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Date: Tue, 9 Jun 2009 10:31:15 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
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Subject: Re: [1.7] Cannot read /proc/stat
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On Jun  8 12:51, Yaakov S wrote:
> On 08/06/2009 12:14, Corinna Vinschen wrote:
>> Confirmed.  The reason is that a datastructure on the NT level has
>> another size on 64 bit systems, and the WOW64 layer doesn't translate
>> the structure into the 32 bit format.  The function is unsupported, so
>> that makes sort of sense.  I'll create another solution using the
>> official function for to fetch that information.  Unfortunaltey it
>> doesn't exist on NT4, so I have to sp3cial case that(*)
>
> Thanks.

This is fixed in -49.  Note, however, that not all information in
/proc/stat is available on 64 bit machines.  Some of the information
printed in /proc/stat, namely the swap_in/swap_out pages, require access
to the SystemPerformanceInformation category in a call to
NtQuerySystemInformation.  The structure returned by this call is also
different on 64 bit systems, even when running under WOW64.  The
SYSTEM_PERFORMANCE_INFORMATION structure was already undocumented on 32
bit systems, and on 64 bit systems it's even more undocumented, if
that's possible :)  Unfortunately, to date there's no official
replacement function which provides the page read/write count.  So, on
64 bit systems, this information is set to 0 in /proc/stat.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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