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The old thread priority must be stored as part of the EPOCH(9) tracker.

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Else recursive use of EPOCH(9) may cause the wrong priority to be restored.

Bump the __FreeBSD_version due to changing the thread and epoch tracker
structure.

Differential Revision:	https://reviews.freebsd.org/D30375
Reviewed by:	markj@
MFC after:	1 week
Sponsored by:	Mellanox Technologies // NVIDIA Networking
This commit is contained in:
Hans Petter Selasky 2021-05-21 10:27:20 +02:00
parent c50346bcf5
commit ef0f7ae934
4 changed files with 5 additions and 5 deletions
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6
sys/kern/subr_epoch.c
View File

@ -457,7 +457,7 @@ _epoch_enter_preempt(epoch_t epoch, epoch_tracker_t et EPOCH_FILE_LINE)
THREAD_NO_SLEEPING();
critical_enter();
sched_pin();
td->td_pre_epoch_prio = td->td_priority;
et->et_old_priority = td->td_priority;
er = epoch_currecord(epoch);
/* Record-level tracking is reserved for non-preemptible epochs. */
MPASS(er->er_td == NULL);
@ -510,8 +510,8 @@ _epoch_exit_preempt(epoch_t epoch, epoch_tracker_t et EPOCH_FILE_LINE)
ck_epoch_end(&er->er_record, &et->et_section);
TAILQ_REMOVE(&er->er_tdlist, et, et_link);
er->er_gen++;
if (__predict_false(td->td_pre_epoch_prio != td->td_priority))
epoch_adjust_prio(td, td->td_pre_epoch_prio);
if (__predict_false(et->et_old_priority != td->td_priority))
epoch_adjust_prio(td, et->et_old_priority);
critical_exit();
#ifdef EPOCH_TRACE
epoch_trace_exit(td, epoch, et, file, line);

1
sys/sys/epoch.h
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@ -55,6 +55,7 @@ struct epoch_tracker {
TAILQ_ENTRY(epoch_tracker) et_link;
struct thread *et_td;
ck_epoch_section_t et_section;
uint8_t et_old_priority;
#ifdef EPOCH_TRACE
struct epoch *et_epoch;
SLIST_ENTRY(epoch_tracker) et_tlink;

2
sys/sys/param.h
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@ -76,7 +76,7 @@
* cannot include sys/param.h and should only be updated here.
*/
#undef __FreeBSD_version
#define __FreeBSD_version 1400013
#define __FreeBSD_version 1400014
/*
* __FreeBSD_kernel__ indicates that this system uses the kernel of FreeBSD,

1
sys/sys/proc.h
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@ -325,7 +325,6 @@ struct thread {
u_char td_pri_class; /* (t) Scheduling class. */
u_char td_user_pri; /* (t) User pri from estcpu and nice. */
u_char td_base_user_pri; /* (t) Base user pri */
u_char td_pre_epoch_prio; /* (k) User pri on entry to epoch */
uintptr_t td_rb_list; /* (k) Robust list head. */
uintptr_t td_rbp_list; /* (k) Robust priv list head. */
uintptr_t td_rb_inact; /* (k) Current in-action mutex loc. */