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| author | Ralf Baechle <ralf@linux-mips.org> | 2007-01-20 00:18:01 +0000 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2007-01-23 18:26:47 +0000 |
| commit | ac8be955049dab828a68b9c68a75144832f8289f (patch) | |
| tree | c9992cccbc6bcb2f099395ef614ebc96b91a2598 /arch/mips/Kconfig | |
| parent | 9ee79a3d372fcb6729893437f4923c5efd1f85db (diff) | |
| download | op-kernel-dev-ac8be955049dab828a68b9c68a75144832f8289f.zip op-kernel-dev-ac8be955049dab828a68b9c68a75144832f8289f.tar.gz | |
[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 <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/Kconfig')
| -rw-r--r-- | arch/mips/Kconfig | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index fd2ff06..bbd386f 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 |
