jKD; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=i1eTe7Di; dmarc=none; spf=pass (imf13.hostedemail.com: domain of vbabka@suse.cz designates 195.135.223.131 as permitted sender) smtp.mailfrom=vbabka@suse.cz ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1730202653; 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=8jwJ/r0rxN3aDQpA/l0my7cK64hXUya0JkydEl9yDgY=; b=mKUxDz859sfvtUSsnSMp7hORFOGXWDsM9gkxsd2J+iJX1fV2vzqGgtecOSo4m3A0LLFnLh pEfABCMQEv7paIZKb+gBqWeaxJjF4QJo0el5fLzYGblkNJb9GS7p9Pz8SVAlERgmBAlh3M VLLwFbPA/qi46nzyHVmycNKT9GSHLBU= Received: from imap1.dmz-prg2.suse.org (unknown [10.150.64.97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 147AF1FB8E; Tue, 29 Oct 2024 11:52:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1730202768; h=from:from:reply-to: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:autocrypt:autocrypt; bh=8jwJ/r0rxN3aDQpA/l0my7cK64hXUya0JkydEl9yDgY=; b=fCxY2jKDxBvGl15Gj81Q9IqiYhz4vUdMdiQwr0+1EOLZJdUZYgifSue+ltS1KvxvmJM4AP ShYEsIEzmEk7CldAP30xd/yEN8biKVpzuhMic4VnObRB5kbGWmZs5N4nk20wnxe2ua+9ai VvB2cQ/F3RFkbO7h5Er8/zdrOW82gaY= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1730202768; h=from:from:reply-to: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:autocrypt:autocrypt; bh=8jwJ/r0rxN3aDQpA/l0my7cK64hXUya0JkydEl9yDgY=; b=i1eTe7Di7gkcvu4lAE8xaoBuSZpMTpoddqY7AI0/qRN9zqVPFP3hfw3HhTrNYJN+rDpixb yE5wKC2gENrrYcDw== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1730202768; h=from:from:reply-to: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:autocrypt:autocrypt; bh=8jwJ/r0rxN3aDQpA/l0my7cK64hXUya0JkydEl9yDgY=; b=fCxY2jKDxBvGl15Gj81Q9IqiYhz4vUdMdiQwr0+1EOLZJdUZYgifSue+ltS1KvxvmJM4AP ShYEsIEzmEk7CldAP30xd/yEN8biKVpzuhMic4VnObRB5kbGWmZs5N4nk20wnxe2ua+9ai VvB2cQ/F3RFkbO7h5Er8/zdrOW82gaY= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1730202768; h=from:from:reply-to: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:autocrypt:autocrypt; bh=8jwJ/r0rxN3aDQpA/l0my7cK64hXUya0JkydEl9yDgY=; b=i1eTe7Di7gkcvu4lAE8xaoBuSZpMTpoddqY7AI0/qRN9zqVPFP3hfw3HhTrNYJN+rDpixb yE5wKC2gENrrYcDw== Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id C9FE2136A5; Tue, 29 Oct 2024 11:52:47 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id D5vAMI/MIGcSTQAAD6G6ig (envelope-from ); Tue, 29 Oct 2024 11:52:47 +0000 Message-ID: Date: Tue, 29 Oct 2024 12:52:47 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 tip/perf/core 1/4] mm: Convert mm_lock_seq to a proper seqcount Content-Language: en-US To: Andrii Nakryiko , linux-trace-kernel@vger.kernel.org, linux-mm@kvack.org, akpm@linux-foundation.org, peterz@infradead.org Cc: oleg@redhat.com, rostedt@goodmis.org, mhiramat@kernel.org, bpf@vger.kernel.org, linux-kernel@vger.kernel.org, jolsa@kernel.org, paulmck@kernel.org, willy@infradead.org, surenb@google.com, mjguzik@gmail.com, brauner@kernel.org, jannh@google.com, mhocko@kernel.org, shakeel.butt@linux.dev, hannes@cmpxchg.org, Liam.Howlett@oracle.com, lorenzo.stoakes@oracle.com, david@redhat.com, arnd@arndb.de, richard.weiyang@gmail.com, zhangpeng.00@bytedance.com, linmiaohe@huawei.com, viro@zeniv.linux.org.uk, hca@linux.ibm.com References: <20241028010818.2487581-1-andrii@kernel.org> <20241028010818.2487581-2-andrii@kernel.org> From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; 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 BB2T79D4WGdDuVa4eOrQ02TxqGN7G0Biz5ZLRSFzQSQwLn8fbwARAQABzSBWbGFzdGltaWwg QmFia2EgPHZiYWJrYUBzdXNlLmN6PsLBlAQTAQoAPgIbAwULCQgHAwUVCgkICwUWAgMBAAIe AQIXgBYhBKlA1DSZLC6OmRA9UCJPp+fMgqZkBQJkBREIBQkRadznAAoJECJPp+fMgqZkNxIQ ALZRqwdUGzqL2aeSavbum/VF/+td+nZfuH0xeWiO2w8mG0+nPd5j9ujYeHcUP1edE7uQrjOC Gs9sm8+W1xYnbClMJTsXiAV88D2btFUdU1mCXURAL9wWZ8Jsmz5ZH2V6AUszvNezsS/VIT87 AmTtj31TLDGwdxaZTSYLwAOOOtyqafOEq+gJB30RxTRE3h3G1zpO7OM9K6ysLdAlwAGYWgJJ V4JqGsQ/lyEtxxFpUCjb5Pztp7cQxhlkil0oBYHkudiG8j1U3DG8iC6rnB4yJaLphKx57NuQ PIY0Bccg+r9gIQ4XeSK2PQhdXdy3UWBr913ZQ9AI2usid3s5vabo4iBvpJNFLgUmxFnr73SJ KsRh/2OBsg1XXF/wRQGBO9vRuJUAbnaIVcmGOUogdBVS9Sun/Sy4GNA++KtFZK95U7J417/J Hub2xV6Ehc7UGW6fIvIQmzJ3zaTEfuriU1P8ayfddrAgZb25JnOW7L1zdYL8rXiezOyYZ8Fm ZyXjzWdO0RpxcUEp6GsJr11Bc4F3aae9OZtwtLL/jxc7y6pUugB00PodgnQ6CMcfR/HjXlae h2VS3zl9+tQWHu6s1R58t5BuMS2FNA58wU/IazImc/ZQA+slDBfhRDGYlExjg19UXWe/gMcl De3P1kxYPgZdGE2eZpRLIbt+rYnqQKy8UxlszsBNBFsZNTUBCACfQfpSsWJZyi+SHoRdVyX5 J6rI7okc4+b571a7RXD5UhS9dlVRVVAtrU9ANSLqPTQKGVxHrqD39XSw8hxK61pw8p90pg4G /N3iuWEvyt+t0SxDDkClnGsDyRhlUyEWYFEoBrrCizbmahOUwqkJbNMfzj5Y7n7OIJOxNRkB IBOjPdF26dMP69BwePQao1M8Acrrex9sAHYjQGyVmReRjVEtv9iG4DoTsnIR3amKVk6si4Ea X/mrapJqSCcBUVYUFH8M7bsm4CSxier5ofy8jTEa/CfvkqpKThTMCQPNZKY7hke5qEq1CBk2 wxhX48ZrJEFf1v3NuV3OimgsF2odzieNABEBAAHCwXwEGAEKACYCGwwWIQSpQNQ0mSwujpkQ PVAiT6fnzIKmZAUCZAUSmwUJDK5EZgAKCRAiT6fnzIKmZOJGEACOKABgo9wJXsbWhGWYO7mD 8R8mUyJHqbvaz+yTLnvRwfe/VwafFfDMx5GYVYzMY9TWpA8psFTKTUIIQmx2scYsRBUwm5VI EurRWKqENcDRjyo+ol59j0FViYysjQQeobXBDDE31t5SBg++veI6tXfpco/UiKEsDswL1WAr tEAZaruo7254TyH+gydURl2wJuzo/aZ7Y7PpqaODbYv727Dvm5eX64HCyyAH0s6sOCyGF5/p eIhrOn24oBf67KtdAN3H9JoFNUVTYJc1VJU3R1JtVdgwEdr+NEciEfYl0O19VpLE/PZxP4wX PWnhf5WjdoNI1Xec+RcJ5p/pSel0jnvBX8L2cmniYnmI883NhtGZsEWj++wyKiS4NranDFlA HdDM3b4lUth1pTtABKQ1YuTvehj7EfoWD3bv9kuGZGPrAeFNiHPdOT7DaXKeHpW9homgtBxj 8aX/UkSvEGJKUEbFL9cVa5tzyialGkSiZJNkWgeHe+jEcfRT6pJZOJidSCdzvJpbdJmm+eED w9XOLH1IIWh7RURU7G1iOfEfmImFeC3cbbS73LQEFGe1urxvIH5K/7vX+FkNcr9ujwWuPE9b 1C2o4i/yZPLXIVy387EjA6GZMqvQUFuSTs/GeBcv0NjIQi8867H3uLjz+mQy63fAitsDwLmR EP+ylKVEKb0Q2A== In-Reply-To: <20241028010818.2487581-2-andrii@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 8176B20006 X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: btx73mkmr6fqod9tka31onfjz6cuopqp X-HE-Tag: 1730202744-15051 X-HE-Meta: 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 cbrDhPYR 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 10/28/24 02:08, Andrii Nakryiko wrote: > From: Suren Baghdasaryan > > Convert mm_lock_seq to be seqcount_t and change all mmap_write_lock > variants to increment it, in-line with the usual seqcount usage pattern. > This lets us check whether the mmap_lock is write-locked by checking > mm_lock_seq.sequence counter (odd=locked, even=unlocked). This will be > used when implementing mmap_lock speculation functions. > As a result vm_lock_seq is also change to be unsigned to match the type > of mm_lock_seq.sequence. > > Suggested-by: Peter Zijlstra > Signed-off-by: Suren Baghdasaryan > Signed-off-by: Andrii Nakryiko Acked-by: Vlastimil Babka