Buoyed by the success of silly usermode testing, I got brave and stuck
an int3 instruction right in the middle of arch/i386/kernel/irq.c:do_IRQ()
and captured this:
*1 - EIP is at do_IRQ+0x38, with interrupts disabled
*2 - 0x50 (80) bytes of kernel stack are in use
*3 - ECX: last two interrupts were 199485 clocks apart
(boot CPU speed is 199.491 MHz)
*4 - ESI: int3 has been invoked 1653673 times since boot
This is with an SMP kernel on a 1-CPU machine. The 1000 clocks of extra
overhead every interrupt don't seem to make much of a difference...
GDT entry #16: kernel TSS at c0393800, 236 bytes:
CS:0060 <GDT#12,RPL0> EIP:c010afa8 eflags:00000002 <IF:0> *1
SS0:0068 <GDT#13,RPL0> ESP0:c2966000
SS1:0060 <GDT#12,RPL0> ESP1:c0393a00
SS2:0000 <GDT#00,RPL0> ESP2:00000000
SS:0068 <GDT#13,RPL0> ESP:c2965fb0 *2
DS:007b <GDT#15,RPL3> ES:007b <GDT#15,RPL3>
FS:0000 <GDT#00,RPL0> GS:0000 <GDT#00,RPL0>
EAX:c10a2020 EBX:00000000 ECX:00cb5f80 EDX:00000000
ESI:c0393c00 EDI:00000000 EBP:bffffb78 BITMAP:8000
LDT:0088 <GDT#17,RPL0> CR3:035d1000 LINK:0000 <GDT#00,RPL0>
GDT entry #30: debugger TSS at c0395a00, 236 bytes:
CS:0060 <GDT#12,RPL0> EIP:c0110173 eflags:00000006 <IF:0>
SS0:0068 <GDT#13,RPL0> ESP0:c03f27a0
SS1:0000 <GDT#00,RPL0> ESP1:00000000
SS2:0000 <GDT#00,RPL0> ESP2:00000000
SS:0068 <GDT#13,RPL0> ESP:c03f27a0
DS:007b <GDT#15,RPL3> ES:007b <GDT#15,RPL3>
FS:0000 <GDT#00,RPL0> GS:0000 <GDT#00,RPL0>
EAX:aa72bbf2 EBX:c0341a40 ECX:00030b3d EDX:0000004e *3
ESI:00193ba9 EDI:00000010 EBP:c03f03a0 BITMAP:8000
LDT:0088 <GDT#17,RPL0> CR3:00101000 LINK:0080 <GDT#16,RPL0> *4
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This archive was generated by hypermail 2b29 : Wed May 07 2003 - 22:00:18 EST