From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg1-f197.google.com (mail-pg1-f197.google.com [209.85.215.197]) by kanga.kvack.org (Postfix) with ESMTP id 8DFA56B0003 for ; Wed, 11 Jul 2018 06:14:51 -0400 (EDT) Received: by mail-pg1-f197.google.com with SMTP id g5-v6so698284pgq.5 for ; Wed, 11 Jul 2018 03:14:51 -0700 (PDT) Received: from mail.kernel.org (mail.kernel.org. [198.145.29.99]) by mx.google.com with ESMTPS id a85-v6si21656826pfa.109.2018.07.11.03.14.50 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 11 Jul 2018 03:14:50 -0700 (PDT) Date: Wed, 11 Jul 2018 13:14:47 +0300 From: Leon Romanovsky Subject: Re: [RFC PATCH] mm, oom: distinguish blockable mode for mmu notifiers Message-ID: <20180711101447.GU3014@mtr-leonro.mtl.com> References: <20180622150242.16558-1-mhocko@kernel.org> <20180627074421.GF32348@dhcp22.suse.cz> <20180709122908.GJ22049@dhcp22.suse.cz> <20180710134040.GG3014@mtr-leonro.mtl.com> <20180710141410.GP14284@dhcp22.suse.cz> <20180710162020.GJ3014@mtr-leonro.mtl.com> <20180711090353.GD20050@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="bzuizT9vlVVqWfw+" Content-Disposition: inline In-Reply-To: <20180711090353.GD20050@dhcp22.suse.cz> Sender: owner-linux-mm@kvack.org List-ID: To: Michal Hocko Cc: LKML , "David (ChunMing) Zhou" , Paolo Bonzini , Radim =?utf-8?B?S3LEjW3DocWZ?= , Alex Deucher , Christian =?iso-8859-1?Q?K=F6nig?= , David Airlie , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Doug Ledford , Jason Gunthorpe , Mike Marciniszyn , Dennis Dalessandro , Sudeep Dutt , Ashutosh Dixit , Dimitri Sivanich , Boris Ostrovsky , Juergen Gross , =?iso-8859-1?B?Suly9G1l?= Glisse , Andrea Arcangeli , kvm@vger.kernel.org, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, linux-rdma@vger.kernel.org, xen-devel@lists.xenproject.org, linux-mm@kvack.org, David Rientjes , Felix Kuehling --bzuizT9vlVVqWfw+ Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Wed, Jul 11, 2018 at 11:03:53AM +0200, Michal Hocko wrote: > On Tue 10-07-18 19:20:20, Leon Romanovsky wrote: > > On Tue, Jul 10, 2018 at 04:14:10PM +0200, Michal Hocko wrote: > > > On Tue 10-07-18 16:40:40, Leon Romanovsky wrote: > > > > On Mon, Jul 09, 2018 at 02:29:08PM +0200, Michal Hocko wrote: > > > > > On Wed 27-06-18 09:44:21, Michal Hocko wrote: > > > > > > This is the v2 of RFC based on the feedback I've received so far. The > > > > > > code even compiles as a bonus ;) I haven't runtime tested it yet, mostly > > > > > > because I have no idea how. > > > > > > > > > > > > Any further feedback is highly appreciated of course. > > > > > > > > > > Any other feedback before I post this as non-RFC? > > > > > > > > From mlx5 perspective, who is primary user of umem_odp.c your change looks ok. > > > > > > Can I assume your Acked-by? > > > > I didn't have a chance to test it because it applies on our rdma-next, but > > fails to compile. > > What is the compilation problem? Is it caused by the patch or some other > unrelated changed? Thanks for pushing me to take a look on it. Your patch needs the following hunk to properly compile at least on my system. I'll take it to