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top: provide cmdline argument '-H' to enable thread scanning by default

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In particular useful when you want to evaluate the threads in batch mode:
    top -Hbn1

function                                             old     new   delta
top_main                                             928     941     +13
packed_usage                                       33317   33319      +2
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 15/0)               Total: 15 bytes

Signed-off-by: Philippe Belet <philippe.belet@nokia.com>
Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Thomas De Schampheleire 2019-03-26 13:10:21 +01:00 committed by Denys Vlasenko
parent a3ce161363
commit 2b6282117f
1 changed files with 15 additions and 4 deletions
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19
procps/top.c
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@ -222,8 +222,9 @@ enum {
OPT_d = (1 << 0),
OPT_n = (1 << 1),
OPT_b = (1 << 2),
OPT_m = (1 << 3),
OPT_EOF = (1 << 4), /* pseudo: "we saw EOF in stdin" */
OPT_H = (1 << 3),
OPT_m = (1 << 4),
OPT_EOF = (1 << 5), /* pseudo: "we saw EOF in stdin" */
};
#define OPT_BATCH_MODE (option_mask32 & OPT_b)
@ -1043,7 +1044,8 @@ static unsigned handle_input(unsigned scan_mask, duration_t interval)
//usage:# define IF_SHOW_THREADS_OR_TOP_SMP(...)
//usage:#endif
//usage:#define top_trivial_usage
//usage: "[-b"IF_FEATURE_TOPMEM("m")"] [-n COUNT] [-d SECONDS]"
//usage: "[-b"IF_FEATURE_TOPMEM("m")IF_FEATURE_SHOW_THREADS("H")"]"
//usage: " [-n COUNT] [-d SECONDS]"
//usage:#define top_full_usage "\n\n"
//usage: "Provide a view of process activity in real time."
//usage: "\n""Read the status of all processes from /proc each SECONDS"
@ -1076,6 +1078,9 @@ static unsigned handle_input(unsigned scan_mask, duration_t interval)
//usage: IF_FEATURE_TOPMEM(
//usage: "\n"" -m Same as 's' key"
//usage: )
//usage: IF_FEATURE_SHOW_THREADS(
//usage: "\n"" -H Show threads"
//usage: )
/* Interactive testing:
* echo sss | ./busybox top
@ -1110,7 +1115,8 @@ int top_main(int argc UNUSED_PARAM, char **argv)
/* all args are options; -n NUM */
make_all_argv_opts(argv); /* options can be specified w/o dash */
col = getopt32(argv, "d:n:b"IF_FEATURE_TOPMEM("m"), &str_interval, &str_iterations);
col = getopt32(argv, "d:n:bHm", &str_interval, &str_iterations);
/* NB: -m and -H are accepted even if not configured */
#if ENABLE_FEATURE_TOPMEM
if (col & OPT_m) /* -m (busybox specific) */
scan_mask = TOPMEM_MASK;
@ -1129,6 +1135,11 @@ int top_main(int argc UNUSED_PARAM, char **argv)
str_iterations++;
iterations = xatou(str_iterations);
}
#if ENABLE_FEATURE_SHOW_THREADS
if (col & OPT_H) {
scan_mask |= PSSCAN_TASKS;
}
#endif
/* change to /proc */
xchdir("/proc");