changes

linux下查看系统工具原码,如IOSTAT等

	  /proc/partitions and then /proc/stat.
	* statistics are now read by iostat and mpstat as unsigned long
	  instead of int to avoid integer overflow.
	* iostat should now handle properly the case when the 'weighted
	  number of milliseconds spent doing I/Os' (read in sysfs or
	  /proc/{partitions,diskstats}) decreases with time.
	* iostat manual page updated.
	* Minor temporary file vulnerability fixed in isag command.
	* README, FAQ and CREDITS files updated.
	* Author's email changed.

2004/02/02: Version 5.0.1 - Sebastien Godard <[e-mail]>
	* -L option added to sadc. Enable sadc to lock its output file
	  to prevent multiple instances from writing to it at once.
	* sa1 and sysstat scripts updated to take advantage of -L option.
	* Handle the case where, under very special circumstances, STDOUT
	  may become unavailable, and sar, iostat and mpstat are no longer
	  able to display anything.
	* sadc as called in sysstat script also uses -F option to force
	  the creation of daily data file.
	* sar, sadc and mpstat manual pages updated.
	* Code cleaned.
	* FAQ and CREDITS files updated.

2003/11/09: Version 5.0.0 - Sebastien Godard <[e-mail]>
	* New fields added to mpstat: %irq (%time spent servicing
	  interrupts) and %soft (%time spent servicing softirqs).
	* sar and iostat updated to take into account time spent servicing
	  interrupts and softirqs when displaying percentage of time
	  in system mode.
	* By default iostat now displays only statistics information for
	  devices that are used by the system. You should now use the ALL
	  keyword to tell iostat to display statistics for every device
	  including those that have never been used.
	* The file version.h is now dynamically created. sysstat's version
	  number is now only recorded in the Makefile.
	* sar manual page updated: beginning with kernels 2.4 and later,
	  pgpgin and pgpgout statistics are in kilobytes and not in
	  blocks (see linux-2.4/fs/proc/proc_misc.c and
	  linux-2.6/mm/page_alloc.c).
	* iostat and mpstat manual pages updated.
	* Makefile updated: don't process NLS files if they are up-to-date.
	* sysstat's RPM spec file updated to enable clean, non-root builds.
	* NLS updated.
	* FAQ and CREDITS files updated.

2003/09/28: Version 4.1.7 - Sebastien Godard <[e-mail]>
	  WARNING: Daily data files format has changed, and is *not*
	  compatible with the previous one! [0x2163]
	* /proc/diskstats is now the preferred source for iostat to get its
	  statistics. If non-existent, iostat falls back on sysfs then
	  on /proc/stat.
	* In addition to devices, partitions can also be entered on the
	  command line for iostat providing that option -x is not used.
	* /dev prefix has been removed from device name displayed by iostat -x.
	* sar -d now looks for disks statistics in /proc/diskstats with
	  post 2.5 kernels.
	* sar uses /proc/vmstat file with post 2.5 kernels to find paging
	  and swapping statistics.
	* activepg, inadtypg, inaclnpg and inatarpg stats removed from
	  sar -B report (they were not really useful).
	* sar -B now displays the number of page faults made by the system
	  (pgfault/s and pgmajflt/s).
	* Stat on shared memory removed from sar -r and sar -R (this stat
	  was no longer maintained by the kernel since 2.4 because of
	  performance problems).
	* Cached swap statistic information added to sar -r.
	* sar -d now displays separate statistics for sectors that are
	  read from or written to devices.
	* %file-sz (percentage of used file handles) is no longer displayed
	  by sar -v, since the upper limit for the number of open files
	  will self-scale with 2.6 kernels.
	* sar now looks more aggressively for network devices in /proc/net/dev.
	* Heading spaces in network interface names removed (sar -n).
	* Fixed a problem reading /proc/interrupts when there are a lot
	  of CPUs (mpstat, sadc).
	* NR_IRQS value increased to 256, since IA64 supports 256 irqs
	  per CPU.
	* Some stats counters are now read as unsigned long instead of
	  unsigned int (pgpgin, pgpgout, pswpin, pswpout, irq_sum).
	* sar and iostat manual pages updated.
	* FAQ, README and CREDITS files updated.
	* NLS updated.