our regression. diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h index 369867501bed..1f364a157097 100644 --- a/include/linux/mmu_notifier.h +++ b/include/linux/mmu_notifier.h @@ -155,9 +155,9 @@ struct mmu_notifier_ops { * cannot block, mmu_notifier_ops.flags should have * MMU_INVALIDATE_DOES_NOT_BLOCK set. */ - void (*invalidate_range_start)(struct mmu_notifier *mn, + int (*invalidate_range_start)(struct mmu_notifier *mn, struct mm_struct *mm, - unsigned long start, unsigned long end); + unsigned long start, unsigned long end, bool blockable); void (*invalidate_range_end)(struct mmu_notifier *mn, struct mm_struct *mm, unsigned long start, unsigned long end); @@ -229,7 +229,7 @@ extern int __mmu_notifier_test_young(struct mm_struct *mm, unsigned long address); extern void __mmu_notifier_change_pte(struct mm_struct *mm, unsigned long address, pte_t pte); -extern void __mmu_notifier_invalidate_range_start(struct mm_struct *mm, +extern int __mmu_notifier_invalidate_range_start(struct mm_struct *mm, unsigned long start, unsigned long end, bool blockable); extern void __mmu_notifier_invalidate_range_end(struct mm_struct *mm, diff --git a/include/linux/oom.h b/include/linux/oom.h index 6adac113e96d..92f70e4c6252 100644 --- a/include/linux/oom.h +++ b/include/linux/oom.h @@ -95,7 +95,7 @@ static inline int check_stable_address_space(struct mm_struct *mm) return 0; } -void __oom_reap_task_mm(struct mm_struct *mm); +bool __oom_reap_task_mm(struct mm_struct *mm); extern unsigned long oom_badness(struct task_struct *p, struct mem_cgroup *memcg, const nodemask_t *nodemask, diff --git a/mm/oom_kill.c b/mm/oom_kill.c index 7e0c6e78ae5c..7c7bd6f3298e 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -1,6 +1,6 @@ /* * linux/mm/oom_kill.c - * + * * Copyright (C) 1998,2000 Rik van Riel * Thanks go out to Claus Fischer for some serious inspiration and * for goading me into coding this file... @@ -569,7 +569,7 @@ static bool oom_reap_task_mm(struct task_struct *tsk, struct mm_struct *mm) if (!__oom_reap_task_mm(mm)) { up_read(&mm->mmap_sem); ret = false; - goto out_unlock; + goto unlock_oom; } pr_info("oom_reaper: reaped process %d (%s), now anon-rss:%lukB, file-rss:%lukB, shmem-rss:%lukB\n", Thanks > -- > Michal Hocko > SUSE Labs --bzuizT9vlVVqWfw+ Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIcBAEBAgAGBQJbRdiXAAoJEORje4g2clinNPQP/jvfP8MeILcz9WT7kxNVX7c/ XpnkJcPys8ZjDS653gbzrRzw+nFz3sfqbSrvKb6MgCGfAGdanoHWjQsNbYz+Ci0m jr68xil3AoZsR30dolMGlCjHnsTq3CyJgNPfjm90VkuBV3huxGx52vSLuKBVVYuv qp+D/DwaxHKp9iUa4b5y8aXQYNCV++L3sNWgeUCXzaDvFm8WORW5PX/BxJ5a4M3r AFyJf0XIHfByd3mBDWJlo4c3mgAxV1hltesZHFCySPs4oLKRuHFiEap1BGNZsn8j m61eIRFoH5WVacvq1xHKs/oF9inuoaB9IzQsaeZan4YgOwthfcAibPxcdbcta29p IxYQUgjY+e3feJSOiHqFtujW8A3HpsuFUSPC7PHuJFJWqwCIcESxL3qeikBi2goA l5HIP6MMdKXv9PgXEsEFlPQJCS+ZsFk52pUOfneLve8t4MBWcuRXZpk0G0qfVLwq /2p9ES6m7Lroq7a0RkFZyWMmIdgBk9WjFbxm1ogXkMTWv7cQbmB94t0ut3fF6RCR lQfcHf16xm2IM4gNpzahFy4zsXWNWAdj/oVGDQjx3lu5LzvEriYptJZhKOx+lSdO lRO+pA/gzHWnbtA32swGX+MaHUNRAuVV8x1lbgRUq/aKwedg8BCpJXokrcpAasTt +En8/fnNQqxwKFdJw8j+ =6e5O -----END PGP SIGNATURE----- --bzuizT9vlVVqWfw+--