kernel stack usage

[Martin Husemann <martin%duskware.de@localhost>]

Hey folks,

triggered by some experiments simonb did on mips I wrote a script to find
the functions using the bigest stack frame in my current sparc64 kernel.

The top 15 list is:

Frame/b Function
4096    pci_conf_print at pci_subr.c:4812
4096    dtv_demux_read at dtv_demux.c:493
3536    SHA3_Selftest at sha3.c:430
3408    genfb_calc_hsize at genfb.c:630
3248    radeonfb_pickres at radeonfb.c:4127
2304    radeonfb_set_cursor at radeonfb.c:3690
2272    gem_pci_attach at if_gem_pci.c:147
2256    twoway_memmem at memmem.c:84
2240    bwfm_rx_event_cb at bwfm.c:2099
2240    compat_60_ptmget_ioctl at tty_60.c:70
2112    db_stack_trace_print at db_trace.c:77
1664    wdcprobe_with_reset at wdc.c:491
1424    nfsrv_rename at nfs_serv.c:1906
1408    OF_mapintr at ofw_machdep.c:728
1344    sysctl_hw_firmware_path at firmload.c:81
1280    fw_bmr at firewire.c:2296
1264    cdioctl at cd.c:1204
1248    cpu_reset_fpustate at cpu.c:400
1248    aubtfwl_attach_hook at aubtfwl.c:273
1248    uvm_swap_stats at uvm_swap.c:726

(left column is size of the frame on sparc64 in bytes)

I think anything > 1k is dubious and should be checked.

Martin