svn commit: r234111 - stable/9/sys/kern
Adrian Chadd
adrian at FreeBSD.org
Tue Apr 10 21:23:28 UTC 2012
Author: adrian
Date: Tue Apr 10 21:23:28 2012
New Revision: 234111
URL: http://svn.freebsd.org/changeset/base/234111
Log:
MFC r226294 / r226793 from HEAD - Only call fixup_filename() when printing.
This reduces CPU overhead on lock-happy workloads when using WITNESS.
Modified:
stable/9/sys/kern/subr_witness.c (contents, props changed)
Modified: stable/9/sys/kern/subr_witness.c
==============================================================================
--- stable/9/sys/kern/subr_witness.c Tue Apr 10 19:47:44 2012 (r234110)
+++ stable/9/sys/kern/subr_witness.c Tue Apr 10 21:23:28 2012 (r234111)
@@ -719,6 +719,18 @@ static int witness_cold = 1;
*/
static int witness_spin_warn = 0;
+/* Trim useless garbage from filenames. */
+static const char *
+fixup_filename(const char *file)
+{
+
+ if (file == NULL)
+ return (NULL);
+ while (strncmp(file, "../", 3) == 0)
+ file += 3;
+ return (file);
+}
+
/*
* The WITNESS-enabled diagnostic code. Note that the witness code does
* assume that the early boot is single-threaded at least until after this
@@ -924,7 +936,7 @@ witness_ddb_display_descendants(int(*prn
}
w->w_displayed = 1;
if (w->w_file != NULL && w->w_line != 0)
- prnt(" -- last acquired @ %s:%d\n", w->w_file,
+ prnt(" -- last acquired @ %s:%d\n", fixup_filename(w->w_file),
w->w_line);
else
prnt(" -- never acquired\n");
@@ -990,18 +1002,6 @@ witness_ddb_display(int(*prnt)(const cha
}
#endif /* DDB */
-/* Trim useless garbage from filenames. */
-static const char *
-fixup_filename(const char *file)
-{
-
- if (file == NULL)
- return (NULL);
- while (strncmp(file, "../", 3) == 0)
- file += 3;
- return (file);
-}
-
int
witness_defineorder(struct lock_object *lock1, struct lock_object *lock2)
{
@@ -1053,7 +1053,6 @@ witness_checkorder(struct lock_object *l
w = lock->lo_witness;
class = LOCK_CLASS(lock);
td = curthread;
- file = fixup_filename(file);
if (class->lc_flags & LC_SLEEPLOCK) {
@@ -1064,7 +1063,8 @@ witness_checkorder(struct lock_object *l
*/
if (td->td_critnest != 0 && !kdb_active)
panic("blockable sleep lock (%s) %s @ %s:%d",
- class->lc_name, lock->lo_name, file, line);
+ class->lc_name, lock->lo_name,
+ fixup_filename(file), line);
/*
* If this is the first lock acquired then just return as
@@ -1102,17 +1102,19 @@ witness_checkorder(struct lock_object *l
if ((lock1->li_flags & LI_EXCLUSIVE) != 0 &&
(flags & LOP_EXCLUSIVE) == 0) {
printf("shared lock of (%s) %s @ %s:%d\n",
- class->lc_name, lock->lo_name, file, line);
+ class->lc_name, lock->lo_name,
+ fixup_filename(file), line);
printf("while exclusively locked from %s:%d\n",
- lock1->li_file, lock1->li_line);
+ fixup_filename(lock1->li_file), lock1->li_line);
panic("share->excl");
}
if ((lock1->li_flags & LI_EXCLUSIVE) == 0 &&
(flags & LOP_EXCLUSIVE) != 0) {
printf("exclusive lock of (%s) %s @ %s:%d\n",
