From: Ben Gras <ben@minix3.org>
Date: Mon, 14 Nov 2005 15:58:07 +0000 (+0000)
Subject: getloadavg
X-Git-Tag: v3.1.2a~498
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/ddns-confgen.html?a=commitdiff_plain;h=f9c1f3172d3e1b5415627e1335960d2ce111d0d6;p=minix.git

getloadavg
---

diff --git a/include/minix/com.h b/include/minix/com.h
index e4bf92c88..850882610 100755
--- a/include/minix/com.h
+++ b/include/minix/com.h
@@ -325,6 +325,7 @@
 #   define GET_MACHINE 	  12	/* get machine information */
 #   define GET_LOCKTIMING 13	/* get lock()/unlock() latency timing */
 #   define GET_BIOSBUFFER 14	/* get a buffer for BIOS calls */
+#   define GET_LOADINFO   15	/* get load average information */
 #define I_PROC_NR      m7_i4	/* calling process */
 #define I_VAL_PTR      m7_p1	/* virtual address at caller */ 
 #define I_VAL_LEN      m7_i1	/* max length of value */
diff --git a/include/minix/syslib.h b/include/minix/syslib.h
index 4de6e077a..8317ea6f5 100755
--- a/include/minix/syslib.h
+++ b/include/minix/syslib.h
@@ -106,6 +106,7 @@ _PROTOTYPE(int sys_segctl, (int *index, u16_t *seg, vir_bytes *off,
 /* Shorthands for sys_getinfo() system call. */
 #define sys_getkmessages(dst)	sys_getinfo(GET_KMESSAGES, dst, 0,0,0)
 #define sys_getkinfo(dst)	sys_getinfo(GET_KINFO, dst, 0,0,0)
+#define sys_getloadinfo(dst)	sys_getinfo(GET_LOADINFO, dst, 0,0,0)
 #define sys_getmachine(dst)	sys_getinfo(GET_MACHINE, dst, 0,0,0)
 #define sys_getproctab(dst)	sys_getinfo(GET_PROCTAB, dst, 0,0,0)
 #define sys_getprivtab(dst)	sys_getinfo(GET_PRIVTAB, dst, 0,0,0)
diff --git a/include/minix/type.h b/include/minix/type.h
index a3aa7de54..8c2603356 100755
--- a/include/minix/type.h
+++ b/include/minix/type.h
@@ -107,6 +107,24 @@ struct kinfo {
   int relocking;		/* relocking check (for debugging) */
 };
 
+/* Load data accounted every this no. of seconds. */
+#define _LOAD_UNIT_SECS		 6 
+
+/* Load data history is kept for this long. */
+#define _LOAD_HISTORY_MINUTES	15
+#define _LOAD_HISTORY_SECONDS	(60*_LOAD_HISTORY_MINUTES)
+
+/* We need this many slots to store the load history. */
+#define _LOAD_HISTORY	(_LOAD_HISTORY_SECONDS/_LOAD_UNIT_SECS)
+
+/* Runnable processes and other load-average information. */
+struct loadinfo {
+  u16_t procs_enqueued;		/* current no. of runnable processes */
+  u16_t proc_load_history[_LOAD_HISTORY];	/* history of proc_s_cur */
+  u16_t proc_last_slot;
+  clock_t last_clock;
+};
+
 struct machine {
   int pc_at;
   int ps_mca;
diff --git a/include/stdlib.h b/include/stdlib.h
index 827a69164..670893f3c 100755
--- a/include/stdlib.h
+++ b/include/stdlib.h
@@ -71,6 +71,7 @@ _PROTOTYPE( char *initstate, (unsigned _seed, char *_state,
 _PROTOTYPE( long random, (void)						);
 _PROTOTYPE( char *setstate, (const char *state)				);
 _PROTOTYPE( void srandom, (unsigned seed)				);
+_PROTOTYPE( int getloadavg, (double *, int)				);
 #endif
 
 #ifdef _MINIX
diff --git a/include/unistd.h b/include/unistd.h
index f05e94add..c45f94500 100755
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -42,6 +42,7 @@
 #define SI_DMAP_TAB	   3	/* get device <-> driver mappings */
 #define SI_MEM_ALLOC	   4	/* get memory allocation data */
 #define SI_DATA_STORE	   5	/* get copy of data store */
+#define SI_LOADINFO	   6	/* get copy of load average structure */
 
 /* NULL must be defined in <unistd.h> according to POSIX Sec. 2.7.1. */
 #define NULL    ((void *)0)