Store debug info for likely blocking syscalls
These calls block all the time and weren't easily visible in "db sem".
Signed-off-by: Barret Rhoden <brho@cs.berkeley.edu>
diff --git a/kern/src/syscall.c b/kern/src/syscall.c
index 2673eb5..43ce692 100644
--- a/kern/src/syscall.c
+++ b/kern/src/syscall.c
@@ -467,6 +467,7 @@
* async I/O handling. */
static int sys_block(struct proc *p, unsigned int usec)
{
+ sysc_save_str("block for %d usec", usec);
/* Note printing takes a few ms, so your printds won't be perfect. */
printd("[kernel] sys_block(), sleeping at %llu\n", read_tsc());
kthread_usleep(usec);
@@ -521,6 +522,7 @@
poperror();
return -1;
}
+ sysc_save_str("nanosleep for %d usec", usec);
kthread_usleep(usec);
poperror();
return 0;
@@ -1189,6 +1191,7 @@
pid_t retval = 0;
int ret_status = 0;
+ sysc_save_str("waitpid on %d", pid);
/* -1 is the signal for 'any child' */
if (pid == -1) {
retval = wait_any(parent, &ret_status, options);
