From: Steven Rostedt <rostedt@goodmis.org>
To: Matthew Wilcox <willy@infradead.org>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>,
Ankur Arora <ankur.a.arora@oracle.com>,
linux-kernel@vger.kernel.org, tglx@linutronix.de,
peterz@infradead.org, torvalds@linux-foundation.org,
paulmck@kernel.org, linux-mm@kvack.org, x86@kernel.org,
akpm@linux-foundation.org, luto@kernel.org, bp@alien8.de,
dave.hansen@linux.intel.com, hpa@zytor.com, mingo@redhat.com,
juri.lelli@redhat.com, vincent.guittot@linaro.org,
mgorman@suse.de, jon.grimm@amd.com, bharata@amd.com,
raghavendra.kt@amd.com, boris.ostrovsky@oracle.com,
konrad.wilk@oracle.com, jgross@suse.com,
andrew.cooper3@citrix.com, mingo@kernel.org, bristot@kernel.org,
mathieu.desnoyers@efficios.com, geert@linux-m68k.org,
glaubitz@physik.fu-berlin.de, anton.ivanov@cambridgegreys.com,
mattst88@gmail.com, krypton@ulrich-teichert.org,
David.Laight@aculab.com, richard@nod.at, mjguzik@gmail.com,
Vignesh Raghavendra <vigneshr@ti.com>,
Kyungmin Park <kyungmin.park@samsung.com>,
Tudor Ambarus <tudor.ambarus@linaro.org>,
Pratyush Yadav <pratyush@kernel.org>
Subject: Re: [RFC PATCH 82/86] treewide: mtd: remove cond_resched()
Date: Wed, 8 Nov 2023 12:21:16 -0500 [thread overview]
Message-ID: <20231108122116.5e2c11be@gandalf.local.home> (raw)
In-Reply-To: <ZUu4JHLMwC4s7QvS@casper.infradead.org>
On Wed, 8 Nov 2023 16:32:36 +0000
Matthew Wilcox <willy@infradead.org> wrote:
> On Wed, Nov 08, 2023 at 05:28:27PM +0100, Miquel Raynal wrote:
> > > --- a/drivers/mtd/nand/raw/nand_legacy.c
> > > +++ b/drivers/mtd/nand/raw/nand_legacy.c
> > > @@ -203,7 +203,13 @@ void nand_wait_ready(struct nand_chip *chip)
> > > do {
> > > if (chip->legacy.dev_ready(chip))
> > > return;
> > > - cond_resched();
> > > + /*
> > > + * Use a cond_resched_stall() to avoid spinning in
> > > + * a tight loop.
> > > + * Though, given that the timeout is in milliseconds,
> > > + * maybe this should timeout or event wait?
> >
> > Event waiting is precisely what we do here, with the hardware access
> > which are available in this case. So I believe this part of the comment
> > (in general) is not relevant. Now regarding the timeout I believe it is
> > closer to the second than the millisecond, so timeout-ing is not
> > relevant either in most cases (talking about mtd/ in general).
>
> I think you've misunderstood what Ankur wrote here. What you're
> currently doing is spinning in a very tight loop. The comment is
> suggesting you might want to msleep(1) or something to avoid burning CPU
> cycles. It'd be even better if the hardware could signal you somehow,
> but I bet it can't.
>
Oh how I wish we could bring back the old PREEMPT_RT cpu_chill()...
