From: Ankur Arora <ankur.a.arora@oracle.com>
To: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: "Ankur Arora" <ankur.a.arora@oracle.com>,
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Subject: Re: [RFC PATCH 85/86] treewide: drivers: remove cond_resched()
Date: Thu, 09 Nov 2023 16:01:54 -0800 [thread overview]
Message-ID: <871qcybhn1.fsf@oracle.com> (raw)
In-Reply-To: <ZU1qgv1QNiSJFEOZ@google.com>
Dmitry Torokhov <dmitry.torokhov@gmail.com> writes:
> Hi Anhur,
>
> On Tue, Nov 07, 2023 at 03:08:21PM -0800, Ankur Arora wrote:
>> There are broadly three sets of uses of cond_resched():
>>
>> 1. Calls to cond_resched() out of the goodness of our heart,
>> otherwise known as avoiding lockup splats.
>
> ...
>
> What about RCU stalls? The calls to cond_resched() in evdev.c and
> mousedev.c were added specifically to allow RCU to run in cases when
> userspace passes a large buffer and the kernel is not fully preemptable.
Hi Dmitry
The short answer is that even if the kernel isn't fully preemptible, it
will always have preempt-count which means that RCU will always know
when a read-side critical section gets over.
Long version: cond_resched_rcu() is defined as:
static inline void cond_resched_rcu(void)
{
#if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU)
rcu_read_unlock();
cond_resched();
rcu_read_lock();
#endif
}
So the relevant case is PREEMPT_RCU=n.
Now, currently PREEMPT_RCU=n, also implies PREEMPT_COUNT=n. And so
the rcu_read_lock()/_unlock() reduce to a barrier. And, that's
why we need the explicit cond_resched() there.
The reason we can remove the cond_resched() after patch 43, and 47 is
because rcu_read_lock()/_unlock() will modify the preempt count and so
RCU will have visibility into when RCU read-side critical sections
finish.
That said, this series in this form isn't really going anywhere in the
short-term so none of this is imminent.
On the calls to cond_resched(), if the kernel is fully preemptible
they are a NOP. And then the code would be polling in a tight loop.
Would it make sense to do something like this instead?
if (!cond_resched())
msleep()/usleep()/cpu_relax();
--
ankur
next prev parent reply other threads:[~2023-11-10 0:07 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
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 [this message]
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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