Messages in this thread | | | Date | Tue, 1 Apr 2008 12:00:39 +0300 | From | "Pekka Enberg" <> | Subject | Re: [RFC PATCH 25/26] UBIFS: add debugging stuff |
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Hi Artem,
On Tue, Apr 1, 2008 at 11:32 AM, Artem Bityutskiy <Artem.Bityutskiy@nokia.com> wrote: > I am not sure what you mean. I would not want to delve into a general > discussion of the debugging stuff. I would better talk about specific > things. I'll just point you examples of debugging stuff in the kernel > in other subsystems which exists and does not hurt anyone. And I believe > it is helpful. It is compiled out by default and is enable when it is > needed to hunt a bug. > > fs/ext2: ea_idebug(), EXT2FS_DEBUG > fs/xfs: #ifdef DEBUG, XFS_LOUD_RECOVERY and so on > fs/ocfs2: OCFS2_DEBUG_FS > fs/jfs: CONFIG_JFS_DEBUG, assert(), etc > fs: DEBUG_EPOLL, #ifdef DEBUG > fs/jbd2: assert_spin_locked(), CONFIG_JBD2_DEBUG, etc > mm: CONFIG_SLUB_DEBUG, SLABDEBUG, CONFIG_DEBUG_VM, and so on
But they're totally different kind of thing! They're not for disabling hundreds of debug-only printks sprinkled around the kernel. Instead, they let you disable well-defined debugging checks for kernel speed and/or size optimizations. And btw, CONFIG_SLUB_DEBUG is only a kernel size optimization for CONFIG_EMBEDDED. The SLUB debugging code can be turned on and off at run-time.
Pekka
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