Hi all,
I want to know which thread is the kernel lock owner at one moment. It's just
for fun and to learn a bit more.
By the moment, using dtrace I can get the information when a process execute a
mutex_enter syscall.
0 1549 mutex_enter:adaptive-acquire fsflush 60003e50740 0
0 1549 mutex_enter:adaptive-acquire fsflush 600003be578 0
0 1549 mutex_enter:adaptive-acquire fsflush 60003e50740 0
0 1549 mutex_enter:adaptive-acquire fsflush 3000e60a100 0
0 1549 mutex_enter:adaptive-acquire fsflush 600003be578 0
The last column is the first argument of the mutex_enter syscall.
void mutex_enter(kmutex_t *mp);
Thats the address of a pointer to a structure kmutex_t.
typedef struct mutex {
#ifdef _LP64
void *_opaque[1];
#else
void *_opaque[2];
#endif } kmutex_t;
BTW I have read at the Solaris Internal book that the thread address of a lock
owner is contained in the m_owner field of a structure m_adaptive.
The problem is that I don't known how the kmutex_t and m_adaptive structures
are related. This opaque pointer is confusing me.
Any help is welcome, TIA.
Roger
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