[Xen-devel] How to enable debug information?

["Weiping Guo" <wguo1990@xxxxxxxxx>]

Hi Everyone,

I am a newbie to the Xen. I want to understand how the blktap disk works. I found out the following files under:

tools/blktap/drivers/tapdisk.h tapdisk.c

where it has the definition of 'DPRINTF'

/*If enabled, log all debug messages to syslog*/
#if 1
#define DPRINTF(_f, _a...) syslog( LOG_DEBUG, _f , ## _a )
#else
#define DPRINTF(_f, _a...) ((void)0)
#endif

My question is how to enable the debug so that debug message can be sent to syslog? Which log file should I look into?

Thanks a lot.

Jim

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