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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2015-07-02 11:55:40 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2015-07-22 15:27:42 -0700
commit3ad81779ad35cd2e2ab34ba3f47f6f485696a105 (patch)
tree9199ed5472dce8ac9e36bfc029579fee6cfa64cb /scripts
parent96a39bc434f94e213df43859fb8b01acda902634 (diff)
downloadop-kernel-dev-3ad81779ad35cd2e2ab34ba3f47f6f485696a105.zip
op-kernel-dev-3ad81779ad35cd2e2ab34ba3f47f6f485696a105.tar.gz
scripts: Make checkpatch.pl warn on expedited RCU grace periods
The synchronize_rcu_expedited() and synchronize_sched_expedited() expedited-grace-period primitives induce OS jitter, which can degrade real-time response. This commit therefore adds a checkpatch.pl warning on any patch adding them. Note that this patch does not warn on synchronize_srcu_expedited() because it does not induce OS jitter, courtesy of its otherwise much-maligned read-side memory barriers. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Andy Whitcroft <apw@canonical.com> Cc: Joe Perches <joe@perches.com>
Diffstat (limited to 'scripts')
-rwxr-xr-xscripts/checkpatch.pl19
1 files changed, 19 insertions, 0 deletions
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 90e1edc..976e711 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -5011,6 +5011,7 @@ sub process {
"memory barrier without comment\n" . $herecurr);
}
}
+
# check for waitqueue_active without a comment.
if ($line =~ /\bwaitqueue_active\s*\(/) {
if (!ctx_has_comment($first_line, $linenr)) {
@@ -5018,6 +5019,24 @@ sub process {
"waitqueue_active without comment\n" . $herecurr);
}
}
+
+# Check for expedited grace periods that interrupt non-idle non-nohz
+# online CPUs. These expedited can therefore degrade real-time response
+# if used carelessly, and should be avoided where not absolutely
+# needed. It is always OK to use synchronize_rcu_expedited() and
+# synchronize_sched_expedited() at boot time (before real-time applications
+# start) and in error situations where real-time response is compromised in
+# any case. Note that synchronize_srcu_expedited() does -not- interrupt
+# other CPUs, so don't warn on uses of synchronize_srcu_expedited().
+# Of course, nothing comes for free, and srcu_read_lock() and
+# srcu_read_unlock() do contain full memory barriers in payment for
+# synchronize_srcu_expedited() non-interruption properties.
+ if ($line =~ /\b(synchronize_rcu_expedited|synchronize_sched_expedited)\(/) {
+ WARN("EXPEDITED_RCU_GRACE_PERIOD",
+ "expedited RCU grace periods should be avoided where they can degrade real-time response\n" . $herecurr);
+
+ }
+
# check of hardware specific defines
if ($line =~ m@^.\s*\#\s*if.*\b(__i386__|__powerpc64__|__sun__|__s390x__)\b@ && $realfile !~ m@include/asm-@) {
CHK("ARCH_DEFINES",
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