powertop: code shrink

function                                             old     new   delta
read_cstate_counts                                   355     360      +5
print_intel_cstates                                  494     499      +5
process_timer_stats                                  554     480     -74
process_irq_counts                                   765     530    -235
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/2 up/down: 10/-309)          Total: -299 bytes

Signed-off-by: Maksym Kryzhanovskyy <xmaks@email.cz>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 35 insertions, 57 deletions

diff --git a/procps/powertop.c b/procps/powertop.c
index 77b071ffb..4c3c3565e 100644
--- a/procps/powertop.c
+++ b/procps/powertop.c
@@ -169,7 +169,7 @@ static void read_cstate_counts(ullong *usage, ullong *duration)
                 if (len < 3 || len > BIG_SYSNAME_LEN)
                         continue;
 
-                sprintf(buf, "/proc/acpi/processor/%s/power", d->d_name);
+                sprintf(buf, "%s/%s/power", "/proc/acpi/processor", d->d_name);
                 fp = fopen_for_read(buf);
                 if (!fp)
                         continue;
@@ -321,28 +321,17 @@ static void process_irq_counts(void)
                 /*  0:  143646045  153901007   IO-APIC-edge      timer
                  *   ^
                  */
+                *p = '\0';
                 /* Deal with non-maskable interrupts -- make up fake numbers */
-                nr = -1;
-                if (buf[0] != ' ' && !isdigit(buf[0])) {
-//TODO: optimize
-                        if (strncmp(buf, "NMI:", 4) == 0)
-                                nr = 20000;
-                        if (strncmp(buf, "RES:", 4) == 0)
-                                nr = 20001;
-                        if (strncmp(buf, "CAL:", 4) == 0)
-                                nr = 20002;
-                        if (strncmp(buf, "TLB:", 4) == 0)
-                                nr = 20003;
-                        if (strncmp(buf, "TRM:", 4) == 0)
-                                nr = 20004;
-                        if (strncmp(buf, "THR:", 4) == 0)
-                                nr = 20005;
-                        if (strncmp(buf, "SPU:", 4) == 0)
-                                nr = 20006;
+                nr = index_in_strings("NMI\0RES\nCAL\0TLB\0TRM\0THR\0SPU\0", buf);
+                if (nr != -1) {
+                        nr += 20000;
                 } else {
                         /* bb_strtou doesn't eat leading spaces, using strtoul */
                         nr = strtoul(buf, NULL, 10);
                 }
+                *p = ':';
+
                 if (nr == -1)
                         continue;
 
@@ -430,33 +419,31 @@ static NOINLINE int process_timer_stats(void)
                 while (fgets(buf, sizeof(buf), fp)) {
                         const char *count, *process, *func;
                         char *p;
-                        int cnt;
+                        int idx;
 
                         count = skip_whitespace(buf);
+                        if (strcmp(strchrnul(count, ' '), " total events") == 0)
+                                break;
                         p = strchr(count, ',');
                         if (!p)
                                 continue;
                         *p++ = '\0';
-                        if (strcmp(strchrnul(count, ' '), " total events") == 0)
-                                break;
-                        p = skip_whitespace(p); /* points to pid */
-
-/* Find char ' ', then eat remaining spaces */
-#define ADVANCE(p) do {           \
-        (p) = strchr((p), ' ');   \
-        if (!(p))                 \
-                continue;         \
-        *(p) = '\0';              \
-        (p)++;                    \
-        (p) = skip_whitespace(p); \
-} while (0)
-                        /* Get process name */
-                        ADVANCE(p);
-                        process = p;
-                        /* Get function */
-                        ADVANCE(p);
+                        if (strchr(count, 'D'))
+                                continue; /* deferred */
+                        p = skip_whitespace(p); /* points to pid now */
+                        process = NULL;
+ get_func_name:
+                        p = strchr(p, ' ');
+                        if (!p)
+                                continue;
+                        *p++ = '\0';
+                        p = skip_whitespace(p);
+                        if (process == NULL) {
+                                process = p;
+                                goto get_func_name;
+                        }
                         func = p;
-#undef ADVANCE
+
                         //if (strcmp(process, "swapper") == 0
                         // && strcmp(func, "hrtimer_start_range_ns (tick_sched_timer)\n") == 0
                         //) {
@@ -471,38 +458,29 @@ static NOINLINE int process_timer_stats(void)
                         //if (strcmp(process, "powertop") == 0)
                         //      continue;
 
-                        if (strcmp(process, "insmod") == 0)
-                                process = "[kernel module]";
-                        if (strcmp(process, "modprobe") == 0)
-                                process = "[kernel module]";
-                        if (strcmp(process, "swapper") == 0)
-                                process = "<kernel core>";
+                        idx = index_in_strings("insmod\0modprobe\0swapper\0", process);
+                        if (idx != -1) {
+                                process = idx < 2 ? "[kernel module]" : "<kernel core>";
+                        }
 
                         strchrnul(p, '\n')[0] = '\0';
 
-                        {
-                                char *tmp;
-                                cnt = bb_strtoull(count, &tmp, 10);
-                                p = tmp;
-                        }
-                        while (*p != '\0') {
-                                if (*p++ == 'D') /* deferred */
-                                        goto skip;
-                        }
+                        // 46D\01136\0kondemand/1\0do_dbs_timer (delayed_work_timer_fn)
+                        // ^          ^            ^
+                        // count      process      func
 
                         //if (strchr(process, '['))
                                 sprintf(line, "%15.15s : %s", process, func);
                         //else
                         //      sprintf(line, "%s", process);
-                        save_line(line, cnt);
- skip: ;
+                        save_line(line, bb_strtoull(count, NULL, 10));
                 }
                 fclose(fp);
         }
 
         n = 0;
 #if ENABLE_FEATURE_POWERTOP_PROCIRQ
-        if (strstr(buf, "total events")) {
+        if (strstr(buf, " total events")) {
                 n = bb_strtoull(buf, NULL, 10) / G.total_cpus;
                 if (n > 0 && n < G.interrupt_0) {
                         sprintf(line, "    <interrupt> : %s", "extra timer interrupt");
@@ -566,7 +544,7 @@ static NOINLINE void print_intel_cstates(void)
                 if (!isdigit(d->d_name[3]))
                         continue;
 
-                len = sprintf(fname, "/sys/devices/system/cpu/%s/cpuidle", d->d_name);
+                len = sprintf(fname, "%s/%s/cpuidle", "/sys/devices/system/cpu", d->d_name);
                 dir = opendir(fname);
                 if (!dir)
                         continue;