2003/08/20: Version 4.1.6 - Sebastien Godard <[e-mail]>
	  WARNING: Daily data files format has changed, and is *not*
	  compatible with the previous one! [0x2162]
	* Machine uptime calculation is now optimized on SMP machines
	  to minimize the consequences if an overflow condition happens.
	  Especially useful when asking for stats since system boot.
	* -F option added to sadc. Useful to force the creation of the
	  daily data file: an already existing file with a wrong format
	  will be truncated by sadc if this option is used.
	* sa1 script now calls sadc with -F option.
	* The processor number to which the process is attached was no
	  longer displayed by sar -x. Make it appear again.
	* CPU usage for processes, as displayed by sar -x and sar -X, should
	  now be correct on machines where HZ <> 100 (e.g. IA64 architecture).
	* iostat still assumed that jiffies were 100ths of a second in some
	  places. Now use Linux HZ definition *everywhere*.
	* The average I/O requests queue length as displayed by iostat -x was
	  wrongly calculated. This is now fixed.
	* Manual pages updated.
	* NLS updated.
	* Cosmetic changes in various parts of the code.
	* FAQ, README and CREDITS files updated.

2003/07/21: Version 4.1.5 - Sebastien Godard <[e-mail]>
	  WARNING: Daily data files format has changed, and is *not*
	  compatible with the previous one! Delete existing data files
	  in /var/log/sa directory! [0x2161]
	* 'sar -x <pid>' and 'sar -X <pid>' work again.
	* sar had a longstanding bug that prevented option -P from
	  working properly if the machine had more than 32 processors.
	  This is now fixed.
	* Fixed a bug introduced in 4.1.2, which made some LINUX RESTART
	  messages to not be displayed by sar.
	* sar now uses bitmap of char instead of int to avoid endianness
	  problems.
	* sar can now handle a huge number of processors, serial lines and
	  network interfaces.
	* FAQ updated.

2003/07/01: Version 4.1.4 - Sebastien Godard <[e-mail]>
	  WARNING: Daily data files format has changed, and is *not*
	  compatible with the previous one! Delete existing data files
	  in /var/log/sa directory! [0x2160]
	* Fixed the way overflow conditions were handled by sar for
	  interfaces counters.
	* On really big machines with 100 GB of memory or more, the values
	  read by sadc in /proc/meminfo would get truncated and cause havoc
	  in the calculations. This is now fixed.
	* iostat and sar can now read many more disk entries in /proc/stat if
	  necessary.
	* Option "-x SUM" removed for sar. It was used to tell sar to display
	  the total number of minor and major faults made by the system.
	  Unfortunately, the calculation was tricky, and the results were
	  uncertain...
	* NLS updated. Polish translation added. Also proper charset and
	  encoding declarations added to fix msgfmt warnings and allow
	  gettext to recode between various charsets (e.g. German
	  translation will be shown properly both with
	  LANG=de_DE.ISO-8859-1, and LANG=de_DE.UTF-8)
	* Code 'sanitization'.
	* Manual pages updated.
	* README and FAQ files updated.

2003/05/08: Version 4.1.3 - Sebastien Godard <[e-mail]>
	* iostat should now be fully 2.5/2.6 kernel compliant.
	* Disks arrays in iostat are now dynamically sized.
	* iostat: sysfs is now used in preference to /proc/stat if available.
	* iostat will no longer look for statistics in /proc/partitions.
	  sysfs filesystem must now be available for iostat to get its
	  extended stats (post 2.5 kernels).
	* iostat: Devices for which statistics are requested can now be entered
	  on the command line even if option -x is not used.
	* Usage messages updated.
	* Manual pages updated.
	* Code cleaned (dk_drive_sum removed in iostat, long lines folded,
	  functions split in smaller parts, etc.)
	* NLS updated. Romanian translation added.
	* isag upgraded to version 1.22.

2003/01/24: Version 4.1.2 - Sebastien Godard <[e-mail]>
	  WARNING: Daily data files format has changed, and is *not*
	  compatible with the previous one! Delete existing data files
	  in /var/log/sa directory! [0x215f]
	* sar -q now also displays load average for the past 15 minutes.
	* -P option added to sar. This option enables sar to display
	  stats on a per processor basis. Options -U and '-I PROC' are
	  deprecated. 'sar -U ALL' is replaced by 'sar -u -P ALL', and
	  'sar -I PROC' by 'sar -I SUM -P ALL'.
	* Fixed iowait value displayed by sar on SMP machines with pre 2.5
	  kernels.
	* When displaying CPU utilization on SMP machines, sar now
	  recalculates the interval based on current CPU's tick count.
	* Always check that the number of CPUs has not increased when
	  reading /proc/stat (sadc, mpstat).
	* sadc: Don't assume that the first line in /proc/net/sockstat
	  concerns sockets. Check it!
	* Serial lines are ignored by sadc for every kind of kernels
	  (UP, SMP...) if SMP_RACE is defined.
	  SMP_RACE is no longer defined by default in RPM packages.
	* Code cleaned: Dead code removed in iostat.c, some lines longer
	  than 80 chars folded, etc.
	* sar manual page updated.
	* FAQ updated.
	* NLS updated.

