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 X-Spam-Level: X-Spam-Status: No, score=-7.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 05095C433E2 for ; Tue, 23 Jun 2020 22:47:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D59A52078A for ; Tue, 23 Jun 2020 22:47:47 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="cq6eukdP" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388355AbgFWWrm (ORCPT ); Tue, 23 Jun 2020 18:47:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46742 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388379AbgFWWr2 (ORCPT ); Tue, 23 Jun 2020 18:47:28 -0400 Received: from mail-ot1-x344.google.com (mail-ot1-x344.google.com [IPv6:2607:f8b0:4864:20::344]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3B719C061260 for ; Tue, 23 Jun 2020 15:36:30 -0700 (PDT) Received: by mail-ot1-x344.google.com with SMTP id d4so82182otk.2 for ; Tue, 23 Jun 2020 15:36:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ffwll.ch; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=xlhH26wg9ZGqvZX4SsItfHEpKhp6TU8NjkKPjZVi7dM=; b=cq6eukdP9i43W25in3jOVQL/Rh6YqCJudgz63PRXIcpiyjXdYadDGIVAvDtcZes4/9 s4CZdktSYgbhNgC72a2mAW4N8hML0A/MmIipg4XJOKr2osYTgZMBnfvyxbXOKjJ4EuTM Gy3OAq85wO0Bl0ZpfYaesjQijNuCO2Y808qTY= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=xlhH26wg9ZGqvZX4SsItfHEpKhp6TU8NjkKPjZVi7dM=; b=DtJ8sA7x+ru3J1kJ6J765ZjU4Mr6iQYhrDQc0Esrrfq3TtbrimtBE27HjsD6MZgGJ+ c1jGWSapDutHE74OuyPvhePlq4WsW2TY3DhRQWxW6aqMJp9he7yZRWydmSCAUeeA2yaT VlIvAan2KNanTo1dao1AcAKZXoxU083RNfKwtd3/1nPTuj3NhZk5r3YeCHZhEsJZZ22D INuYPnn+3Vq4PwJ75Cse8IO0p2O/PerSIroXiLcrP+knCzgOBi4w7O3ha3jPENUZXgc4 R8LE+eq5SJetp/mkAO9Waw0yjvYn//Bo7Uj4FuTPOSMUCLE3T/N13MLlco8oQBte4nRZ n5sg== X-Gm-Message-State: AOAM530QpdhhuUni8s4qg8azA3n27L8Zue/ZNpwWci4k/A9jtMDeqCtU 40wAjIksfajmpAzmzAEyvDfVpm163kmcmSLiEWDKOw== X-Google-Smtp-Source: ABdhPJynJByw3qjza9aSaCWuruLjjJaTz6a/edqsdeAh4jWVsWvD+/9TBgrYezsnqUfbPYFHEHBWcHoh1sEG/Na3q0M= X-Received: by 2002:a05:6830:2017:: with SMTP id e23mr13025528otp.303.1592951789516; Tue, 23 Jun 2020 15:36:29 -0700 (PDT) MIME-Version: 1.0 References: <20200604081224.863494-2-daniel.vetter@ffwll.ch> <20200610194101.1668038-1-daniel.vetter@ffwll.ch> <20200621174205.GB1398@lca.pw> <20200623223134.GC2005@dread.disaster.area> In-Reply-To: <20200623223134.GC2005@dread.disaster.area> From: Daniel Vetter Date: Wed, 24 Jun 2020 00:36:18 +0200 Message-ID: Subject: Re: [PATCH] mm: Track mmu notifiers in fs_reclaim_acquire/release To: Dave Chinner Cc: Qian Cai , Intel Graphics Development , DRI Development , LKML , amd-gfx list , =?UTF-8?Q?Thomas_Hellstr=C3=B6m?= , Andrew Morton , Jason Gunthorpe , Linux MM , linux-rdma , Maarten Lankhorst , =?UTF-8?Q?Christian_K=C3=B6nig?= , Daniel Vetter , linux-xfs@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org On Wed, Jun 24, 2020 at 12:31 AM Dave Chinner wrote: > > On Sun, Jun 21, 2020 at 01:42:05PM -0400, Qian Cai wrote: > > On Wed, Jun 10, 2020 at 09:41:01PM +0200, Daniel Vetter wrote: > > > fs_reclaim_acquire/release nicely catch recursion issues when > > > allocating GFP_KERNEL memory against shrinkers (which gpu drivers ten= d > > > to use to keep the excessive caches in check). For mmu notifier > > > recursions we do have lockdep annotations since 23b68395c7c7 > > > ("mm/mmu_notifiers: add a lockdep map for invalidate_range_start/end"= ). > > > > > > But these only fire if a path actually results in some pte > > > invalidation - for most small allocations that's very rarely the case= . > > > The other trouble is that pte invalidation can happen any time