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Date: Wed, 3 Nov 2021 18:58:32 +0000
From: Matthew Wilcox <willy@...radead.org>
To: Jimmy Shiu <jimmyshiu@...gle.com>
Cc: mingo@...hat.com, joaodias@...gle.com, wvw@...gle.com,
Minchan Kim <minchan@...gle.com>,
Will McVicker <willmcvicker@...gle.com>,
Peter Zijlstra <peterz@...radead.org>,
Juri Lelli <juri.lelli@...hat.com>,
Vincent Guittot <vincent.guittot@...aro.org>,
Dietmar Eggemann <dietmar.eggemann@....com>,
Steven Rostedt <rostedt@...dmis.org>,
Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
Daniel Bristot de Oliveira <bristot@...hat.com>,
Andrew Morton <akpm@...ux-foundation.org>,
David Howells <dhowells@...hat.com>,
Vlastimil Babka <vbabka@...e.cz>,
William Kucharski <william.kucharski@...cle.com>,
"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
Andreas Gruenbacher <agruenba@...hat.com>,
linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] SCHED: attribute page lock and waitqueue functions as
sched
On Thu, Nov 04, 2021 at 02:47:03AM +0800, Jimmy Shiu wrote:
> Bug: 144961676
> Bug: 144713689
> Bug: 172212772
A bug number is meaningless without knowing which bug tracker they
refer to. I suggest contemplating the meaning of the 'U' in URL.
> Signed-off-by: Minchan Kim <minchan@...gle.com>
> Signed-off-by: Jimmy Shiu <jimmyshiu@...gle.com>
> (cherry picked from commit 1e4de875d9e0cfaccf5131bcc709ae8646cdc168)
what tree is that commit ID in? I suggest it's meaningless and
should be removed.
> @@ -687,7 +688,7 @@ static inline void folio_lock(struct folio *folio)
> /*
> * lock_page may only be called if we have the page's inode pinned.
> */
> -static inline void lock_page(struct page *page)
> +static inline __sched void lock_page(struct page *page)
Why do you need to tag a static inline function as __sched? This would
be the only place where that is done.
> +++ b/kernel/sched/wait.c
> @@ -404,7 +404,8 @@ void finish_wait(struct wait_queue_head *wq_head, struct wait_queue_entry *wq_en
> }
> EXPORT_SYMBOL(finish_wait);
>
> -int autoremove_wake_function(struct wait_queue_entry *wq_entry, unsigned mode, int sync, void *key)
> +__sched int autoremove_wake_function(struct wait_queue_entry *wq_entry, unsigned int mode,
> + int sync, void *key)
> {
This function doesn't sleep. Why does it need to be tagged __sched?
> @@ -440,7 +441,7 @@ static inline bool is_kthread_should_stop(void)
> * } smp_mb(); // C
> * remove_wait_queue(&wq_head, &wait); wq_entry->flags |= WQ_FLAG_WOKEN;
> */
> -long wait_woken(struct wait_queue_entry *wq_entry, unsigned mode, long timeout)
> +__sched long wait_woken(struct wait_queue_entry *wq_entry, unsigned int mode, long timeout)
This one makes sense, but you've extended the length of the line past 80
columns, and it seems like it should be a separate patch with its own
justification.
> +__sched int woken_wake_function(struct wait_queue_entry *wq_entry, unsigned int mode,
> + int sync, void *key)
This doesn't seem to sleep either?
> +++ b/mm/filemap.c
> @@ -1271,7 +1271,7 @@ static inline bool folio_trylock_flag(struct folio *folio, int bit_nr,
> /* How many times do we accept lock stealing from under a waiter? */
> int sysctl_page_lock_unfairness = 5;
>
> -static inline int folio_wait_bit_common(struct folio *folio, int bit_nr,
> +static inline __sched int folio_wait_bit_common(struct folio *folio, int bit_nr,
> int state, enum behavior behavior)
> {
> wait_queue_head_t *q = folio_waitqueue(folio);
> @@ -1411,13 +1411,13 @@ static inline int folio_wait_bit_common(struct folio *folio, int bit_nr,
> return wait->flags & WQ_FLAG_WOKEN ? 0 : -EINTR;
> }
>
> -void folio_wait_bit(struct folio *folio, int bit_nr)
> +__sched void folio_wait_bit(struct folio *folio, int bit_nr)
> {
> folio_wait_bit_common(folio, bit_nr, TASK_UNINTERRUPTIBLE, SHARED);
> }
> EXPORT_SYMBOL(folio_wait_bit);
>
> -int folio_wait_bit_killable(struct folio *folio, int bit_nr)
> +__sched int folio_wait_bit_killable(struct folio *folio, int bit_nr)
> {
> return folio_wait_bit_common(folio, bit_nr, TASK_KILLABLE, SHARED);
> }
> @@ -1628,21 +1628,21 @@ EXPORT_SYMBOL_GPL(page_endio);
> * __folio_lock - Get a lock on the folio, assuming we need to sleep to get it.
> * @folio: The folio to lock
> */
> -void __folio_lock(struct folio *folio)
> +__sched void __folio_lock(struct folio *folio)
> {
> folio_wait_bit_common(folio, PG_locked, TASK_UNINTERRUPTIBLE,
> EXCLUSIVE);
> }
> EXPORT_SYMBOL(__folio_lock);
>
> -int __folio_lock_killable(struct folio *folio)
> +__sched int __folio_lock_killable(struct folio *folio)
> {
> return folio_wait_bit_common(folio, PG_locked, TASK_KILLABLE,
> EXCLUSIVE);
> }
> EXPORT_SYMBOL_GPL(__folio_lock_killable);
>
> -static int __folio_lock_async(struct folio *folio, struct wait_page_queue *wait)
> +static __sched int __folio_lock_async(struct folio *folio, struct wait_page_queue *wait)
> {
> struct wait_queue_head *q = folio_waitqueue(folio);
> int ret = 0;
> @@ -1679,7 +1679,7 @@ static int __folio_lock_async(struct folio *folio, struct wait_page_queue *wait)
> * If neither ALLOW_RETRY nor KILLABLE are set, will always return true
> * with the folio locked and the mmap_lock unperturbed.
> */
> -bool __folio_lock_or_retry(struct folio *folio, struct mm_struct *mm,
> +__sched bool __folio_lock_or_retry(struct folio *folio, struct mm_struct *mm,
> unsigned int flags)
> {
> if (fault_flag_allow_retry_first(flags)) {
> --
> 2.34.0.rc0.344.g81b53c2807-goog
>
>
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