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Code Issues Releases Activity

Don't check P_INMEM in kdb_thr_*().

Browse Source 
Not all debugger operations that enumerate threads require thread
stacks to be resident in memory to be useful.  Instead, push P_INMEM
checks (if needed) into callers.

Reviewed by:	kib
Sponsored by:	Netflix
Differential Revision:	https://reviews.freebsd.org/D27827
This commit is contained in:
John Baldwin 2020-12-31 16:01:12 -08:00
parent 9acce1c992
commit 825d234144
3 changed files with 16 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
sys/ddb/db_command.c
View File

@ -838,7 +838,10 @@ db_stack_trace(db_expr_t tid, bool hastid, db_expr_t count, char *modif)
else
pid = -1;
db_printf("Tracing pid %d tid %ld td %p\n", pid, (long)td->td_tid, td);
db_trace_thread(td, count);
if (td->td_proc != NULL && (td->td_proc->p_flag & P_INMEM) == 0)
db_printf("--- swapped out\n");
else
db_trace_thread(td, count);
}
static void

7
sys/ddb/db_thread.c
View File

@ -90,8 +90,11 @@ db_show_threads(db_expr_t addr, bool hasaddr, db_expr_t cnt, char *mod)
(void *)thr->td_kstack);
prev_jb = kdb_jmpbuf(jb);
if (setjmp(jb) == 0) {
if (db_trace_thread(thr, 1) != 0)
db_printf("***\n");
if (thr->td_proc->p_flag & P_INMEM) {
if (db_trace_thread(thr, 1) != 0)
db_printf("***\n");
} else
db_printf("*** swapped out\n");
}
kdb_jmpbuf(prev_jb);
thr = kdb_thr_next(thr);

15
sys/kern/subr_kdb.c
View File

@ -590,11 +590,9 @@ kdb_thr_first(void)
for (i = 0; i <= pidhash; i++) {
LIST_FOREACH(p, &pidhashtbl[i], p_hash) {
if (p->p_flag & P_INMEM) {
thr = FIRST_THREAD_IN_PROC(p);
if (thr != NULL)
return (thr);
}
thr = FIRST_THREAD_IN_PROC(p);
if (thr != NULL)
return (thr);
}
}
return (NULL);
@ -606,7 +604,7 @@ kdb_thr_from_pid(pid_t pid)
struct proc *p;
LIST_FOREACH(p, PIDHASH(pid), p_hash) {
if (p->p_flag & P_INMEM && p->p_pid == pid)
if (p->p_pid == pid)
return (FIRST_THREAD_IN_PROC(p));
}
return (NULL);
@ -641,8 +639,9 @@ kdb_thr_next(struct thread *thr)
return (NULL);
p = LIST_FIRST(&pidhashtbl[hash]);
}
if (p->p_flag & P_INMEM)
return (FIRST_THREAD_IN_PROC(p));
thr = FIRST_THREAD_IN_PROC(p);
if (thr != NULL)
return (thr);
}
}