when > > > __GFP_RECLAIM is set. Which means only really GFP_ATOMIC is a safe > > > choice, GFP_NOIO isn't good enough to avoid potential mmu notifier > > > recursion. > > > > > > I was pondering whether we should just do the general annotation, but > > > there's always the risk for false positives. Plus I'm assuming that > > > the core fs and io code is a lot better reviewed and tested than > > > random mmu notifier code in drivers. Hence why I decide to only > > > annotate for that specific case. > > > > > > Furthermore even if we'd create a lockdep map for direct reclaim, we'= d > > > still need to explicit pull in the mmu notifier map - there's a lot > > > more places that do pte invalidation than just direct reclaim, these > > > two contexts arent the same. > > > > > > Note that the mmu notifiers needing their own independent lockdep map > > > is also the reason we can't hold them from fs_reclaim_acquire to > > > fs_reclaim_release - it would nest with the acquistion in the pte > > > invalidation code, causing a lockdep splat. And we can't remove the > > > annotations from pte invalidation and all the other places since > > > they're called from many other places than page reclaim. Hence we can > > > only do the equivalent of might_lock, but on the raw lockdep map. > > > > > > With this we can also remove the lockdep priming added in 66204f1d2d1= b > > > ("mm/mmu_notifiers: prime lockdep") since the new annotations are > > > strictly more powerful. > > > > > > v2: Review from Thomas Hellstrom: > > > - unbotch the fs_reclaim context check, I accidentally inverted it, > > > but it didn't blow up because I inverted it immediately > > > - fix compiling for !CONFIG_MMU_NOTIFIER > > > > > > Cc: Thomas Hellstr=C3=B6m (Intel) > > > Cc: Andrew Morton > > > Cc: Jason Gunthorpe > > > Cc: linux-mm@kvack.org > > > Cc: linux-rdma@vger.kernel.org > > > Cc: Maarten Lankhorst > > > Cc: Christian K=C3=B6nig > > > Signed-off-by: Daniel Vetter > > > > Replying the right patch here... > > > > Reverting this commit [1] fixed the lockdep warning below while applyin= g > > some memory pressure. > > > > [1] linux-next cbf7c9d86d75 ("mm: track mmu notifiers in fs_reclaim_acq= uire/release") > > > > [ 190.455003][ T369] WARNING: possible circular locking dependency de= tected > > [ 190.487291][ T369] 5.8.0-rc1-next-20200621 #1 Not tainted > > [ 190.512363][ T369] ------------------------------------------------= ------ > > [ 190.543354][ T369] kswapd3/369 is trying to acquire lock: > > [ 190.568523][ T369] ffff889fcf694528 (&xfs_nondir_ilock_class){++++}= -{3:3}, at: xfs_reclaim_inode+0xdf/0x860 > > spin_lock at include/linux/spinlock.h:353 > > (inlined by) xfs_iflags_test_and_set at fs/xfs/xfs_inode.h:166 > > (inlined by) xfs_iflock_nowait at fs/xfs/xfs_inode.h:249 > > (inlined by) xfs_reclaim_inode at fs/xfs/xfs_icache.c:1127 > > [ 190.614359][ T369] > > [ 190.614359][ T369] but task is already holding lock: > > [ 190.647763][ T369] ffffffffb50ced00 (fs_reclaim){+.+.}-{0:0}, at: _= _fs_reclaim_acquire+0x0/0x30 > > __fs_reclaim_acquire at mm/page_alloc.c:4200 > > [ 190.687845][ T369] > > [ 190.687845][ T369] which lock already depends on the new lock. > > [ 190.687845][ T369] > > [ 190.734890][ T369] > > [ 190.734890][ T369] the existing dependency chain (in reverse order)= is: > > [ 190.775991][ T369] > > [ 190.775991][ T369] -> #1 (fs_reclaim){+.+.