From: Byungchul Park <byungchul@sk•com>
To: Matthew Wilcox <willy@infradead•org>
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Subject: Re: [PATCH v17 44/47] dept: introduce APIs to set page usage and use subclasses_evt for the usage
Date: Thu, 20 Nov 2025 11:09:09 +0900 [thread overview]
Message-ID: <20251120020909.GA78650@system.software.com> (raw)
In-Reply-To: <aR3WHf9QZ_dizNun@casper.infradead.org>
On Wed, Nov 19, 2025 at 02:37:17PM +0000, Matthew Wilcox wrote:
> On Wed, Nov 19, 2025 at 07:53:12PM +0900, Byungchul Park wrote:
> > On Thu, Oct 02, 2025 at 05:12:44PM +0900, Byungchul Park wrote:
> > > False positive reports have been observed since dept works with the
> > > assumption that all the pages have the same dept class, but the class
> > > should be split since the problematic call paths are different depending
> > > on what the page is used for.
> > >
> > > At least, ones in block device's address_space and ones in regular
> > > file's address_space have exclusively different usages.
> > >
> > > Thus, define usage candidates like:
> > >
> > > DEPT_PAGE_REGFILE_CACHE /* page in regular file's address_space */
> > > DEPT_PAGE_BDEV_CACHE /* page in block device's address_space */
> > > DEPT_PAGE_DEFAULT /* the others */
> >
> > 1. I'd like to annotate a page to DEPT_PAGE_REGFILE_CACHE when the page
> > starts to be associated with a page cache for fs data.
> >
> > 2. And I'd like to annotate a page to DEPT_PAGE_BDEV_CACHE when the page
> > starts to be associated with meta data of fs e.g. super block.
> >
> > 3. Lastly, I'd like to reset the annotated value if any, that has been
> > set in the page, when the page ends the assoication with either page
> > cache or meta block of fs e.g. freeing the page.
> >
> > Can anyone suggest good places in code for the annotation 1, 2, 3? It'd
> > be totally appreciated. :-)
>
> I don't think it makes sense to track lock state in the page (nor
> folio). Partly bcause there's just so many of them, but also because
> the locking rules don't really apply to individual folios so much as
> they do to the mappings (or anon_vmas) that contain folios.
Thank you for the suggestion!
Since two folios associated to different mappings might appear in the
same callpath that usually be classified to a single class, I need to
think how to reflect the suggestion.
I guess you wanted to tell me a folio can only be associated to a single
mapping at once. Right? If so, sure, I should reflect it.
> If you're looking to find deadlock scenarios, I think it makes more
> sense to track all folio locks in a given mapping as the same lock
> type rather than track each folio's lock status.
>
> For example, let's suppose we did something like this in the
> page fault path:
>
> Look up and lock a folio (we need folios locked to insert them into
> the page tables to avoid a race with truncate)
> Try to allocate a page table
> Go into reclaim, attempt to reclaim a folio from this mapping
>
> We ought to detect that as a potential deadlock, regardless of which
> folio in the mapping we attempt to reclaim. So can we track folio
Did you mean 'regardless' for 'potential' detection, right?
> locking at the mapping/anon_vma level instead?
Piece of cake. Even though it may increase the number of DEPT classes,
I hope it will be okay. I just need to know the points in code where
folios start/end being associated to their specific mappings.
