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Don't pass a section cookie to CK for non-preemptible epoch sections.

Browse Source 
They're only useful when multiple threads may share an epoch record,
and that can't happen with non-preemptible sections.

Reviewed by:	mmacy
Differential Revision:	https://reviews.freebsd.org/D15507
This commit is contained in:
Mark Johnston 2018-05-21 16:03:51 +00:00
parent d01c1c8bfe
commit 13679ebac9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=333983
1 changed files with 5 additions and 12 deletions
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17
sys/kern/subr_epoch.c
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@ -298,18 +298,15 @@ void
epoch_enter(epoch_t epoch)
{
ck_epoch_record_t *record;
ck_epoch_section_t *section;
struct thread *td;
MPASS(cold || epoch != NULL);
section = NULL;
td = curthread;
critical_enter();
if (__predict_true(td->td_epochnest++ == 0))
section = (ck_epoch_section_t*)&td->td_epoch_section;
critical_enter();
td->td_epochnest++;
record = &epoch->e_pcpu[curcpu]->eps_record.er_record;
ck_epoch_begin(record, section);
ck_epoch_begin(record, NULL);
}
void
@ -339,16 +336,12 @@ void
epoch_exit(epoch_t epoch)
{
ck_epoch_record_t *record;
ck_epoch_section_t *section;
struct thread *td;
section = NULL;
td = curthread;
MPASS(td->td_critnest);
if (__predict_true(td->td_epochnest-- == 1))
section = (ck_epoch_section_t*)&td->td_epoch_section;
td->td_epochnest--;
record = &epoch->e_pcpu[curcpu]->eps_record.er_record;
ck_epoch_end(record, section);
ck_epoch_end(record, NULL);
critical_exit();
}