From 97f0b8fdbebac3fd3398079d3db3cccb853eb0e7 Mon Sep 17 00:00:00 2001
From: Richard Frankel <rofrankel@google.com>
Date: Fri, 2 Dec 2016 13:46:40 -0500
Subject: [PATCH] Disable lockfile_create linear backoff.

Linear backoff causes very unfair behavior, in which the longer a
process has been waiting, the less likely it is to grab a contested
lock.

Remove the backoff and check once per second instead.
---
 lockfile.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/lockfile.c b/lockfile.c
index f571a67..e52f3e4 100644
--- a/lockfile.c
+++ b/lockfile.c
@@ -177,7 +177,7 @@ int lockfile_create(const char *lockfile, int retries, int flags)
 	char		sysname[256];
 	char		buf[8];
 	char		*p;
-	int		sleeptime = 0;
+	int		sleeptime = 1;
 	int		statfailed = 0;
 	int		fd;
 	int		i, e, len;
@@ -253,8 +253,10 @@ int lockfile_create(const char *lockfile, int retries, int flags)
 	for (i = 0; i < tries && tries > 0; i++) {
 
 		if (!dontsleep) {
-			sleeptime += 5;
-			if (sleeptime > 60) sleeptime = 60;
+			// GFiber modification:  Disable linear backoff, which causes very unfair
+			// behavior.
+			// sleeptime += 5;
+			// if (sleeptime > 60) sleeptime = 60;
 #ifdef LIB
 			sleep(sleeptime);
 #else
-- 
2.8.0.rc3.226.g39d4020