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Employ thread_cow_synced in setrlimit

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In order to avoid proc lock/unlock on next kernel entry.
This commit is contained in:
Mateusz Guzik 2022-02-01 14:22:22 +01:00
parent 32114b639f
commit 93288e2445
1 changed files with 12 additions and 2 deletions
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14
sys/kern/kern_resource.c
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@ -656,7 +656,7 @@ int
kern_proc_setrlimit(struct thread *td, struct proc *p, u_int which,
struct rlimit *limp)
{
struct plimit *newlim, *oldlim;
struct plimit *newlim, *oldlim, *oldlim_td;
struct rlimit *alimp;
struct rlimit oldssiz;
int error;
@ -738,8 +738,18 @@ kern_proc_setrlimit(struct thread *td, struct proc *p, u_int which,
*alimp = *limp;
p->p_limit = newlim;
PROC_UPDATE_COW(p);
oldlim_td = NULL;
if (td == curthread && PROC_COW_CHANGECOUNT(td, p) == 1) {
oldlim_td = lim_cowsync();
thread_cow_synced(td);
}
PROC_UNLOCK(p);
lim_free(oldlim);
if (oldlim_td != NULL) {
MPASS(oldlim_td == oldlim);
lim_freen(oldlim, 2);
} else {
lim_free(oldlim);
}
if (which == RLIMIT_STACK &&
/*