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Code Issues Releases Activity

Adjust PROF_ARTIFICIAL_FRAMES in the DTrace profile provider on ARM to

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skip 10, rather than 9, frames.  This appears to work quite well in
practice on the BeagleBone Black, so remove a comment about the value
being bogus and replace it with a slightly less negative one.  However,
the number of frames to skip is quite sensitive to details of the timer
and interrupt handling paths, so this is necessarily fragile -- but no
more so than on x86.

Sponsored by:	DARPA, AFRL
This commit is contained in:
Robert Watson 2015-04-25 15:43:12 +00:00
parent cad3cc1310
commit a12df97ed2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=281983
1 changed files with 4 additions and 2 deletions
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6
sys/cddl/dev/profile/profile.c
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@ -134,8 +134,10 @@ struct profile_probe_percpu;
#endif
#ifdef __arm__
/* bogus */
#define PROF_ARTIFICIAL_FRAMES 9
/*
* At least on ARMv7, this appears to work quite well.
*/
#define PROF_ARTIFICIAL_FRAMES 10
#endif
typedef struct profile_probe {