Byungchul
> ---
>
> My current understanding of folio locking rules:
>
> If you hold a lock on folio A, you can take a lock on folio B if:
>
> 1. A->mapping == B->mapping and A->index < B->index
> (for example writeback; we take locks on all folios to be written
> back in order)
> 2. !S_ISBLK(A->mapping->host) and S_ISBLK(B->mapping->host)
> 3. S_ISREG(A->mapping->host) and S_ISREG(B->mapping->host) with
> inode_lock() held on both and A->index < B->index
> (the remap_range code)
next prev parent reply other threads:[~2025-11-20 2:09 UTC|newest]
Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-02 8:12 [PATCH v17 00/47] DEPT(DEPendency Tracker) Byungchul Park
2025-10-02 8:12 ` [PATCH v17 01/47] llist: move llist_{head,node} definition to types.h Byungchul Park
2025-10-02 8:24 ` Greg KH
2025-10-02 13:53 ` Mathieu Desnoyers
2025-10-02 23:19 ` Arnd Bergmann
2025-10-16 0:46 ` Byungchul Park
2025-10-16 7:59 ` Arnd Bergmann
2025-10-16 0:38 ` Byungchul Park
2025-10-02 8:12 ` [PATCH v17 02/47] dept: implement DEPT(DEPendency Tracker) Byungchul Park
2025-10-02 8:25 ` Greg KH
2025-10-02 12:56 ` Geert Uytterhoeven
2025-10-02 8:12 ` [PATCH v17 03/47] dept: add single event dependency tracker APIs Byungchul Park
2025-10-02 8:12 ` [PATCH v17 04/47] dept: add lock " Byungchul Park
2025-10-02 8:12 ` [PATCH v17 05/47] dept: tie to lockdep and IRQ tracing Byungchul Park
2025-10-02 8:12 ` [PATCH v17 06/47] dept: add proc knobs to show stats and dependency graph Byungchul Park
2025-10-02 8:12 ` [PATCH v17 07/47] dept: distinguish each kernel context from another Byungchul Park
2025-10-02 8:12 ` [PATCH v17 08/47] x86_64, dept: add support CONFIG_ARCH_HAS_DEPT_SUPPORT to x86_64 Byungchul Park
2025-10-02 15:22 ` Dave Hansen
2025-10-03 1:12 ` Byungchul Park
2025-10-02 8:12 ` [PATCH v17 09/47] arm64, dept: add support CONFIG_ARCH_HAS_DEPT_SUPPORT to arm64 Byungchul Park
2025-10-02 11:39 ` Mark Brown
2025-10-03 1:46 ` Byungchul Park
2025-10-03 11:33 ` Mark Brown
2025-10-13 1:51 ` Byungchul Park
2025-10-03 14:36 ` Mark Rutland
2025-10-13 4:28 ` Byungchul Park
2025-10-02 8:12 ` [PATCH v17 10/47] dept: distinguish each work from another Byungchul Park
2025-10-02 8:12 ` [PATCH v17 11/47] dept: add a mechanism to refill the internal memory pools on running out Byungchul Park
2025-10-02 8:12 ` [PATCH v17 12/47] dept: record the latest one out of consecutive waits of the same class Byungchul Park
2025-10-02 8:12 ` [PATCH v17 13/47] dept: apply sdt_might_sleep_{start,end}() to wait_for_completion()/complete() Byungchul Park
2025-10-02 8:12 ` [PATCH v17 14/47] dept: apply sdt_might_sleep_{start,end}() to swait Byungchul Park
2025-10-02 8:12 ` [PATCH v17 15/47] dept: apply sdt_might_sleep_{start,end}() to waitqueue wait Byungchul Park
2025-10-02 8:12 ` [PATCH v17 16/47] dept: apply sdt_might_sleep_{start,end}() to hashed-waitqueue wait Byungchul Park
2025-10-02 8:12 ` [PATCH v17 17/47] dept: apply sdt_might_sleep_{start,end}() to dma fence Byungchul Park
2025-10-02 8:12 ` [PATCH v17 18/47] dept: track timeout waits separately with a new Kconfig Byungchul Park
2025-10-02 8:12 ` [PATCH v17 19/47] dept: apply timeout consideration to wait_for_completion()/complete() Byungchul Park
2025-10-02 8:12 ` [PATCH v17 20/47] dept: apply timeout consideration to swait Byungchul Park
2025-10-02 8:12 ` [PATCH v17 21/47] dept: apply timeout consideration to waitqueue wait Byungchul Park
2025-10-02 8:12 ` [PATCH v17 22/47] dept: apply timeout consideration to hashed-waitqueue wait Byungchul Park