- class->lc_name, lock->lo_name, file, line);
+ class->lc_name, lock->lo_name,
+ fixup_filename(file), line);
printf("while share locked from %s:%d\n",
- lock1->li_file, lock1->li_line);
+ fixup_filename(lock1->li_file), lock1->li_line);
panic("excl->share");
}
return;
@@ -1165,11 +1167,12 @@ witness_checkorder(struct lock_object *l
"acquiring duplicate lock of same type: \"%s\"\n",
w->w_name);
printf(" 1st %s @ %s:%d\n", plock->li_lock->lo_name,
- plock->li_file, plock->li_line);
- printf(" 2nd %s @ %s:%d\n", lock->lo_name, file, line);
+ fixup_filename(plock->li_file), plock->li_line);
+ printf(" 2nd %s @ %s:%d\n", lock->lo_name,
+ fixup_filename(file), line);
witness_debugger(1);
- } else
- mtx_unlock_spin(&w_mtx);
+ } else
+ mtx_unlock_spin(&w_mtx);
return;
}
mtx_assert(&w_mtx, MA_OWNED);
@@ -1307,19 +1310,24 @@ witness_checkorder(struct lock_object *l
if (i < 0) {
printf(" 1st %p %s (%s) @ %s:%d\n",
lock1->li_lock, lock1->li_lock->lo_name,
- w1->w_name, lock1->li_file, lock1->li_line);
+ w1->w_name, fixup_filename(lock1->li_file),
+ lock1->li_line);
printf(" 2nd %p %s (%s) @ %s:%d\n", lock,
- lock->lo_name, w->w_name, file, line);
+ lock->lo_name, w->w_name,
+ fixup_filename(file), line);
} else {
printf(" 1st %p %s (%s) @ %s:%d\n",
lock2->li_lock, lock2->li_lock->lo_name,
lock2->li_lock->lo_witness->w_name,
- lock2->li_file, lock2->li_line);
+ fixup_filename(lock2->li_file),
+ lock2->li_line);
printf(" 2nd %p %s (%s) @ %s:%d\n",
lock1->li_lock, lock1->li_lock->lo_name,
- w1->w_name, lock1->li_file, lock1->li_line);
+ w1->w_name, fixup_filename(lock1->li_file),
+ lock1->li_line);
printf(" 3rd %p %s (%s) @ %s:%d\n", lock,
- lock->lo_name, w->w_name, file, line);
+ lock->lo_name, w->w_name,
+ fixup_filename(file), line);
}
witness_debugger(1);
return;
@@ -1356,7 +1364,6 @@ witness_lock(struct lock_object *lock, i
return;
w = lock->lo_witness;
td = curthread;
- file = fixup_filename(file);
/* Determine lock list for this lock. */
if (LOCK_CLASS(lock)->lc_flags & LC_SLEEPLOCK)
@@ -1413,27 +1420,31 @@ witness_upgrade(struct lock_object *lock
if (lock->lo_witness == NULL || witness_watch == -1 || panicstr != NULL)
return;
class = LOCK_CLASS(lock);
- file = fixup_filename(file);
if (witness_watch) {
if ((lock->lo_flags & LO_UPGRADABLE) == 0)
panic("upgrade of non-upgradable lock (%s) %s @ %s:%d",
- class->lc_name, lock->lo_name, file, line);
+ class->lc_name, lock->lo_name,
+ fixup_filename(file), line);
if ((class->lc_flags & LC_SLEEPLOCK) == 0)
panic("upgrade of non-sleep lock (%s) %s @ %s:%d",
- class->lc_name, lock->lo_name, file, line);
+ class->lc_name, lock->lo_name,
+ fixup_filename(file), line);
}
instance = find_instance(curthread->td_sleeplocks, lock);
if (instance == NULL)
panic("upgrade of unlocked lock (%s) %s @ %s:%d",
- class->lc_name, lock->lo_name, file, line);
+ class->lc_name, lock->lo_name,
+ fixup_filename(file), line);
if (witness_watch) {
