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Date: Sun, 9 Aug 2009 12:14:58 -0300 From: Rogério Brito <rbrito@....usp.br> To: linux-kernel@...r.kernel.org Subject: Confusing help regarding single-depth WCHAN output Hi. I noticed this some releases ago, but only now I was perusing the kernel with a little more attention and got very curious. When doing a "make menuconfig" on an amd64 system, I get the following message: ,---- | Single-depth WCHAN output | CONFIG_SCHED_OMIT_FRAME_POINTER: | | Calculate simpler /proc/<PID>/wchan values. If this option | is disabled then wchan values will recurse back to the | caller function. This provides more accurate wchan values, | at the expense of slightly more scheduling overhead. | | If in doubt, say "Y". | | Symbol: SCHED_OMIT_FRAME_POINTER [=y] | Prompt: Single-depth WCHAN output | Defined at arch/x86/Kconfig:441 | Depends on: X86 | Location: | -> Processor type and features `---- Is the WCHAN option related to omitting a frame pointer? If yes, how could this be written in a more detailed way? Thanks for any comments, Rogério Brito. -- Rogério Brito : rbrito@...ckenzie,ime.usp}.br : GPG key 1024D/7C2CAEB8 http://www.ime.usp.br/~rbrito : http://meusite.mackenzie.com.br/rbrito Projects: algorithms.berlios.de : lame.sf.net : vrms.alioth.debian.org -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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