2025-10-02 8:12 ` [PATCH v17 23/47] dept: apply timeout consideration to dma fence wait Byungchul Park
2025-10-02 8:12 ` [PATCH v17 24/47] dept: make dept able to work with an external wgen Byungchul Park
2025-10-02 8:12 ` [PATCH v17 25/47] dept: track PG_locked with dept Byungchul Park
2025-10-02 8:12 ` [PATCH v17 26/47] dept: print staged wait's stacktrace on report Byungchul Park
2025-10-02 8:12 ` [PATCH v17 27/47] locking/lockdep: prevent various lockdep assertions when lockdep_off()'ed Byungchul Park
2025-10-02 8:12 ` [PATCH v17 28/47] dept: add documentation for dept Byungchul Park
2025-10-03 2:44 ` Bagas Sanjaya
2025-10-13 1:28 ` Byungchul Park
2025-10-03 5:36 ` Jonathan Corbet
2025-10-13 1:03 ` Byungchul Park
2025-10-03 6:55 ` NeilBrown
2025-10-13 5:23 ` Byungchul Park
2025-10-14 6:03 ` NeilBrown
2025-10-14 6:38 ` Byungchul Park
2025-10-02 8:12 ` [PATCH v17 29/47] cpu/hotplug: use a weaker annotation in AP thread Byungchul Park
2025-10-02 8:12 ` [PATCH v17 30/47] fs/jbd2: use a weaker annotation in journal handling Byungchul Park
2025-10-02 8:40 ` Jan Kara
2025-10-03 1:13 ` Byungchul Park
2025-10-02 8:12 ` [PATCH v17 31/47] dept: assign dept map to mmu notifier invalidation synchronization Byungchul Park
2025-10-02 8:12 ` [PATCH v17 32/47] dept: assign unique dept_key to each distinct dma fence caller Byungchul Park
2025-10-02 8:12 ` [PATCH v17 33/47] dept: make dept aware of lockdep_set_lock_cmp_fn() annotation Byungchul Park
2025-10-02 8:12 ` [PATCH v17 34/47] dept: make dept stop from working on debug_locks_off() Byungchul Park
2025-10-02 8:12 ` [PATCH v17 35/47] i2c: rename wait_for_completion callback to wait_for_completion_cb Byungchul Park
2025-10-04 16:39 ` Wolfram Sang
2025-10-13 5:27 ` Byungchul Park
2025-10-02 8:12 ` [PATCH v17 36/47] dept: assign unique dept_key to each distinct wait_for_completion() caller Byungchul Park
2025-10-02 8:12 ` [PATCH v17 37/47] completion, dept: introduce init_completion_dmap() API Byungchul Park
2025-10-02 8:12 ` [PATCH v17 38/47] dept: introduce a new type of dependency tracking between multi event sites Byungchul Park
2025-10-02 8:12 ` [PATCH v17 39/47] dept: add module support for struct dept_event_site and dept_event_site_dep Byungchul Park
2025-10-02 8:12 ` [PATCH v17 40/47] dept: introduce event_site() to disable event tracking if it's recoverable Byungchul Park
2025-10-02 8:12 ` [PATCH v17 41/47] dept: implement a basic unit test for dept Byungchul Park
2025-10-02 8:12 ` [PATCH v17 42/47] dept: call dept_hardirqs_off() in local_irq_*() regardless of irq state Byungchul Park
2025-10-02 8:12 ` [PATCH v17 43/47] rcu/update: fix same dept key collision between various types of RCU Byungchul Park
2025-10-02 8:12 ` [PATCH v17 44/47] dept: introduce APIs to set page usage and use subclasses_evt for the usage Byungchul Park
2025-11-19 10:53 ` Byungchul Park
2025-11-19 14:37 ` Matthew Wilcox
2025-11-20 2:09 ` Byungchul Park [this message]
2025-11-20 2:34 ` Byungchul Park
2025-11-20 5:14 ` Byungchul Park
2025-12-01 7:18 ` Byungchul Park
2025-10-02 8:12 ` [PATCH v17 45/47] dept: track PG_writeback with dept Byungchul Park
2025-10-02 8:12 ` [PATCH v17 46/47] SUNRPC: relocate struct rcu_head to the first field of struct rpc_xprt Byungchul Park
2025-10-02 8:12 ` [PATCH v17 47/47] mm: percpu: increase PERCPU_DYNAMIC_SIZE_SHIFT on DEPT and large PAGE_SIZE Byungchul Park
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