Signed-off-by: Robert P. J. Day <rpjday@xxxxxxxxxxxxxx> --- diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug index 610aaec..e40d8d4 100644 --- a/arch/x86/Kconfig.debug +++ b/arch/x86/Kconfig.debug @@ -109,11 +109,17 @@ config 4KSTACKS depends on X86_32 default y help - If you say Y here the kernel will use a 4Kb stacksize for the - kernel stack attached to each process/thread. This facilitates - running more threads on a system and also reduces the pressure - on the VM subsystem for higher order allocations. This option - will also use IRQ stacks to compensate for the reduced stackspace. + If you say Y here, this will redefine the value of THREAD_SIZE + from 8K to 4K and subsequently use a 4K kernel stack for each + process/thread. This facilitates running more threads on a + system and also reduces the pressure on the VM subsystem for + higher-order allocations (that is, trying to find two consecutive + 4K pages rather than just one for each per-process kernel stack). + + To compensate for the smaller per-process stack, interrupts will + now be given their own 4K per-cpu stacks. For more discussion, + see http://lwn.net/Articles/150580/. Also, see the implementation + in the source file arch/x86/kernel/irq_32.c. config X86_FIND_SMP_CONFIG def_bool y ======================================================================== Robert P. J. Day Linux Consulting, Training and Annoying Kernel Pedantry: Have classroom, will lecture. http://crashcourse.ca Waterloo, Ontario, CANADA ======================================================================== -- To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