#define cpu_chill() msleep(1)
;-)
-- Steve
> > > + */
> > > + cond_resched_stall();
> > > } while (time_before(jiffies, timeo));
> >
> > Thanks,
> > Miquèl
> >
next prev parent reply other threads:[~2023-11-08 17:21 UTC|newest]
Thread overview: 250+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-07 21:56 [RFC PATCH 00/86] Make the kernel preemptible Ankur Arora
2023-11-07 21:56 ` [RFC PATCH 01/86] Revert "riscv: support PREEMPT_DYNAMIC with static keys" Ankur Arora
2023-11-07 21:56 ` [RFC PATCH 02/86] Revert "sched/core: Make sched_dynamic_mutex static" Ankur Arora
2023-11-07 23:04 ` Steven Rostedt
2023-11-07 21:56 ` [RFC PATCH 03/86] Revert "ftrace: Use preemption model accessors for trace header printout" Ankur Arora
2023-11-07 23:10 ` Steven Rostedt
2023-11-07 23:23 ` Ankur Arora
2023-11-07 23:31 ` Steven Rostedt
2023-11-07 23:34 ` Steven Rostedt
2023-11-08 0:12 ` Ankur Arora
2023-11-07 21:56 ` [RFC PATCH 04/86] Revert "preempt/dynamic: Introduce preemption model accessors" Ankur Arora
2023-11-07 23:12 ` Steven Rostedt
2023-11-08 4:59 ` Ankur Arora
2023-11-07 21:56 ` [RFC PATCH 05/86] Revert "kcsan: Use " Ankur Arora
2023-11-07 21:56 ` [RFC PATCH 06/86] Revert "entry: Fix compile error in dynamic_irqentry_exit_cond_resched()" Ankur Arora
2023-11-08 7:47 ` Greg KH
2023-11-08 9:09 ` Ankur Arora
2023-11-08 10:00 ` Greg KH
2023-11-07 21:56 ` [RFC PATCH 07/86] Revert "livepatch,sched: Add livepatch task switching to cond_resched()" Ankur Arora
2023-11-07 23:16 ` Steven Rostedt
2023-11-08 4:55 ` Ankur Arora
2023-11-09 17:26 ` Josh Poimboeuf
2023-11-09 17:31 ` Steven Rostedt
2023-11-09 17:51 ` Josh Poimboeuf
2023-11-09 22:50 ` Ankur Arora
2023-11-09 23:47 ` Josh Poimboeuf
2023-11-10 0:46 ` Ankur Arora
2023-11-10 0:56 ` Steven Rostedt
2023-11-07 21:56 ` [RFC PATCH 08/86] Revert "arm64: Support PREEMPT_DYNAMIC" Ankur Arora
2023-11-07 23:17 ` Steven Rostedt
2023-11-08 15:44 ` Mark Rutland
2023-11-07 21:56 ` [RFC PATCH 09/86] Revert "sched/preempt: Add PREEMPT_DYNAMIC using static keys" Ankur Arora
2023-11-07 21:56 ` [RFC PATCH 10/86] Revert "sched/preempt: Decouple HAVE_PREEMPT_DYNAMIC from GENERIC_ENTRY" Ankur Arora
2023-11-07 21:56 ` [RFC PATCH 11/86] Revert "sched/preempt: Simplify irqentry_exit_cond_resched() callers" Ankur Arora
2023-11-07 21:56 ` [RFC PATCH 12/86] Revert "sched/preempt: Refactor sched_dynamic_update()" Ankur Arora
2023-11-07 21:56 ` [RFC PATCH 13/86] Revert "sched/preempt: Move PREEMPT_DYNAMIC logic later" Ankur Arora
2023-11-07 21:57 ` [RFC PATCH 14/86] Revert "preempt/dynamic: Fix setup_preempt_mode() return value" Ankur Arora
2023-11-07 23:20 ` Steven Rostedt
2023-11-07 21:57 ` [RFC PATCH 15/86] Revert "preempt: Restore preemption model selection configs" Ankur Arora