}-{0:0}: > > [ 190.808150][ T369] fs_reclaim_acquire+0x77/0x80 > > [ 190.832152][ T369] slab_pre_alloc_hook.constprop.52+0x20/0x1= 20 > > slab_pre_alloc_hook at mm/slab.h:507 > > [ 190.862173][ T369] kmem_cache_alloc+0x43/0x2a0 > > [ 190.885602][ T369] kmem_zone_alloc+0x113/0x3ef > > kmem_zone_alloc at fs/xfs/kmem.c:129 > > [ 190.908702][ T369] xfs_inode_item_init+0x1d/0xa0 > > xfs_inode_item_init at fs/xfs/xfs_inode_item.c:639 > > [ 190.934461][ T369] xfs_trans_ijoin+0x96/0x100 > > xfs_trans_ijoin at fs/xfs/libxfs/xfs_trans_inode.c:34 > > [ 190.961530][ T369] xfs_setattr_nonsize+0x1a6/0xcd0 > > OK, this patch has royally screwed something up if this path thinks > it can enter memory reclaim. This path is inside a transaction, so > it is running under PF_MEMALLOC_NOFS context, so should *never* > enter memory reclaim. > > I'd suggest that whatever mods were made to fs_reclaim_acquire by > this patch broke it's basic functionality.... > > > > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > > > index 13cc653122b7..7536faaaa0fd 100644 > > > --- a/mm/page_alloc.c > > > +++ b/mm/page_alloc.c > > > @@ -57,6 +57,7 @@ > > > #include > > > #include > > > #include > > > +#include > > > #include > > > #include > > > #include > > > @@ -4124,7 +4125,7 @@ should_compact_retry(struct alloc_context *ac, = unsigned int order, int alloc_fla > > > static struct lockdep_map __fs_reclaim_map =3D > > > STATIC_LOCKDEP_MAP_INIT("fs_reclaim", &__fs_reclaim_map); > > > > > > -static bool __need_fs_reclaim(gfp_t gfp_mask) > > > +static bool __need_reclaim(gfp_t gfp_mask) > > > { > > > gfp_mask =3D current_gfp_context(gfp_mask); > > This is applies the per-task memory allocation context flags to the > mask that is checked here. > > > > @@ -4136,10 +4137,6 @@ static bool __need_fs_reclaim(gfp_t gfp_mask) > > > if (current->flags & PF_MEMALLOC) > > > return false; > > > > > > - /* We're only interested __GFP_FS allocations for now */ > > > - if (!(gfp_mask & __GFP_FS)) > > > - return false; > > > - > > > if (gfp_mask & __GFP_NOLOCKDEP) > > > return false; > > > > > > @@ -4158,15 +4155,25 @@ void __fs_reclaim_release(void) > > > > > > void fs_reclaim_acquire(gfp_t gfp_mask) > > > { > > > - if (__need_fs_reclaim(gfp_mask)) > > > - __fs_reclaim_acquire(); > > > + if (__need_reclaim(gfp_mask)) { > > > + if (gfp_mask & __GFP_FS) > > > + __fs_reclaim_acquire(); > > .... and they have not been applied in this path. There's your > breakage. > > For future reference, please post anything that changes NOFS > allocation contexts or behaviours to linux-fsdevel, as filesystem > developers need to know about proposed changes to infrastructure > that is critical to the correct functioning of filesystems... Uh crap I totally missed that. Apologies for wasting everyone's time here. Andrew, please drop for now, I respin this thing. -Daniel --=20 Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch 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 X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 32D17C433E2 for ; Tue, 23 Jun 2020 22:36:34 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 08603208A9 for ; Tue, 23 Jun 2020 22:36:33 +0000 (UTC) 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Intel Graphics Development , LKML , amd-gfx list , =?UTF-8?Q?Christian_K=C3=B6nig?= , linux-xfs@vger.kernel.org, Linux MM , Jason Gunthorpe , Qian Cai , DRI Development , Daniel Vetter , Andrew Morton , =?UTF-8?Q?Thomas_Hellstr=C3=B6m?= Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" T24gV2VkLCBKdW4gMjQsIDIwMjAgYXQgMTI6MzEgQU0gRGF2ZSBDaGlubmVyIDxkYXZpZEBmcm9t b3JiaXQuY29tPiB3cm90ZToKPgo+IE9uIFN1biwgSnVuIDIxLCAyMDIwIGF0IDAxOjQyOjA1UE0g LTA0MDAsIFFpYW4gQ2FpIHdyb3RlOgo+ID4gT24gV2VkLCBKdW4gMTAsIDIwMjAgYXQgMDk6NDE6 MDFQTSArMDIwMCwgRGFuaWVsIFZldHRlciB3cm90ZToKPiA+ID4gZnNfcmVjbGFpbV9hY3F1aXJl L3JlbGVhc2UgbmljZWx5IGNhdGNoIHJlY3Vyc2lvbiBpc3N1ZXMgd2hlbgo+ID4gPiBhbGxvY2F0 aW5nIEdGUF9LRVJORUwgbWVtb3J5IGFnYWluc3Qgc2hyaW5rZXJzICh3aGljaCBncHUgZHJpdmVy cyB0ZW5kCj4gPiA+IHRvIHVzZSB0byBrZWVwIHRoZSBleGNlc3NpdmUgY2FjaGVzIGluIGNoZWNr KS4gRm9yIG1tdSBub3RpZmllcgo+ID4gPiByZWN1cnNpb25zIHdlIGRvIGhhdmUgbG9ja2RlcCBh 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<20200604081224.863494-2-daniel.vetter@ffwll.ch> <20200610194101.1668038-1-daniel.vetter@ffwll.ch> <20200621174205.GB1398@lca.pw> <20200623223134.GC2005@dread.disaster.area> In-Reply-To: <20200623223134.GC2005@dread.disaster.area> From: Daniel Vetter Date: Wed, 24 Jun 2020 00:36:18 +0200 Message-ID: To: Dave Chinner Subject: Re: [Intel-gfx] [PATCH] mm: Track mmu notifiers in fs_reclaim_acquire/release X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-rdma , Intel Graphics Development , LKML , amd-gfx list , =?UTF-8?Q?Christian_K=C3=B6nig?= , linux-xfs@vger.kernel.org, Linux MM , Jason Gunthorpe , Qian Cai , DRI Development , Daniel Vetter , Andrew Morton Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" 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Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 070A42078E for ; Tue, 23 Jun 2020 22:36:31 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="cq6eukdP" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 070A42078E Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ffwll.ch Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=amd-gfx-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 82AE66EA6F; Tue, 23 Jun 2020 22:36:31 +0000 (UTC) Received: from mail-ot1-x343.google.com (mail-ot1-x343.google.com [IPv6:2607:f8b0:4864:20::343]) by gabe.freedesktop.org (Postfix) with ESMTPS id 70EFE6EA70 for ; Tue, 23 Jun 2020 22:36:30 +0000 (UTC) Received: by mail-ot1-x343.google.com with SMTP id s13so57340otd.7 for ; Tue, 23 Jun 2020 15:36:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ffwll.ch; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=xlhH26wg9ZGqvZX4SsItfHEpKhp6TU8NjkKPjZVi7dM=; b=cq6eukdP9i43W25in3jOVQL/Rh6YqCJudgz63PRXIcpiyjXdYadDGIVAvDtcZes4/9 s4CZdktSYgbhNgC72a2mAW4N8hML0A/MmIipg4XJOKr2osYTgZMBnfvyxbXOKjJ4EuTM Gy3OAq85wO0Bl0ZpfYaesjQijNuCO2Y808qTY= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=xlhH26wg9ZGqvZX4SsItfHEpKhp6TU8NjkKPjZVi7dM=; b=oefmShUbp004XUX7dez7/c84l8G+bhdrpHYBMBW0NN6HuHz7Gx4MTzEx+yW4odHwnj s+wkFphbU0wyLIQX3sw28UwBbBiGYjQALH9BvueYkjcwqPVLfoEx03yBTab4eAS1/dBf ryvyYNNXNod/qlEViP+JQUxY+xN4emYnTrZcHd6w44JO1QqokZNlvqS0cDab5otVWVTW pBolezXMuxmow+FDx59lEAQvFwnDjF2IxultmHzPtJEu7JZn3xifto8Aehvk7ld1CFTU vcJVkR7fHXoB+IFtE4AmMgL/wcX4KzsuyIMIlp9ioZwlcdlCRYbBw054suwk3NFfAUBm hppQ== X-Gm-Message-State: AOAM532oQaRDNwQLWyrvr1gOf9W0gWL8PVsojVz32DT/Mf+np8SClXMi 64dOckzN9jnvW2v1R/RfO/gFoiSd/yrUw82tRU9XaQ== X-Google-Smtp-Source: ABdhPJynJByw3qjza9aSaCWuruLjjJaTz6a/edqsdeAh4jWVsWvD+/9TBgrYezsnqUfbPYFHEHBWcHoh1sEG/Na3q0M= X-Received: by 2002:a05:6830:2017:: with SMTP id e23mr13025528otp.303.1592951789516; Tue, 23 Jun 2020 15:36:29 -0700 (PDT) MIME-Version: 1.0 References: <20200604081224.863494-2-daniel.vetter@ffwll.ch> <20200610194101.1668038-1-daniel.vetter@ffwll.ch> <20200621174205.GB1398@lca.pw> <20200623223134.GC2005@dread.disaster.area> In-Reply-To: <20200623223134.GC2005@dread.disaster.area> From: Daniel Vetter Date: Wed, 24 Jun 2020 00:36:18 +0200 Message-ID: Subject: Re: [PATCH] mm: Track mmu notifiers in fs_reclaim_acquire/release To: Dave Chinner 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