From: Ralph Campbell <rcampbell@nvidia.com>
To: Jason Gunthorpe <jgg@mellanox.com>,
Christoph Hellwig <hch@infradead.org>
Cc: "Juergen Gross" <jgross@suse.com>,
"David Zhou" <David1.Zhou@amd.com>,
"Mike Marciniszyn" <mike.marciniszyn@intel.com>,
"Stefano Stabellini" <sstabellini@kernel.org>,
"Philip Yang" <Philip.Yang@amd.com>,
"Oleksandr Andrushchenko" <oleksandr_andrushchenko@epam.com>,
"linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>,
"John Hubbard" <jhubbard@nvidia.com>,
"Felix.Kuehling@amd.com" <Felix.Kuehling@amd.com>,
"dri-devel@lists.freedesktop.org"
<dri-devel@lists.freedesktop.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"Jerome Glisse" <jglisse@redhat.com>,
"Dennis Dalessandro" <dennis.dalessandro@intel.com>,
"amd-gfx@lists.freedesktop.org" <amd-gfx@lists.freedesktop.org>,
"nouveau@lists.freedesktop.org" <nouveau@lists.freedesktop.org>,
"Alex Deucher" <alexander.deucher@amd.com>,
"xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
"Boris Ostrovsky" <boris.ostrovsky@oracle.com>,
"Petr Cvek" <petrcvekcz@gmail.com>,
"Christian König" <christian.koenig@amd.com>,
"Ben Skeggs" <bskeggs@redhat.com>
Subject: Re: [PATCH v3 02/14] mm/mmu_notifier: add an interval tree notifier
Date: Fri, 22 Nov 2019 16:54:08 -0800 [thread overview]
Message-ID: <cc5d4d76-df30-af7f-931c-eed8a7ada122@nvidia.com> (raw)
Message-ID: <20191123005408.m21JXBkwF0Ruu9EFfaN3Fro9AUQ5HoAL4ltloBDaeLA@z> (raw)
In-Reply-To: <20191113164620.GG21728@mellanox.com>
On 11/13/19 8:46 AM, Jason Gunthorpe wrote:
> On Wed, Nov 13, 2019 at 05:59:52AM -0800, Christoph Hellwig wrote:
>>> +int mmu_interval_notifier_insert(struct mmu_interval_notifier *mni,
>>> + struct mm_struct *mm, unsigned long start,
>>> + unsigned long length,
>>> + const struct mmu_interval_notifier_ops *ops);
>>> +int mmu_interval_notifier_insert_locked(
>>> + struct mmu_interval_notifier *mni, struct mm_struct *mm,
>>> + unsigned long start, unsigned long length,
>>> + const struct mmu_interval_notifier_ops *ops);
>>
>> Very inconsistent indentation between these two related functions.
>
> clang-format.. The kernel config is set to prefer a line up under the
> ( if all the arguments will fit within the 80 cols otherwise it does a
> 1 tab continuation indent.
>
>>> + /*
>>> + * The inv_end incorporates a deferred mechanism like
>>> + * rtnl_unlock(). Adds and removes are queued until the final inv_end
>>> + * happens then they are progressed. This arrangement for tree updates
>>> + * is used to avoid using a blocking lock during
>>> + * invalidate_range_start.
>>
>> Nitpick: That comment can be condensed into one less line:
>
> The rtnl_unlock can move up a line too. My editor is failing me on
> this.
>
>>> + /*
>>> + * TODO: Since we already have a spinlock above, this would be faster
>>> + * as wake_up_q
>>> + */
>>> + if (need_wake)
>>> + wake_up_all(&mmn_mm->wq);
>>
>> So why is this important enough for a TODO comment, but not important
>> enough to do right away?
>
> Lets drop the comment, I'm noto sure wake_up_q is even a function this
> layer should be calling.
Actually, I think you can remove the "need_wake" variable since it is
unconditionally set to "true".
Also, the comment in__mmu_interval_notifier_insert() says
"mni->mr_invalidate_seq" and I think that should be
"mni->invalidate_seq".
