Solaris Dynamic Tracing Guide

`stack()`

void stack(int nframes)
void stack(void)

The stack() action records a kernel stack trace to the directed buffer. The kernel stack will be nframes in depth. If nframes is not provided, the number of stack frames recorded is the number specified by the stackframes option. For example:

# dtrace -n uiomove:entry'{stack()}'
  CPU     ID                    FUNCTION:NAME
    0   9153                    uiomove:entry 
                genunix`fop_write+0x1b
                namefs`nm_write+0x1d
                genunix`fop_write+0x1b
                genunix`write+0x1f7

    0   9153                    uiomove:entry 
                genunix`fop_read+0x1b
                genunix`read+0x1d4

    0   9153                    uiomove:entry 
                genunix`strread+0x394
                specfs`spec_read+0x65
                genunix`fop_read+0x1b
                genunix`read+0x1d4
   ...

The stack() action is a little different from other actions in that it may also be used as the key to an aggregation:

# dtrace -n kmem_alloc:entry'{@[stack()] = count()}'
dtrace: description 'kmem_alloc:entry' matched 1 probe
^C

                rpcmod`endpnt_get+0x47c
                rpcmod`clnt_clts_kcallit_addr+0x26f
                rpcmod`clnt_clts_kcallit+0x22
                nfs`rfscall+0x350
                nfs`rfs2call+0x60
                nfs`nfs_getattr_otw+0x9e
                nfs`nfsgetattr+0x26
                nfs`nfs_getattr+0xb8
                genunix`fop_getattr+0x18
                genunix`cstat64+0x30
                genunix`cstatat64+0x4a
                genunix`lstat64+0x1c
                  1

                genunix`vfs_rlock_wait+0xc
                genunix`lookuppnvp+0x19d
                genunix`lookuppnat+0xe7
                genunix`lookupnameat+0x87
                genunix`lookupname+0x19
                genunix`chdir+0x18
                  1

                rpcmod`endpnt_get+0x6b1
                rpcmod`clnt_clts_kcallit_addr+0x26f
                rpcmod`clnt_clts_kcallit+0x22
                nfs`rfscall+0x350
                nfs`rfs2call+0x60
                nfs`nfs_getattr_otw+0x9e
                nfs`nfsgetattr+0x26
                nfs`nfs_getattr+0xb8
                genunix`fop_getattr+0x18
                genunix`cstat64+0x30
                genunix`cstatat64+0x4a
                genunix`lstat64+0x1c
                  1
    ...