From: Alistair Popple <apopple@nvidia•com>
To: Christoph Hellwig <hch@lst•de>
Cc: linmiaohe@huawei•com, nvdimm@lists•linux.dev, jack@suse•cz,
david@redhat•com, djwong@kernel•org, dave.hansen@linux•intel.com,
david@fromorbit•com, peterx@redhat•com, linux-mm@kvack•org,
will@kernel•org, dave.jiang@intel•com, vishal.l.verma@intel•com,
linux-doc@vger•kernel.org, willy@infradead•org, jgg@ziepe•ca,
catalin.marinas@arm•com, linux-ext4@vger•kernel.org,
ira.weiny@intel•com, jhubbard@nvidia•com, npiggin@gmail•com,
linux-cxl@vger•kernel.org, bhelgaas@google•com,
dan.j.williams@intel•com, linux-arm-kernel@lists•infradead.org,
tytso@mit•edu, linuxppc-dev@lists•ozlabs.org,
linux-kernel@vger•kernel.org, linux-xfs@vger•kernel.org,
linux-fsdevel@vger•kernel.org, logang@deltatee•com
Subject: Re: [PATCH 04/13] fs/dax: Add dax_page_free callback
Date: Fri, 28 Jun 2024 09:48:24 +1000 [thread overview]
Message-ID: <87h6de54by.fsf@nvdebian.thelocal> (raw)
In-Reply-To: <20240627053343.GD14837@lst.de>
Christoph Hellwig <hch@lst•de> writes:
> On Thu, Jun 27, 2024 at 10:54:19AM +1000, Alistair Popple wrote:
>> When a fs dax page is freed it has to notify filesystems that the page
>> has been unpinned/unmapped and is free. Currently this involves
>> special code in the page free paths to detect a transition of refcount
>> from 2 to 1 and to call some fs dax specific code.
>>
>> A future change will require this to happen when the page refcount
>> drops to zero. In this case we can use the existing
>> pgmap->ops->page_free() callback so wire that up for all devices that
>> support FS DAX (nvdimm and virtio).
>
> Given that ->page_ffree is only called from free_zone_device_folio
> and right next to a switch on the the type, can't we just do the
> wake_up_var there without the somewhat confusing indirect call that
> just back in common code without any driver logic?
Longer term I'm hoping we can get rid of that switch on type entirely as
I don't think the whole get/put_dev_pagemap() thing is very useful. Less
indirection is good though so will move the wake_up_var there.
next prev parent reply other threads:[~2024-06-27 23:56 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-06-27 0:54 [PATCH 00/13] fs/dax: Fix FS DAX page reference counts Alistair Popple
2024-06-27 0:54 ` [PATCH 01/13] mm/gup.c: Remove redundant check for PCI P2PDMA page Alistair Popple
2024-06-27 6:36 ` Dan Williams
2024-06-27 0:54 ` [PATCH 02/13] pci/p2pdma: Don't initialise page refcount to one Alistair Popple
2024-06-27 5:30 ` Christoph Hellwig
2024-06-29 21:28 ` Bjorn Helgaas
2024-06-27 0:54 ` [PATCH 03/13] fs/dax: Refactor wait for dax idle page Alistair Popple
2024-06-27 5:31 ` Christoph Hellwig
2024-06-27 0:54 ` [PATCH 04/13] fs/dax: Add dax_page_free callback Alistair Popple
2024-06-27 5:33 ` Christoph Hellwig
2024-06-27 23:48 ` Alistair Popple [this message]
2024-06-27 0:54 ` [PATCH 05/13] mm: Allow compound zone device pages Alistair Popple
2024-06-27 5:35 ` Christoph Hellwig
2024-06-27 0:54 ` [PATCH 06/13] mm/memory: Add dax_insert_pfn Alistair Popple
2024-06-27 5:22 ` Christoph Hellwig
2024-06-27 11:33 ` Jan Kara
2024-09-06 6:21 ` Alistair Popple
2024-07-02 7:18 ` David Hildenbrand
2024-07-02 10:47 ` Alistair Popple
2024-07-02 11:46 ` Christoph Hellwig
2024-07-02 11:53 ` David Hildenbrand
2024-06-27 0:54 ` [PATCH 07/13] huge_memory: Allow mappings of PUD sized pages Alistair Popple
2024-06-27 22:26 ` kernel test robot
2024-07-02 7:16 ` David Hildenbrand
2024-07-02 10:19 ` Alistair Popple
2024-07-02 11:02 ` David Hildenbrand
2024-07-02 11:30 ` Alistair Popple
2024-07-02 13:01 ` David Hildenbrand
2024-07-02 11:51 ` Christoph Hellwig
2024-06-27 0:54 ` [PATCH 08/13] huge_memory: Allow mappings of PMD " Alistair Popple
2024-06-27 0:54 ` [PATCH 09/13] gup: Don't allow FOLL_LONGTERM pinning of FS DAX pages Alistair Popple
2024-07-01 8:59 ` David Hildenbrand
2024-07-01 23:47 ` Alistair Popple
2024-07-02 10:48 ` David Hildenbrand
2024-06-27 0:54 ` [PATCH 10/13] fs/dax: Properly refcount fs dax pages Alistair Popple
2024-06-27 5:44 ` Christoph Hellwig
2024-09-06 6:00 ` Alistair Popple
2024-06-27 0:54 ` [PATCH 11/13] huge_memory: Remove dead vmf_insert_pXd code Alistair Popple
2024-07-05 14:24 ` Peter Xu
2024-07-09 4:07 ` Alistair Popple
2024-07-09 15:56 ` Peter Xu
2024-07-12 2:40 ` Alistair Popple
2024-07-12 15:52 ` Peter Xu
2024-06-27 0:54 ` [PATCH 12/13] mm: Remove pXX_devmap callers Alistair Popple
2024-06-27 0:54 ` [PATCH 13/13] mm: Remove devmap related functions and page table bits Alistair Popple
2024-06-27 23:04 ` kernel test robot
2024-06-28 2:12 ` kernel test robot
2024-07-08 11:35 ` Will Deacon
2024-06-27 6:58 ` [PATCH 00/13] fs/dax: Fix FS DAX page reference counts Dan Williams
2024-06-27 7:15 ` Alistair Popple
2024-06-27 20:24 ` Dan Williams
2024-06-28 0:06 ` Alistair Popple
2024-07-01 4:24 ` Dave Chinner
2024-07-01 8:33 ` Alistair Popple
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