[Bug 1582181] Re: AArch64: slow cpuinfo due to redundant loop

[Ike Panhc]

lshw in xenial-proposed fixes this issue.

ubuntu at recht:~$ time lshw > /dev/null;dpkg --list | grep lshw
WARNING: you should run this program as super-user.
WARNING: output may be incomplete or inaccurate, you should run this program as super-user.

real	1m50.371s
user	1m50.240s
sys	0m0.104s
ii  lshw                             02.17-1.1ubuntu3.4                         arm64        information about hardware configuration

ubuntu at recht:~$ time lshw > /dev/null;dpkg --list | grep lshw
WARNING: you should run this program as super-user.
WARNING: output may be incomplete or inaccurate, you should run this program as super-user.

real	0m2.548s
user	0m2.460s
sys	0m0.084s
ii  lshw                             02.17-1.1ubuntu3.5                         arm64        information about hardware configuration


** Tags removed: verification-needed-xenial
** Tags added: verification-done-xenial

** Changed in: lshw (Ubuntu Artful)
     Assignee: (unassigned) => Ike Panhc (ikepanhc)

** Changed in: lshw (Ubuntu Xenial)
     Assignee: (unassigned) => Ike Panhc (ikepanhc)

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https://bugs.launchpad.net/bugs/1582181

Title:
  AArch64: slow cpuinfo due to redundant loop

Status in lshw package in Ubuntu:
  Fix Released
Status in lshw source package in Xenial:
  Fix Committed
Status in lshw source package in Artful:
  Fix Committed
Status in lshw source package in Bionic:
  Fix Released

Bug description:
  [Impact]
  lshw takes too long time on parsing /proc/cpuinfo on aarch64 system
  It takes minutes on 96cores and almost 10min on 224cores system.

  [Test Case]
  `time lshw` and it shall be less then 15sec

  [Regression Potential]
  This patch only modifies codes for aarch64. Lowest regression rick on other arch and has been tested on aarch64

  [Other Info]
  Patch has been merged into upstream branch.
  https://github.com/lyonel/lshw/commit/20cda77239e8604e798b87a0441e694edb0214d1

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