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livepatch,sched: Add livepatch task switching to cond_resched()

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There have been reports [1][2] of live patches failing to complete
within a reasonable amount of time due to CPU-bound kthreads.

Fix it by patching tasks in cond_resched().

There are four different flavors of cond_resched(), depending on the
kernel configuration.  Hook into all of them.

A more elegant solution might be to use a preempt notifier.  However,
non-ORC unwinders can't unwind a preempted task reliably.

[1] https://lore.kernel.org/lkml/20220507174628.2086373-1-song@kernel.org/
[2] https://lkml.kernel.org/lkml/20230120-vhost-klp-switching-v1-0-7c2b65519c43@kernel.org

Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Tested-by: Seth Forshee (DigitalOcean) <sforshee@kernel.org>
Link: https://lore.kernel.org/r/4ae981466b7814ec221014fc2554b2f86f3fb70b.1677257135.git.jpoimboe@kernel.org
This commit is contained in:
Josh Poimboeuf
2023-02-24 08:50:00 -08:00
committed by Peter Zijlstra
parent 383439d3d4
commit e3ff7c609f
6 changed files with 194 additions and 28 deletions
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1
include/linux/livepatch.h
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@@ -13,6 +13,7 @@
#include <linux/ftrace.h>
#include <linux/completion.h>
#include <linux/list.h>
#include <linux/livepatch_sched.h>
#if IS_ENABLED(CONFIG_LIVEPATCH)