2023-11-07 21:57 ` [RFC PATCH 16/86] Revert "sched: Provide Kconfig support for default dynamic preempt mode" Ankur Arora
2023-11-07 21:57 ` [RFC PATCH 17/86] sched/preempt: remove PREEMPT_DYNAMIC from the build version Ankur Arora
2023-11-07 21:57 ` [RFC PATCH 18/86] Revert "preempt/dynamic: Fix typo in macro conditional statement" Ankur Arora
2023-11-07 21:57 ` [RFC PATCH 19/86] Revert "sched,preempt: Move preempt_dynamic to debug.c" Ankur Arora
2023-11-07 21:57 ` [RFC PATCH 20/86] Revert "static_call: Relax static_call_update() function argument type" Ankur Arora
2023-11-07 21:57 ` [RFC PATCH 21/86] Revert "sched/core: Use -EINVAL in sched_dynamic_mode()" Ankur Arora
2023-11-07 21:57 ` [RFC PATCH 22/86] Revert "sched/core: Stop using magic values " Ankur Arora
2023-11-07 21:57 ` [RFC PATCH 23/86] Revert "sched,x86: Allow !PREEMPT_DYNAMIC" Ankur Arora
2023-11-07 21:57 ` [RFC PATCH 24/86] Revert "sched: Harden PREEMPT_DYNAMIC" Ankur Arora
2023-11-07 21:57 ` [RFC PATCH 25/86] Revert "sched: Add /debug/sched_preempt" Ankur Arora
2023-11-07 21:57 ` [RFC PATCH 26/86] Revert "preempt/dynamic: Support dynamic preempt with preempt= boot option" Ankur Arora
2023-11-07 21:57 ` [RFC PATCH 27/86] Revert "preempt/dynamic: Provide irqentry_exit_cond_resched() static call" Ankur Arora
2023-11-07 21:57 ` [RFC PATCH 28/86] Revert "preempt/dynamic: Provide preempt_schedule[_notrace]() static calls" Ankur Arora
2023-11-07 21:57 ` [RFC PATCH 29/86] Revert "preempt/dynamic: Provide cond_resched() and might_resched() " Ankur Arora
2023-11-07 21:57 ` [RFC PATCH 30/86] Revert "preempt: Introduce CONFIG_PREEMPT_DYNAMIC" Ankur Arora
2023-11-07 21:57 ` [RFC PATCH 31/86] x86/thread_info: add TIF_NEED_RESCHED_LAZY Ankur Arora
2023-11-07 23:26 ` Steven Rostedt
2023-11-07 21:57 ` [RFC PATCH 32/86] entry: handle TIF_NEED_RESCHED_LAZY Ankur Arora
2023-11-07 21:57 ` [RFC PATCH 33/86] entry/kvm: " Ankur Arora
2023-11-07 21:57 ` [RFC PATCH 34/86] thread_info: accessors for TIF_NEED_RESCHED* Ankur Arora
2023-11-08 8:58 ` Peter Zijlstra
2023-11-21 5:59 ` Ankur Arora
2023-11-07 21:57 ` [RFC PATCH 35/86] thread_info: change to tif_need_resched(resched_t) Ankur Arora
2023-11-08 9:00 ` Peter Zijlstra
2023-11-07 21:57 ` [RFC PATCH 36/86] entry: irqentry_exit only preempts TIF_NEED_RESCHED Ankur Arora
2023-11-08 9:01 ` Peter Zijlstra
2023-11-21 6:00 ` Ankur Arora
2023-11-07 21:57 ` [RFC PATCH 37/86] sched: make test_*_tsk_thread_flag() return bool Ankur Arora
2023-11-08 9:02 ` Peter Zijlstra
2023-11-07 21:57 ` [RFC PATCH 38/86] sched: *_tsk_need_resched() now takes resched_t Ankur Arora
2023-11-08 9:03 ` Peter Zijlstra
2023-11-07 21:57 ` [RFC PATCH 39/86] sched: handle lazy resched in set_nr_*_polling() Ankur Arora