if ((instance->li_flags & LI_EXCLUSIVE) != 0)
panic("upgrade of exclusive lock (%s) %s @ %s:%d",
- class->lc_name, lock->lo_name, file, line);
+ class->lc_name, lock->lo_name,
+ fixup_filename(file), line);
if ((instance->li_flags & LI_RECURSEMASK) != 0)
panic("upgrade of recursed lock (%s) %s r=%d @ %s:%d",
class->lc_name, lock->lo_name,
- instance->li_flags & LI_RECURSEMASK, file, line);
+ instance->li_flags & LI_RECURSEMASK,
+ fixup_filename(file), line);
}
instance->li_flags |= LI_EXCLUSIVE;
}
@@ -1449,27 +1460,31 @@ witness_downgrade(struct lock_object *lo
if (lock->lo_witness == NULL || witness_watch == -1 || panicstr != NULL)
return;
class = LOCK_CLASS(lock);
- file = fixup_filename(file);
if (witness_watch) {
if ((lock->lo_flags & LO_UPGRADABLE) == 0)
panic("downgrade of non-upgradable lock (%s) %s @ %s:%d",
- class->lc_name, lock->lo_name, file, line);
+ class->lc_name, lock->lo_name,
+ fixup_filename(file), line);
if ((class->lc_flags & LC_SLEEPLOCK) == 0)
panic("downgrade of non-sleep lock (%s) %s @ %s:%d",
- class->lc_name, lock->lo_name, file, line);
+ class->lc_name, lock->lo_name,
+ fixup_filename(file), line);
}
instance = find_instance(curthread->td_sleeplocks, lock);
if (instance == NULL)
panic("downgrade of unlocked lock (%s) %s @ %s:%d",
- class->lc_name, lock->lo_name, file, line);
+ class->lc_name, lock->lo_name,
+ fixup_filename(file), line);
if (witness_watch) {
if ((instance->li_flags & LI_EXCLUSIVE) == 0)
panic("downgrade of shared lock (%s) %s @ %s:%d",
- class->lc_name, lock->lo_name, file, line);
+ class->lc_name, lock->lo_name,
+ fixup_filename(file), line);
if ((instance->li_flags & LI_RECURSEMASK) != 0)
panic("downgrade of recursed lock (%s) %s r=%d @ %s:%d",
class->lc_name, lock->lo_name,
- instance->li_flags & LI_RECURSEMASK, file, line);
+ instance->li_flags & LI_RECURSEMASK,
+ fixup_filename(file), line);
}
instance->li_flags &= ~LI_EXCLUSIVE;
}
@@ -1488,7 +1503,6 @@ witness_unlock(struct lock_object *lock,
return;
td = curthread;
class = LOCK_CLASS(lock);
- file = fixup_filename(file);
/* Find lock instance associated with this lock. */
if (class->lc_flags & LC_SLEEPLOCK)
@@ -1511,7 +1525,7 @@ witness_unlock(struct lock_object *lock,
*/
if (witness_watch > 0)
panic("lock (%s) %s not locked @ %s:%d", class->lc_name,
- lock->lo_name, file, line);
+ lock->lo_name, fixup_filename(file), line);
else
return;
found:
@@ -1520,16 +1534,17 @@ found:
if ((instance->li_flags & LI_EXCLUSIVE) != 0 && witness_watch > 0 &&
(flags & LOP_EXCLUSIVE) == 0) {
printf("shared unlock of (%s) %s @ %s:%d\n", class->lc_name,
- lock->lo_name, file, line);
+ lock->lo_name, fixup_filename(file), line);
printf("while exclusively locked from %s:%d\n",
- instance->li_file, instance->li_line);
+ fixup_filename(instance->li_file), instance->li_line);
panic("excl->ushare");
}
if ((instance->li_flags & LI_EXCLUSIVE) == 0 && witness_watch > 0 &&
(flags & LOP_EXCLUSIVE) != 0) {