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next prev parent reply other threads:[~2019-11-23 0:54 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-12 20:22 [PATCH hmm v3 00/14] Consolidate the mmu notifier interval_tree and locking Jason Gunthorpe
2019-11-12 20:22 ` Jason Gunthorpe
2019-11-12 20:22 ` [PATCH v3 01/14] mm/mmu_notifier: define the header pre-processor parts even if disabled Jason Gunthorpe
2019-11-12 20:22 ` Jason Gunthorpe
2019-11-13 13:52 ` Christoph Hellwig
2019-11-13 13:52 ` Christoph Hellwig
2019-11-12 20:22 ` [PATCH v3 02/14] mm/mmu_notifier: add an interval tree notifier Jason Gunthorpe
2019-11-12 20:22 ` Jason Gunthorpe
2019-11-13 13:59 ` Christoph Hellwig
2019-11-13 13:59 ` Christoph Hellwig
2019-11-13 16:46 ` Jason Gunthorpe
2019-11-13 16:46 ` Jason Gunthorpe
2019-11-23 0:54 ` Ralph Campbell [this message]
2019-11-23 0:54 ` Ralph Campbell
2019-11-23 23:59 ` Jason Gunthorpe
2019-11-23 23:59 ` Jason Gunthorpe
2019-11-12 20:22 ` [PATCH v3 03/14] mm/hmm: allow hmm_range to be used with a mmu_interval_notifier or hmm_mirror Jason Gunthorpe
2019-11-12 20:22 ` Jason Gunthorpe
2019-11-13 14:00 ` Christoph Hellwig
2019-11-13 14:00 ` Christoph Hellwig
2019-11-12 20:22 ` [PATCH v3 04/14] mm/hmm: define the pre-processor related parts of hmm.h even if disabled Jason Gunthorpe
2019-11-12 20:22 ` Jason Gunthorpe
2019-11-13 14:01 ` Christoph Hellwig
2019-11-13 14:01 ` Christoph Hellwig
2019-11-12 20:22 ` [PATCH v3 05/14] RDMA/odp: Use mmu_interval_notifier_insert() Jason Gunthorpe
2019-11-12 20:22 ` Jason Gunthorpe
2019-11-12 20:22 ` [PATCH v3 06/14] RDMA/hfi1: Use mmu_interval_notifier_insert for user_exp_rcv Jason Gunthorpe
2019-11-12 20:22 ` Jason Gunthorpe
2019-11-12 20:22 ` [PATCH v3 07/14] drm/radeon: use mmu_interval_notifier_insert Jason Gunthorpe
2019-11-12 20:22 ` Jason Gunthorpe
2019-11-12 20:22 ` [PATCH v3 08/14] nouveau: use mmu_notifier directly for invalidate_range_start Jason Gunthorpe
2019-11-12 20:22 ` Jason Gunthorpe
2019-11-12 20:22 ` [PATCH v3 09/14] nouveau: use mmu_interval_notifier instead of hmm_mirror Jason Gunthorpe
2019-11-12 20:22 ` Jason Gunthorpe
2019-11-12 20:22 ` [PATCH v3 10/14] drm/amdgpu: Call find_vma under mmap_sem Jason Gunthorpe
2019-11-12 20:22 ` Jason Gunthorpe
2019-11-12 20:22 ` [PATCH v3 11/14] drm/amdgpu: Use mmu_interval_insert instead of hmm_mirror Jason Gunthorpe
2019-11-12 20:22 ` Jason Gunthorpe
2019-11-12 20:22 ` [PATCH v3 12/14] drm/amdgpu: Use mmu_interval_notifier " Jason Gunthorpe
2019-11-12 20:22 ` Jason Gunthorpe
2019-11-19 19:59 ` Philip Yang
2019-11-19 19:59 ` Philip Yang
2019-11-12 20:22 ` [PATCH v3 13/14] mm/hmm: remove hmm_mirror and related Jason Gunthorpe
2019-11-12 20:22 ` Jason Gunthorpe
2019-11-13 14:02 ` Christoph Hellwig
2019-11-13 14:02 ` Christoph Hellwig
2019-11-12 20:22 ` [PATCH v3 14/14] xen/gntdev: use mmu_interval_notifier_insert Jason Gunthorpe
2019-11-12 20:22 ` Jason Gunthorpe
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