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scripts/kvm/kvm_stat: Cleanup of platform detection

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s390 machines can also be detected via uname -m, i.e. python's
os.uname, no need for more complicated checks.

Calling uname once and saving its value for multiple checks is
perfectly sufficient. We don't expect the machine's architecture to
change when the script is running anyway.

On multi-cpu systems x86_init currently will get called multiple
times, returning makes sure we don't waste cicles on that.

Signed-off-by: Janosch Frank <frankja@linux.vnet.ibm.com>
Message-Id: <1452525484-32309-16-git-send-email-frankja@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Janosch Frank 2016-01-11 16:17:45 +01:00 committed by Paolo Bonzini
parent 392a7fa3ca
commit 8d3b5ddc4e
1 changed files with 14 additions and 17 deletions
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31
scripts/kvm/kvm_stat
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@ -254,24 +254,21 @@ def aarch64_init():
EXIT_REASONS = AARCH64_EXIT_REASONS
def detect_platform():
if os.uname()[4].startswith('ppc'):
ppc_init()
return
elif os.uname()[4].startswith('aarch64'):
aarch64_init()
return
machine = os.uname()[4]
for line in file('/proc/cpuinfo').readlines():
if line.startswith('flags'):
for flag in line.split():
if flag in X86_EXIT_REASONS:
x86_init(flag)
return
elif line.startswith('vendor_id'):
for flag in line.split():
if flag == 'IBM/S390':
s390_init()
return
if machine.startswith('ppc'):
ppc_init()
elif machine.startswith('aarch64'):
aarch64_init()
elif machine.startswith('s390'):
s390_init()
else:
for line in file('/proc/cpuinfo').readlines():
if line.startswith('flags'):
for flag in line.split():
if flag in X86_EXIT_REASONS:
x86_init(flag)
return
def walkdir(path):