From e33be771e4d9e5a88119f4e3af6259e01257c8a5 Mon Sep 17 00:00:00 2001
From: Dimitri Staessens <dimitri@ouroboros.rocks>
Date: Sun, 11 Jul 2021 14:01:15 +0200
Subject: ipcpd: Reduce Linux slack timer

This will reduce the linux high resolution slack timer in IPCPs. Linux
default for userspace processes is 50us. It is configurable at build
using IPCP_LINUX_SLACKTIMER_NS. Default is now 1us.

Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
---
 src/ipcpd/ipcp.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src/ipcpd/ipcp.c')

diff --git a/src/ipcpd/ipcp.c b/src/ipcpd/ipcp.c
index 59fbdba6..ab2f88f8 100644
--- a/src/ipcpd/ipcp.c
+++ b/src/ipcpd/ipcp.c
@@ -53,6 +53,7 @@
 #include <signal.h>
 #include <string.h>
 #include <sys/socket.h>
+#include <sys/prctl.h>
 #include <stdlib.h>
 #if defined(__linux__) && !defined(DISABLE_CORE_LOCK)
 #include <unistd.h>
@@ -710,6 +711,9 @@ int ipcp_init(int               argc,
         ipcpi.state     = IPCP_NULL;
         ipcpi.type      = type;
 
+#if defined (__linux__)
+        prctl(PR_SET_TIMERSLACK, IPCP_LINUX_SLACK_NS, 0, 0, 0);
+#endif
         ipcpi.sock_path = ipcp_sock_path(getpid());
         if (ipcpi.sock_path == NULL)
                 goto fail_sock_path;
-- 
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