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| author | Peter Zijlstra <peterz@infradead.org> | 2025-07-12 03:33:43 +0000 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2025-07-14 17:16:31 +0200 |
| commit | 44e4e0297c3c01987399bb9973f4d22a096a62c2 (patch) | |
| tree | d68407883f45f7ed7bf9230e96c960685e7ca583 /kernel/fork.c | |
| parent | sched: Add CONFIG_SCHED_PROXY_EXEC & boot argument to enable/disable (diff) | |
| download | linux-44e4e0297c3c01987399bb9973f4d22a096a62c2.tar.gz linux-44e4e0297c3c01987399bb9973f4d22a096a62c2.zip | |
locking/mutex: Rework task_struct::blocked_on
Track the blocked-on relation for mutexes, to allow following this
relation at schedule time.
task
| blocked-on
v
mutex
| owner
v
task
This all will be used for tracking blocked-task/mutex chains
with the prox-execution patch in a similar fashion to how
priority inheritance is done with rt_mutexes.
For serialization, blocked-on is only set by the task itself
(current). And both when setting or clearing (potentially by
others), is done while holding the mutex::wait_lock.
[minor changes while rebasing]
[jstultz: Fix blocked_on tracking in __mutex_lock_common in error paths]
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Juri Lelli <juri.lelli@redhat.com>
Signed-off-by: Connor O'Brien <connoro@google.com>
Signed-off-by: John Stultz <jstultz@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: K Prateek Nayak <kprateek.nayak@amd.com>
Link: https://lkml.kernel.org/r/20250712033407.2383110-3-jstultz@google.com
Diffstat (limited to 'kernel/fork.c')
| -rw-r--r-- | kernel/fork.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/kernel/fork.c b/kernel/fork.c index 1ee8eb11f38b..5f87f05aff4a 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -2123,9 +2123,8 @@ __latent_entropy struct task_struct *copy_process( lockdep_init_task(p); #endif -#ifdef CONFIG_DEBUG_MUTEXES p->blocked_on = NULL; /* not blocked yet */ -#endif + #ifdef CONFIG_BCACHE p->sequential_io = 0; p->sequential_io_avg = 0; |