Alternative to [PATCH] 4a/6: 64 bit accounting.
Max out elapsed time at highest representable (unsigned long) value.
While we could stuff two more bits into comp_t on 32 bit platforms, this
should keep old applications happy that expand it into unsigned long
variables.
Compute job start time correctly after 32 bit jiffies wrap.
--- linux-2.5.15-j64/kernel/acct.c Sun May 5 08:32:04 2002
+++ linux-2.5.15-j64/kernel/acct.c Sat May 11 13:16:34 2002
@@ -50,6 +50,7 @@
#include <linux/file.h>
#include <linux/tty.h>
#include <asm/uaccess.h>
+#include <asm/div64.h>
/*
* These constants control the amount of freespace that suspend and
@@ -299,6 +300,7 @@
mm_segment_t fs;
unsigned long vsize;
unsigned long flim;
+ u64 elapsed;
/*
* First check to see if there is enough free_space to continue
@@ -316,9 +318,11 @@
strncpy(ac.ac_comm, current->comm, ACCT_COMM);
ac.ac_comm[ACCT_COMM - 1] = '\0';
- ac.ac_btime = CT_TO_SECS(current->start_time) +
- (xtime.tv_sec - (jiffies / HZ));
- ac.ac_etime = encode_comp_t(jiffies - current->start_time);
+ elapsed = get_jiffies64() - current->start_time;
+ ac.ac_etime = encode_comp_t(elapsed > (unsigned long) -1l ?
+ (unsigned long) -1l : (unsigned long) elapsed);
+ do_div(elapsed, HZ);
+ ac.ac_btime = xtime.tv_sec - elapsed;
ac.ac_utime = encode_comp_t(current->times.tms_utime);
ac.ac_stime = encode_comp_t(current->times.tms_stime);
ac.ac_uid = current->uid;
-
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This archive was generated by hypermail 2b29 : Tue May 14 2002 - 12:00:16 EST