[Xen-devel] [PATCH]Enhance Cx stability by adding softirq check before entry cstate

["Wei, Gang" <gang.wei@xxxxxxxxx>]

Without checking softirq_pending before entry Cx state, softirq such as
SCHEDULE_SOFTIRQ and TIMER_SOFTIRQ can't be handled timely. It may cause
severe failures such as disk I/O failure.

This patch addresses the issue above, meanwhile move timing points
closer to cstate entry/exit point to make C3 residency more accurate,
and enable irq a little earlier.

Signed-off-by: Wei Gang <gang.wei@xxxxxxxxx>
Signed-off-by: Tian Kevin <kevin.tian@xxxxxxxxx>

Jimmy

Attachment: softirq_check_bf_cx_entry.patch
Description: softirq_check_bf_cx_entry.patch

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