tolerate sparse CPU numbering

Makefile

@@ -110,6 +110,16 @@ check_gcc = $(shell if $(CC) $(ALL_CPPFLAGS) $(ALL_CFLAGS) dummy.c $(ALL_LDFLAGS
 
 ALL_CFLAGS += $(call check_gcc,-Wdeclaration-after-statement,)
 ALL_CFLAGS += $(call check_gcc,-Wpadded,)
+ALL_CFLAGS += $(call check_gcc,-Wstrict-aliasing=2,)
+
+# Adding -fno-gcse might be good for those files which
+# use computed goto.
+#ALL_CFLAGS += $(call check_gcc,-fno-gcse,)
+
+# These are part of -O3 but we dislike -finline-functions.
+# Using -fno-inline-functions with -O3 would work too.
+ALL_CFLAGS += $(call check_gcc,-fweb,)
+ALL_CFLAGS += $(call check_gcc,-frename-registers,)
 
 # Be 64-bit if at all possible. In a cross-compiling situation, one may
 # do "make m64=-m32 lib64=lib" to produce 32-bit executables. DO NOT

NEWS

@@ -1,10 +1,12 @@
 procps-3.2.1 --> procps-3.2.2
 
+now using gcc -fweb and -frename-registers options
 avoid warning about -lncurses when not linking -- thanks FLWM
 ps: personality-specific -x support (HP-UX and SVR4-MP)
 ps: k option, same as --sort
 vmstat: fixed -d
-top: try to handle terminals lacking rmam and smam
+top: try to handle terminals lacking rmam and smam     #235003
+top: tolerate sparse CPU numbering
 
 procps-3.2.0 --> procps-3.2.1
 

top.c

@@ -78,9 +78,8 @@ static RCF_t Rc = DEF_RCFILE;
 static unsigned Page_size;
 static unsigned page_to_kb_shift;
 
-        /* SMP, Irix/Solaris mode, Linux 2.5.xx support */
+        /* SMP Irix/Solaris mode */
-static int  Cpu_tot,
+static int  Cpu_tot;
-           *Cpu_map;
         /* assume no IO-wait stats, overridden if linux 2.5.41 */
 static const char *States_fmts = STATES_line2x4;
 
@@ -928,7 +927,7 @@ static CPU_t *cpus_refresh (CPU_t *cpus)
    if (!fgets(buf, sizeof(buf), fp)) std_err("failed /proc/stat read");
    cpus[Cpu_tot].x = 0;  // FIXME: can't tell by kernel version number
    cpus[Cpu_tot].y = 0;  // FIXME: can't tell by kernel version number
-   num = sscanf(buf, CPU_FMTS_JUST1,
+   num = sscanf(buf, "cpu %Lu %Lu %Lu %Lu %Lu %Lu %Lu",
       &cpus[Cpu_tot].u,
       &cpus[Cpu_tot].n,
       &cpus[Cpu_tot].s,
@@ -939,18 +938,20 @@ static CPU_t *cpus_refresh (CPU_t *cpus)
    );
    if (num < 4)
          std_err("failed /proc/stat read");
+
    // and just in case we're 2.2.xx compiled without SMP support...
-   if (Cpu_tot == 1) memcpy(cpus, &cpus[1], sizeof(CPU_t));
+   if (Cpu_tot == 1) {
+      cpus[1].id = 0;
+      memcpy(cpus, &cpus[1], sizeof(CPU_t));
+   }
 
    // now value each separate cpu's tics
    for (i = 0; 1 < Cpu_tot && i < Cpu_tot; i++) {
-#ifdef PRETEND4CPUS
-      rewind(fp);
-#endif
       if (!fgets(buf, sizeof(buf), fp)) std_err("failed /proc/stat read");
       cpus[i].x = 0;  // FIXME: can't tell by kernel version number
       cpus[i].y = 0;  // FIXME: can't tell by kernel version number
-      num = sscanf(buf, CPU_FMTS_MULTI,
+      num = sscanf(buf, "cpu%u %Lu %Lu %Lu %Lu %Lu %Lu %Lu",
+         &cpus[i].id,
          &cpus[i].u, &cpus[i].n, &cpus[i].s, &cpus[i].i, &cpus[i].w, &cpus[i].x, &cpus[i].y
       );
       if (num < 4)
@@ -1535,13 +1536,8 @@ static const char *rc_write_whatever (void) {
 
 /*######  Startup routines  ##############################################*/
 
-#ifdef PRETEND4CPUS
+// No mater what *they* say, we handle the really really BIG and
-#define smp_num_cpus 4
+// IMPORTANT stuff upon which all those lessor functions depend!
-#endif
-
-        /*
-         * No mater what *they* say, we handle the really really BIG and
-         * IMPORTANT stuff upon which all those lessor functions depend! */
 static void before (char *me)
 {
    int i;
@@ -1552,9 +1548,6 @@ static void before (char *me)
 
       /* establish cpu particulars -- even bigger! */
    Cpu_tot = smp_num_cpus;
-   Cpu_map = alloc_r(NULL, sizeof(int) * Cpu_tot);
-   for (i = 0; i < Cpu_tot; i++)
-      Cpu_map[i] = i;
    if (linux_version_code > LINUX_VERSION(2, 5, 41))
       States_fmts = STATES_line2x5;
    if (linux_version_code >= LINUX_VERSION(2, 6, 0))  // grrr... only some 2.6.0-testX :-(
@@ -2875,7 +2868,7 @@ static proc_t **summary_show (void)
          char tmp[SMLBUFSIZ];
          // display each cpu's states separately
          for (i = 0; i < Cpu_tot; i++) {
-            snprintf(tmp, sizeof(tmp), " Cpu%-2d:", Rc.mode_irixps ? i : Cpu_map[i]);
+            snprintf(tmp, sizeof(tmp), "Cpu%-3d:", smpcpu[i].id);
             summaryhlp(&smpcpu[i], tmp);
          }
       }

top.h

@@ -33,7 +33,6 @@
 // Development/Debugging defines -----------------------------------
 //#define ATEOJ_REPORT    // report a bunch of stuff, at end-of-job
 //#define PRETEND2_5_X    // pretend we're linux 2.5.x (for IO-wait)
-//#define PRETEND4CPUS    // pretend we're smp with 4 ticsers (sic)
 //#define PRETENDNOCAP    // use a terminal without essential caps
 //#define STDOUT_IOLBF    // disable our own stdout _IOFBF override
 
@@ -197,6 +196,7 @@ typedef struct HST_t {
 typedef struct CPU_t {
    TIC_t u, n, s, i, w, x, y;                             // as represented in /proc/stat
    TIC_t u_sav, s_sav, n_sav, i_sav, w_sav, x_sav, y_sav; // in the order of our display
+   unsigned id;  // the CPU ID number
 } CPU_t;
 
 // These 2 types support rcfile compatibility
@@ -355,15 +355,6 @@ typedef struct WIN_t {
       "Usr", USR_FIELDS } \
    } }
 
-// These are the possible fscanf formats used in /proc/stat
-// reads during history processing.
-// ( 5th number only for Linux 2.5.41 and above ) */
-#define CPU_FMTS_JUST1  "cpu %Lu %Lu %Lu %Lu %Lu %Lu %Lu"
-#ifdef PRETEND4CPUS
-#define CPU_FMTS_MULTI CPU_FMTS_JUST1
-#else
-#define CPU_FMTS_MULTI  "cpu%*d %Lu %Lu %Lu %Lu %Lu %Lu %Lu"
-#endif
 
 // Summary Lines specially formatted string(s) --
 // see 'show_special' for syntax details + other cautions.