2023-11-08 9:15 ` Peter Zijlstra
2023-11-07 21:57 ` [RFC PATCH 40/86] context_tracking: add ct_state_cpu() Ankur Arora
2023-11-08 9:16 ` Peter Zijlstra
2023-11-21 6:32 ` Ankur Arora
2023-11-07 21:57 ` [RFC PATCH 41/86] sched: handle resched policy in resched_curr() Ankur Arora
2023-11-08 9:36 ` Peter Zijlstra
2023-11-08 10:26 ` Ankur Arora
2023-11-08 10:46 ` Peter Zijlstra
2023-11-21 6:34 ` Ankur Arora
2023-11-21 6:31 ` Ankur Arora
2023-11-07 21:57 ` [RFC PATCH 42/86] sched: force preemption on tick expiration Ankur Arora
2023-11-08 9:56 ` Peter Zijlstra
2023-11-21 6:44 ` Ankur Arora
2023-11-07 21:57 ` [RFC PATCH 43/86] sched: enable PREEMPT_COUNT, PREEMPTION for all preemption models Ankur Arora
2023-11-08 9:58 ` Peter Zijlstra
2023-11-07 21:57 ` [RFC PATCH 44/86] sched: voluntary preemption Ankur Arora
2023-11-07 21:57 ` [RFC PATCH 45/86] preempt: ARCH_NO_PREEMPT only preempts lazily Ankur Arora
2023-11-08 0:07 ` Steven Rostedt
2023-11-08 8:47 ` Ankur Arora
2023-11-07 21:57 ` [RFC PATCH 46/86] tracing: handle lazy resched Ankur Arora
2023-11-08 0:19 ` Steven Rostedt
2023-11-08 9:24 ` Ankur Arora
2023-11-07 21:57 ` [RFC PATCH 47/86] rcu: select PREEMPT_RCU if PREEMPT Ankur Arora
2023-11-08 0:27 ` Steven Rostedt
2023-11-21 0:28 ` Paul E. McKenney
2023-11-21 3:43 ` Steven Rostedt
2023-11-21 5:04 ` Paul E. McKenney
2023-11-21 5:39 ` Ankur Arora
2023-11-21 15:00 ` Steven Rostedt
2023-11-21 15:19 ` Paul E. McKenney
2023-11-28 10:53 ` Thomas Gleixner
2023-11-28 18:30 ` Ankur Arora
2023-12-05 1:03 ` Paul E. McKenney
2023-12-05 1:01 ` Paul E. McKenney
2023-12-05 15:01 ` Steven Rostedt
2023-12-05 19:38 ` Paul E. McKenney
2023-12-05 20:18 ` Ankur Arora
2023-12-06 4:07 ` Paul E. McKenney
2023-12-07 1:33 ` Ankur Arora
2023-12-05 20:45 ` Steven Rostedt
2023-12-06 10:08 ` David Laight
2023-12-07 4:34 ` Paul E. McKenney
2023-12-07 13:44 ` Steven Rostedt
2023-12-08 4:28 ` Paul E. McKenney
2023-11-08 12:15 ` Julian Anastasov
2023-11-07 21:57 ` [RFC PATCH 48/86] rcu: handle quiescent states for PREEMPT_RCU=n Ankur Arora
2023-11-21 0:38 ` Paul E. McKenney
2023-11-21 3:26 ` Ankur Arora
2023-11-21 5:17 ` Paul E. McKenney
2023-11-21 5:34 ` Paul E. McKenney
2023-11-21 6:13 ` Z qiang
2023-11-21 15:32 ` Paul E. McKenney
2023-11-21 19:25 ` Paul E. McKenney
2023-11-21 20:30 ` Peter Zijlstra
2023-11-21 21:14 ` Paul E. McKenney
2023-11-21 21:38 ` Steven Rostedt
2023-11-21 22:26 ` Paul E. McKenney
2023-11-21 22:52 ` Steven Rostedt
2023-11-22 0:01 ` Paul E. McKenney
2023-11-22 0:12 ` Steven Rostedt
2023-11-22 1:09 ` Paul E. McKenney
2023-11-28 17:04 ` Thomas Gleixner
2023-12-05 1:33 ` Paul E. McKenney
2023-12-06 15:10 ` Thomas Gleixner
2023-12-07 4:17 ` Paul E. McKenney
2023-12-07 1:31 ` Ankur Arora
2023-12-07 2:10 ` Steven Rostedt
