Let top distinguish kernel time, explain in manpage.

diff --git a/commands/simple/top.c b/commands/simple/top.c
index ea67bf707b4bc00f2130e9aa0e309671638a9e3e..4b37bfdda901c9fb78fd1de753414682d2f470cc 100644 (file)
--- a/commands/simple/top.c
+++ b/commands/simple/top.c
@@ -110,7 +110,7 @@ void print_procs(int maxlines,
        struct mproc *mproc)
 {
        int p, nprocs;
-       int idleticks = 0;
+       int idleticks = 0, kernelticks = 0;
 
        for(p = nprocs = 0; p < PROCS; p++) {
                if(proc2[p].p_rts_flags & SLOT_FREE)
@@ -127,13 +127,19 @@ void print_procs(int maxlines,
                        idleticks = tick_procs[nprocs].ticks;
                        continue;
                }
+
+               /* Kernel task time, not counting IDLE */
+               if(proc2[p].p_nr < 0)
+                       kernelticks += tick_procs[nprocs].ticks;
                nprocs++;
        }
 
        qsort(tick_procs, nprocs, sizeof(tick_procs[0]), cmp_ticks);
 
-       printf("CPU states: %5.2f%% user, %5.2f%% idle\n\n",
-               100.0*(dt-idleticks)/dt, 100.0*idleticks/dt);
+       printf("CPU states: %5.2f%% user, %5.2f%% kernel, %5.2f%% idle\n\n",
+               100.0*(dt-idleticks-kernelticks)/dt,
+               100.0*(kernelticks)/dt,
+               100.0*idleticks/dt);
        maxlines -= 2;
 
        printf("  PID USERNAME PRI NICE   SIZE STATE   TIME    CPU COMMAND\n");

diff --git a/man/man1/top.1 b/man/man1/top.1
index 8edb744c2184a29004f877f7cfa78d79bc564e37..6f6abbb0769f3d2f81059ed9db80619d77aa3e64 100644 (file)
--- a/man/man1/top.1
+++ b/man/man1/top.1
@@ -1,20 +1,25 @@
 .TH TOP 1
 .SH NAME
-top \- show processes sorted by cpu usage
+top \- show processes sorted by CPU usage
 .SH SYNOPSIS
 .B top
 .SH DESCRIPTION
 Top displays a list of all running processes, once every update interval
-(currently 5 seconds). It is sorted by the cpu usage of the processes in
-the last interval. The first display is the cpu usage of processes since
+(currently 5 seconds). It is sorted by the CPU usage of the processes in
+the last interval. The first display is the CPU usage of processes since
 the boot time.
 
 At the top of the screen, top shows the current system load averages in
 the last 1-minute, 5-minute and 15-minute intervals. Then, over the
 last top interval it displays: the number of alive, active, and sleeping
-processes; memory free; and cpu usage.
+processes; memory free; and CPU usage. CPU usage is split into
+user, kernel and idle time. Kernel time is time spent by kernel tasks,
+that is tasks that run in kernel mode in kernel address space. User
+time is all other CPU time, including system processes such as servers
+and drivers, as top can't see the difference between a user process and
+a server or driver.
 
-Then it displays all the alive processes sorted by cpu usage in the last
+Then it displays all the alive processes sorted by CPU usage in the last
 interval, with a number of fields for every process. Currently the
 following fields are displayed:
 .PP
@@ -41,8 +46,8 @@ following fields are displayed:
   STATE
     RUN if the process is runnable, empty if blocking. 
   TIME
-    Total number of cpu time spent in the process itself. So-called
-    system time (cpu time spent on behalf of this process by another
+    Total number of CPU time spent in the process itself. So-called
+    system time (CPU time spent on behalf of this process by another
     process, generally a system process) is not seen here.
   CPU
     Percentage of time that the process was running in the last interval.
@@ -54,7 +59,7 @@ following fields are displayed:
 .SH BUGS
 This is a from-scratch reimplementation of top for MINIX 3.
 Many features (such as interactive commands) are not implemented.
-Sorting is only done by cpu usage currently. Displayed state is
+Sorting is only done by CPU usage currently. Displayed state is
 only RUN or empty.
 .SH AUTHOR
 Ben Gras (beng@few.vu.nl)