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Rework the dynamic per-CPU stats code a bit. Always set 'statics->ncpus'

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to the maximum number of CPUs to ensure that lcpustates[] array is always
allocated to the maximum size.  Previously, if top was started without
per-CPU stats it would allocate a smaller lcpustates[] array.  When
per-CPU stats were then enabled, it would overflow the array and trash
the cpustates_columns[] array causing the CPU stats to be printed in the
wrong locations.

Approved by:	re (kib)
MFC after:	1 week
This commit is contained in:
John Baldwin 2011-07-18 21:15:47 +00:00
parent 834377fe2d
commit fcc3d62fa5
3 changed files with 18 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
contrib/top/display.c
View File

@ -156,18 +156,30 @@ int display_updatecpus(statics)
struct statics *statics;
{
register int *lp;
register int lines;
register int i;
/* call resize to do the dirty work */
lines = display_resize();
num_cpus = statics->ncpus;
if (pcpu_stats)
num_cpus = statics->ncpus;
else
num_cpus = 1;
cpustates_column = 5; /* CPU: */
if (num_cpus != 1)
cpustates_column += 2; /* CPU 0: */
for (i = num_cpus; i > 9; i /= 10)
cpustates_column++;
/* fill the "last" array with all -1s, to insure correct updating */
lp = lcpustates;
i = num_cpustates * num_cpus;
while (--i >= 0)
{
*lp++ = -1;
}
return(lines);
}
@ -197,7 +209,7 @@ struct statics *statics;
num_swap = string_count(swap_names);
lswap = (int *)malloc(num_swap * sizeof(int));
num_cpustates = string_count(cpustate_names);
lcpustates = (int *)malloc(num_cpustates * sizeof(int) * num_cpus);
lcpustates = (int *)malloc(num_cpustates * sizeof(int) * statics->ncpus);
cpustate_columns = (int *)malloc(num_cpustates * sizeof(int));
memory_names = statics->memory_names;

2
contrib/top/top.c
View File

@ -1094,7 +1094,7 @@ char *argv[];
new_message(MT_standout | MT_delayed,
" Displaying %sCPU statistics.",
pcpu_stats ? "per-" : "global ");
toggle_pcpustats(&statics);
toggle_pcpustats();
max_topn = display_updatecpus(&statics);
reset_display();
putchar('\r');

8
usr.bin/top/machine.c
View File

@ -241,7 +241,7 @@ static void getsysctl(const char *name, void *ptr, size_t len);
static int swapmode(int *retavail, int *retfree);
void
toggle_pcpustats(struct statics *statics)
toggle_pcpustats(void)
{
if (ncpus == 1)
@ -256,7 +256,6 @@ toggle_pcpustats(struct statics *statics)
y_header += ncpus - 1; /* 6 */
y_procs += ncpus - 1; /* 7 */
Header_lines += ncpus - 1; /* 7 */
statics->ncpus = ncpus;
} else {
y_mem = 3;
y_swap = 4;
@ -265,7 +264,6 @@ toggle_pcpustats(struct statics *statics)
y_header = 6;
y_procs = 7;
Header_lines = 7;
statics->ncpus = 1;
}
}
@ -356,10 +354,10 @@ machine_init(struct statics *statics, char do_unames)
pcpu_cp_old = calloc(1, size);
pcpu_cp_diff = calloc(1, size);
pcpu_cpu_states = calloc(1, size);
statics->ncpus = 1;
statics->ncpus = ncpus;
if (pcpu_stats)
toggle_pcpustats(statics);
toggle_pcpustats();
/* all done! */
return (0);