slabtop: Check for bad d and o option combination
If you run slabtop with the -d option and then -o option the delay gets set to zero and it runs forever. slabtop now checks for this combination and errors. Adding a DEJAGNU test also found that none of the slabtop checks were running so they got added to the list and only the ones that need /proc/slabinfo (if not readable) are skipped. References: #160
This commit is contained in:
Craig Small
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15c8b8e2cf
commit
2e1e8fcc85
1
NEWS
1
NEWS
@ -3,6 +3,7 @@ procps-ng-NEXT
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* Rename pwait to pidwait
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* library: renamed to libproc-2 and reset to 0:0:0
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* ps: Add OOM and OOMADJ fields issue #198
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* slabtop: Don't combine d and o options issue #160
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procps-ng-3.3.17
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---------------
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@ -2,7 +2,7 @@
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.\"
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.\" Copyright (C) 2003 Chris Rivera
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.\" Licensed under the terms of the GNU Library General Public License, v2
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.TH SLABTOP "1" "June 2011" "procps-ng" "User Commands"
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.TH SLABTOP "1" "2021-03-11" "procps-ng" "User Commands"
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.SH NAME
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slabtop \- display kernel slab cache information in real time
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.SH SYNOPSIS
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@ -25,7 +25,8 @@ Refresh the display every
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in seconds. By default,
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.B slabtop
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refreshes the display every three seconds. To exit the program, hit
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.BR q.
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.BR q .
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This cannot be combined with the \fB-o\fR option.
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.TP
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\fB\-s\fR, \fB\-\-sort\fR=\fIS\fR
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Sort by \fIS\fR, where \fIS\fR is one of the sort criteria.
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10
slabtop.c
10
slabtop.c
@ -48,10 +48,11 @@
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#define DEFAULT_SORT SLAB_NUM_OBJS
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#define CHAINS_ALLOC 150
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#define MAXTBL(t) (int)( sizeof(t) / sizeof(t[0]) )
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#define DEFAULT_DELAY 3
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static unsigned short Cols, Rows;
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static struct termios Saved_tty;
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static long Delay = 3;
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static long Delay = 0;
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static int Run_once = 0;
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static struct slabinfo_info *Slab_info;
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@ -181,6 +182,8 @@ static void parse_opts (int argc, char **argv)
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while ((o = getopt_long(argc, argv, "d:s:ohV", longopts, NULL)) != -1) {
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switch (o) {
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case 'd':
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if (Run_once)
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xerrx(EXIT_FAILURE, _("Cannot combine -d and -o options"));
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errno = 0;
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Delay = strtol_or_err(optarg, _("illegal delay"));
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if (Delay < 1)
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@ -190,8 +193,9 @@ static void parse_opts (int argc, char **argv)
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set_sort_stuff(optarg[0]);
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break;
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case 'o':
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if (Delay != 0)
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xerrx(EXIT_FAILURE, _("Cannot combine -d and -o options"));
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Run_once=1;
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Delay = 0;
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break;
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case 'V':
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printf(PROCPS_NG_VERSION);
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@ -204,6 +208,8 @@ static void parse_opts (int argc, char **argv)
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}
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if (optind != argc)
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usage(stderr);
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if (!Run_once && Delay == 0)
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Delay = DEFAULT_DELAY;
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}
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static void print_summary (void)
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@ -31,6 +31,7 @@ DEJATOOL += \
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pkill \
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ps \
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pwdx \
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slabtop \
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uptime \
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vmstat \
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w
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@ -51,6 +52,7 @@ EXTRA_DIST = \
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ps.test/ps_personality.exp \
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ps.test/ps_sched_batch.exp \
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pwdx.test/pwdx.exp \
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slabtop.test/slabtop.exp \
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uptime.test/uptime.exp \
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vmstat.test/vmstat.exp \
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w.test/w.exp
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@ -7,15 +7,20 @@ set avst "Active / Total"
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set used "\\\(% used\\\)\\s+:"
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set pct "\\\(\\d+\\.\\d+%\\\)"
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if { [ file readable "/proc/slabinfo" ] == 0 } {
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unsupported "slabtop tests disabled as /proc/slabinfo is unreadable"
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} else {
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set slabtop_header "^ $avst Objects $used \\d+ / \\d+ ${pct}\\s+$avst Slabs $used \\d+ / \\d+ ${pct}\\s+$avst Caches $used \\d+ / \\d+ ${pct}\\s+$avst Size $used \\d+\\.\\d+K / \\d+\\.\\d+K ${pct}\\s+Minimum / Average / Maximum Object : \\d+\\.\\d+K / \\d+\\.\\d+K / \\d+\\.\\d+K\\s+OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME\\s+"
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set test "slabtop help"
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spawn $slabtop --help
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expect_pass $test "^\\s+Usage:\\s+\(lt-\)\?slabtop \\\[options\\\]"
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set test "slabtop o then d options"
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spawn $slabtop -o -d 10
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expect_pass $test "Cannot combine -d and -o options"
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set test "slabtop d then o options"
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spawn $slabtop -d 10 -o
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expect_pass $test "Cannot combine -d and -o options"
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set sort_tests {
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"a" "active objects" "^\\s*\\d+\\s+(\\d+)\\s+\\d+%\\s+\\d+\\.\\d+K\\s+\\d+\\s+\\d+\\s+\\d+K\\s+\\S\[^\r\]+\\s*"
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"b" "objects per slab" "^\\s*\\d+\\s+\\d+\\s+\\d+%\\s+\\d+\\.\\d+K\\s+\\d+\\s+(\\d+)\\s+\\d+K\\s+\\S\[^\r\]+\\s*"
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@ -25,9 +30,16 @@ set sort_tests {
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"s" "object size" "^\\s*\\d+\\s+\\d+\\s+\\d+%\\s+(\\d+\\.\\d+)K\\s+\\d+\\s+\\d+\\s+\\d+K\\s+\\S\[^\r\]+\\s*"
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"u" "utilisation" "^\\s*\\d+\\s+\\d+\\s+(\\d+)%\\s+\\d+\\.\\d+K\\s+\\d+\\s+\\d+\\s+\\d+K\\s+\\S\[^\r\]+\\s*"
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}
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# BEGIN - Tests requiring /proc/slabinfo
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if { [ file readable "/proc/slabinfo" ] == 0 } {
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unsupported "slabtop tests disabled as /proc/slabinfo is unreadable"
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} else {
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foreach { flag desc match } $sort_tests {
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set test "slabtop sorted by $desc"
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spawn $slabtop -o -s $flag
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expect_table_dsc $test $slabtop_header $match
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}
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}
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# END - Tests requiring /proc/slabinfo
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