2023-12-07 4:37 ` Paul E. McKenney
2023-12-07 14:22 ` Thomas Gleixner
2023-11-21 3:55 ` Z qiang
2023-11-07 21:57 ` [RFC PATCH 49/86] osnoise: handle quiescent states directly Ankur Arora
2023-11-07 21:57 ` [RFC PATCH 50/86] rcu: TASKS_RCU does not need to depend on PREEMPTION Ankur Arora
2023-11-21 0:38 ` Paul E. McKenney
2023-11-07 21:57 ` [RFC PATCH 51/86] preempt: disallow !PREEMPT_COUNT or !PREEMPTION Ankur Arora
2023-11-07 21:57 ` [RFC PATCH 52/86] sched: remove CONFIG_PREEMPTION from *_needbreak() Ankur Arora
2023-11-07 21:57 ` [RFC PATCH 53/86] sched: fixup __cond_resched_*() Ankur Arora
2023-11-07 21:57 ` [RFC PATCH 54/86] sched: add cond_resched_stall() Ankur Arora
2023-11-09 11:19 ` Thomas Gleixner
2023-11-09 22:27 ` Ankur Arora
2023-11-07 21:57 ` [RFC PATCH 55/86] xarray: add cond_resched_xas_rcu() and cond_resched_xas_lock_irq() Ankur Arora
2023-11-07 21:57 ` [RFC PATCH 56/86] xarray: use cond_resched_xas*() Ankur Arora
2023-11-07 23:01 ` [RFC PATCH 00/86] Make the kernel preemptible Steven Rostedt
2023-11-07 23:43 ` Ankur Arora
2023-11-08 0:00 ` Steven Rostedt
2023-11-07 23:07 ` [RFC PATCH 57/86] coccinelle: script to remove cond_resched() Ankur Arora
2023-11-07 23:07 ` [RFC PATCH 58/86] treewide: x86: " Ankur Arora
2023-11-07 23:07 ` [RFC PATCH 59/86] treewide: rcu: " Ankur Arora
2023-11-21 1:01 ` Paul E. McKenney
2023-11-07 23:07 ` [RFC PATCH 60/86] treewide: torture: " Ankur Arora
2023-11-21 1:02 ` Paul E. McKenney
2023-11-07 23:07 ` [RFC PATCH 61/86] treewide: bpf: " Ankur Arora
2023-11-07 23:07 ` [RFC PATCH 62/86] treewide: trace: " Ankur Arora
2023-11-07 23:07 ` [RFC PATCH 63/86] treewide: futex: " Ankur Arora
2023-11-07 23:08 ` [RFC PATCH 64/86] treewide: printk: " Ankur Arora
2023-11-07 23:08 ` [RFC PATCH 65/86] treewide: task_work: " Ankur Arora
2023-11-07 23:08 ` [RFC PATCH 66/86] treewide: kernel: " Ankur Arora
2023-11-17 18:14 ` Luis Chamberlain
2023-11-17 19:51 ` Steven Rostedt
2023-11-07 23:08 ` [RFC PATCH 67/86] treewide: kernel: remove cond_reshed() Ankur Arora
2023-11-07 23:08 ` [RFC PATCH 68/86] treewide: mm: remove cond_resched() Ankur Arora
2023-11-08 1:28 ` Sergey Senozhatsky
2023-11-08 7:49 ` Vlastimil Babka
2023-11-08 8:02 ` Yosry Ahmed
2023-11-08 8:54 ` Ankur Arora
2023-11-08 12:58 ` Matthew Wilcox
2023-11-08 14:50 ` Steven Rostedt
2023-11-07 23:08 ` [RFC PATCH 69/86] treewide: io_uring: " Ankur Arora
2023-11-07 23:08 ` [RFC PATCH 70/86] treewide: ipc: " Ankur Arora
2023-11-07 23:08 ` [RFC PATCH 71/86] treewide: lib: " Ankur Arora
2023-11-08 9:15 ` Herbert Xu
2023-11-08 15:08 ` Steven Rostedt
2023-11-09 4:19 ` Herbert Xu
2023-11-09 4:43 ` Steven Rostedt
2023-11-08 19:15 ` Kees Cook
2023-11-08 19:41 ` Steven Rostedt
2023-11-08 22:16 ` Kees Cook