printf("exclusive unlock of (%s) %s @ %s:%d\n", class->lc_name,
- lock->lo_name, file, line);
- printf("while share locked from %s:%d\n", instance->li_file,
+ lock->lo_name, fixup_filename(file), line);
+ printf("while share locked from %s:%d\n",
+ fixup_filename(instance->li_file),
instance->li_line);
panic("share->uexcl");
}
@@ -1544,7 +1559,7 @@ found:
/* The lock is now being dropped, check for NORELEASE flag */
if ((instance->li_flags & LI_NORELEASE) != 0 && witness_watch > 0) {
printf("forbidden unlock of (%s) %s @ %s:%d\n", class->lc_name,
- lock->lo_name, file, line);
+ lock->lo_name, fixup_filename(file), line);
panic("lock marked norelease");
}
@@ -2074,8 +2089,8 @@ witness_list_lock(struct lock_instance *
if (lock->lo_witness->w_name != lock->lo_name)
prnt(" (%s)", lock->lo_witness->w_name);
prnt(" r = %d (%p) locked @ %s:%d\n",
- instance->li_flags & LI_RECURSEMASK, lock, instance->li_file,
- instance->li_line);
+ instance->li_flags & LI_RECURSEMASK, lock,
+ fixup_filename(instance->li_file), instance->li_line);
}
#ifdef DDB
@@ -2211,12 +2226,12 @@ witness_assert(struct lock_object *lock,
panic("Lock (%s) %s is not sleep or spin!",
class->lc_name, lock->lo_name);
}
- file = fixup_filename(file);
switch (flags) {
case LA_UNLOCKED:
if (instance != NULL)
panic("Lock (%s) %s locked @ %s:%d.",
- class->lc_name, lock->lo_name, file, line);
+ class->lc_name, lock->lo_name,
+ fixup_filename(file), line);
break;
case LA_LOCKED:
case LA_LOCKED | LA_RECURSED:
@@ -2229,28 +2244,34 @@ witness_assert(struct lock_object *lock,
case LA_XLOCKED | LA_NOTRECURSED:
if (instance == NULL) {
panic("Lock (%s) %s not locked @ %s:%d.",
- class->lc_name, lock->lo_name, file, line);
+ class->lc_name, lock->lo_name,
+ fixup_filename(file), line);
break;
}
if ((flags & LA_XLOCKED) != 0 &&
(instance->li_flags & LI_EXCLUSIVE) == 0)
panic("Lock (%s) %s not exclusively locked @ %s:%d.",
- class->lc_name, lock->lo_name, file, line);
+ class->lc_name, lock->lo_name,
+ fixup_filename(file), line);
if ((flags & LA_SLOCKED) != 0 &&
(instance->li_flags & LI_EXCLUSIVE) != 0)
panic("Lock (%s) %s exclusively locked @ %s:%d.",
- class->lc_name, lock->lo_name, file, line);
+ class->lc_name, lock->lo_name,
+ fixup_filename(file), line);
if ((flags & LA_RECURSED) != 0 &&
(instance->li_flags & LI_RECURSEMASK) == 0)
panic("Lock (%s) %s not recursed @ %s:%d.",
- class->lc_name, lock->lo_name, file, line);
+ class->lc_name, lock->lo_name,
+ fixup_filename(file), line);
if ((flags & LA_NOTRECURSED) != 0 &&
(instance->li_flags & LI_RECURSEMASK) != 0)
panic("Lock (%s) %s recursed @ %s:%d.",
- class->lc_name, lock->lo_name, file, line);
+ class->lc_name, lock->lo_name,
+ fixup_filename(file), line);
break;
default:
- panic("Invalid lock assertion at %s:%d.", file, line);
+ panic("Invalid lock assertion at %s:%d.",
+ fixup_filename(file), line);
}
#endif /* INVARIANT_SUPPORT */
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