From ac8be955049dab828a68b9c68a75144832f8289f Mon Sep 17 00:00:00 2001 From: Ralf Baechle Date: Sat, 20 Jan 2007 00:18:01 +0000 Subject: [MIPS] SMTC: Instant IPI replay. SMTC pseudo-interrupts between TCs are deferred and queued if the target TC is interrupt-inhibited (IXMT). In the first SMTC prototypes, these queued IPIs were serviced on return to user mode, or on entry into the kernel idle loop. The INSTANT_REPLAY option dispatches them as part of local_irq_restore() processing, which adds runtime overhead (hence the option to turn it off), but ensures that IPIs are handled promptly even under heavy I/O interrupt load. Signed-off-by: Ralf Baechle --- arch/mips/Kconfig | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'arch/mips/Kconfig') diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index fd2ff0698a8..bbd386f572d 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -1568,6 +1568,20 @@ config MIPS_MT_FPAFF depends on MIPS_MT default y +config MIPS_MT_SMTC_INSTANT_REPLAY + bool "Low-latency Dispatch of Deferred SMTC IPIs" + depends on MIPS_MT_SMTC + default y + help + SMTC pseudo-interrupts between TCs are deferred and queued + if the target TC is interrupt-inhibited (IXMT). In the first + SMTC prototypes, these queued IPIs were serviced on return + to user mode, or on entry into the kernel idle loop. The + INSTANT_REPLAY option dispatches them as part of local_irq_restore() + processing, which adds runtime overhead (hence the option to turn + it off), but ensures that IPIs are handled promptly even under + heavy I/O interrupt load. + config MIPS_VPE_LOADER_TOM bool "Load VPE program into memory hidden from linux" depends on MIPS_VPE_LOADER -- cgit v1.2.3