2023-11-08 22:21 ` Steven Rostedt
2023-11-09 9:39 ` David Laight
2023-11-07 23:08 ` [RFC PATCH 72/86] treewide: crypto: " Ankur Arora
2023-11-07 23:08 ` [RFC PATCH 73/86] treewide: security: " Ankur Arora
2023-11-07 23:08 ` [RFC PATCH 74/86] treewide: fs: " Ankur Arora
2023-11-07 23:08 ` [RFC PATCH 75/86] treewide: virt: " Ankur Arora
2023-11-07 23:08 ` [RFC PATCH 76/86] treewide: block: " Ankur Arora
2023-11-07 23:08 ` [RFC PATCH 77/86] treewide: netfilter: " Ankur Arora
2023-11-07 23:08 ` [RFC PATCH 78/86] treewide: net: " Ankur Arora
2023-11-07 23:08 ` [RFC PATCH 79/86] " Ankur Arora
2023-11-08 12:16 ` Eric Dumazet
2023-11-08 17:11 ` Steven Rostedt
2023-11-08 20:59 ` Ankur Arora
2023-11-07 23:08 ` [RFC PATCH 80/86] treewide: sound: " Ankur Arora
2023-11-07 23:08 ` [RFC PATCH 81/86] treewide: md: " Ankur Arora
2023-11-07 23:08 ` [RFC PATCH 82/86] treewide: mtd: " Ankur Arora
2023-11-08 16:28 ` Miquel Raynal
2023-11-08 16:32 ` Matthew Wilcox
2023-11-08 17:21 ` Steven Rostedt [this message]
2023-11-09 8:38 ` Miquel Raynal
2023-11-07 23:08 ` [RFC PATCH 83/86] treewide: drm: " Ankur Arora
2023-11-07 23:08 ` [RFC PATCH 84/86] treewide: net: " Ankur Arora
2023-11-07 23:08 ` [RFC PATCH 85/86] treewide: drivers: " Ankur Arora
2023-11-08 0:48 ` Chris Packham
2023-11-09 0:55 ` Ankur Arora
2023-11-09 23:25 ` Dmitry Torokhov
2023-11-09 23:41 ` Steven Rostedt
2023-11-10 0:01 ` Ankur Arora
2023-11-07 23:08 ` [RFC PATCH 86/86] sched: " Ankur Arora
2023-11-07 23:19 ` [RFC PATCH 57/86] coccinelle: script to " Julia Lawall
2023-11-08 8:29 ` Ankur Arora
2023-11-08 9:49 ` Julia Lawall
2023-11-21 0:45 ` Paul E. McKenney
2023-11-21 5:16 ` Ankur Arora
2023-11-21 15:26 ` Paul E. McKenney
2023-11-08 4:08 ` [RFC PATCH 00/86] Make the kernel preemptible Christoph Lameter
2023-11-08 4:33 ` Ankur Arora
2023-11-08 4:52 ` Christoph Lameter
2023-11-08 5:12 ` Steven Rostedt
2023-11-08 6:49 ` Ankur Arora
2023-11-08 7:54 ` Vlastimil Babka
2023-11-08 7:31 ` Juergen Gross
2023-11-08 8:51 ` Peter Zijlstra
2023-11-08 9:53 ` Daniel Bristot de Oliveira
2023-11-08 10:04 ` Ankur Arora
2023-11-08 10:13 ` Peter Zijlstra
2023-11-08 11:00 ` Ankur Arora
2023-11-08 11:14 ` Peter Zijlstra
2023-11-08 12:16 ` Peter Zijlstra
2023-11-08 15:38 ` Thomas Gleixner
2023-11-08 16:15 ` Peter Zijlstra
2023-11-08 16:22 ` Steven Rostedt
2023-11-08 16:49 ` Peter Zijlstra
2023-11-08 17:18 ` Steven Rostedt
2023-11-08 20:46 ` Ankur Arora
2023-11-08 20:26 ` Ankur Arora
2023-11-08 9:43 ` David Laight
2023-11-08 15:15 ` Steven Rostedt
2023-11-08 16:29 ` David Laight
2023-11-08 16:33 ` Mark Rutland
2023-11-09 0:34 ` Ankur Arora
2023-11-09 11:00 ` Mark Rutland
2023-11-09 22:36 ` Ankur Arora
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