Re: [PATCH 1/23] make section names compatible with -ffunction-sections -fdata-sections

2008-07-01 Thread Valdis . Kletnieks 
On Wed, 02 Jul 2008 02:33:48 +0200, Denys Vlasenko said:

 The purpose of these patches is to make kernel buildable
 with gcc -ffunction-sections -fdata-sections.
 
 Newer gcc and binutils can do dead code and data removal
 at link time. It is achieved using combination of
 -ffunction-sections -fdata-sections options for gcc and
 --gc-sections for ld.

Interesting idea.  Do you happen to have before-and-after 'size vmlinux'
numbers to show how much space is actually reclaimed?


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Re: [PATCH 1/3]: Replace kernel/timeconst.pl with kernel/timeconst.sh

2009-01-03 Thread Valdis . Kletnieks 
On Sat, 03 Jan 2009 19:36:04 CST, Rob Landley said:
 On Saturday 03 January 2009 06:28:22 Ingo Oeser wrote:
   +for i in MSEC 1000 USEC 100
   +do
   + NAME=$(echo $i | awk '{print $1}')
 
  cut -d' ' -f1  does the same
 
   + PERIOD=$(echo $i | awk '{print $2}')
 
  cut -d' ' -f2  does the same

Close, but no cee-gar.  cut does something counter-intuitive with multiple
blanks:

% echo 'ab' | awk '{print $2}'
b
% echo 'ab' | cut -d' ' -f2

% echo 'ab' | sed -r 's/[ ]+/ /g' | cut -d' ' -f2
b

Unfortunately, 'sed -r' isn't in the opengroup.org list of required options,
and sed 's/  / /g' doesn't DTRT for 3 or more blanks (as it won't recursively
apply the change to a *new* double blank formed by the previous change).



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Re: cpuidle - minimum time for sleep

2014-10-09 Thread Valdis . Kletnieks 
On Thu, 09 Oct 2014 21:28:23 +0300, Ran Shalit said:

 Does anybody know what is the minimum expected time for sleep period
 with the cpuidle ?

Both processor dependent and sleep level dependent.  There's a certain
amount of latency induced by the hardware waking up.

Look at /sys/devices/system/cpu/cpu*/cpuidle/state*/latency


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