2003/01/02: Version 4.1.1 - Sebastien Godard <[e-mail]>
	  WARNING: Daily data files format has changed, and is *not*
	  compatible with the previous one! Delete existing data files
	  in /var/log/sa directory! [0x215e]
	* sar -u/-U, iostat and mpstat can now display time spent in
	  I/O wait mode (with 2.5 kernels and above).
	* Values like -1 and -2 are no longer aliases for keywords
	  ALL and XALL (sar -U, sar -I, mpstat -P).
	* Buglet fixed in iostat.h.
	* LC_CTYPE needs to be set, or it will emit messages with ?????? only
	  on some locales, especially ja_JP.eucJP
	* sar, mpstat and iostat manual pages updated.
	* NLS updated.
	* CREDITS file updated.
	* Typo removed in FAQ file.

2002/11/13: Version 4.0.7 - Sebastien Godard <[e-mail]>
	* Make data for timestamp 00:00:00 appear in one of the daily data
	  files when sar/sadc rotates its output file.
	* Take out check for non SMP configuration when asking for
	  mpstat -P.
	* sargon script updated.
	* FAQ updated.

2002/08/04: Version 4.0.6 - Sebastien Godard <[e-mail]>
	* mpstat now uses a bitmap of char instead of int to avoid endianness
	  problems. As a consequence, mpstat should now work on PowerMac
	  architectures.
	* CPU activity as displayed by mpstat -P for a given processor was
	  in a wrong range on SMP machines (e.g. 0-50% for a dual processor
	  box).
	* Missing bitmap initialization fixed in mpstat.c.
	* Configuration script updated.
	* FAQ updated.

2002/05/12: Version 4.0.5 - Sebastien Godard <[e-mail]>
	* Average wait times and service times as displayed by iostat -x
	  were wrong by a factor of 10. This is now fixed.
	* Linux RESTART messages must now be in the interval specified by
	  -s/-e options to be displayed by sar.
	* Fixed a small bug that affected the timestamp for RESTART messages
	  displayed by sar -h when option -t was used.
	* sar -H now displays its data in local time instead of UTC when
	  option -t is used.
	* sargon shell script added.
	* Created a contrib directory, including sargon and isag commands.
	* NLS updated.
	* FAQ updated.
	* Makefile updated.
	* sar manual page updated.

2002/04/07: Version 4.0.4 - Sebastien Godard <[e-mail]>
	* iostat is now able to display I/O activity in kB/s with 2.4.x
	  kernels (option -k).
	* Fixed a typo in 'sar -W -h' output.
	* Try to handle the case when some parameters in /proc/net/dev
	  may overflow ULONG_MAX.
	* 'sar -d' now displays sectors per second instead of blocks
	  per second.
	* iostat and sar manual pages updated.
	* Added a FAQ.
	* NLS updated: Russian translation added.

2002/01/27: Version 4.0.3 - Sebastien Godard <[e-mail]>
	* iostat now displays statistics in kB/s when option -x is used.
	* Configuration script updated.
	* sar and iostat manual pages updated.
	* umask also set in sa1 shell script.
	* Various sanity checks added.
	* Fixed potential segmentation faults that could happen with some
	  locales.
	* KB (standing for kilobytes) replaced with kB in various places.
	* NLS updated: Italian translation added.

2001/09/22: Version 4.0.2 - Sebastien Godard <[e-mail]>
	* CPU usage, as displayed by iostat, mpstat and sar, should now
	  be OK on machines where HZ <> 100 (e.g. IA64 architecture).
	* MAX_PART constant set to 256 in iostat.h.
	* "-H" database friendly option added to sar.
	* Better disks and network interfaces management (both may be
	  registered dynamically).
	* Made options "-s" and "-e" work when option "-h" is used.
	* isag upgraded to version 1.17.
	* isag installation is now optional and can be chosen at config stage.
	* Now try to install man pages in ${PREFIX}/share/man instead of
	  ${PREFIX}/man.
	* sa2 shell script updated.
	* Configuration script updated.
	* sar manual page updated.
	* NLS updated: Norwegian translation added.

2001/06/24: Version 4.0.1 - Sebastien Godard <[e-mail]>
	* Files created by sa2 shell script were world writable. This is
	  now fixed.
	* sa2.sh shell script updated: only remove sa?? and sar?? files.
	* Don't use PAGE_SHIFT since it no longer necessarily exists in
	  <asm/page.h>. Compute it using page size instead.