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sched: avoid migrating when softint on tgt cpu should be short

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The scheduling change (bug 31501544) to avoid putting RT threads on cores that
are handling softint's was catching cases where there was no reason
to believe the softint would take a long time, resulting in unnecessary
migration overhead. This patch reduces the migration to cases where
the core has a softint that is actually likely to take a long time,
as opposed to the RCU, SCHED, and TIMER softints that are rather quick.
Bug: 31752786

Change-Id: Ib4e179f1e15c736b2fdba31070494e357e9fbbe2
Git-commit: ce05770bd37b8065b61ef650108ecef2b97b148b
Git-repo: https://android.googlesource.com/kernel/msm
[pkondeti@codeaurora.org: resolved minor merge conflicts]
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>
This commit is contained in:
John Dias
2016-10-05 15:11:40 -07:00
committed by Satya Durga Srinivasu Prabhala
parent 54869f74a2
commit 615d2fba03
3 changed files with 24 additions and 4 deletions
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7
include/linux/interrupt.h
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@@ -478,6 +478,12 @@ enum
};
#define SOFTIRQ_STOP_IDLE_MASK (~(1 << RCU_SOFTIRQ))
/* Softirq's where the handling might be long: */
#define LONG_SOFTIRQ_MASK ((1 << NET_TX_SOFTIRQ) | \
(1 << NET_RX_SOFTIRQ) | \
(1 << BLOCK_SOFTIRQ) | \
(1 << IRQ_POLL_SOFTIRQ) | \
(1 << TASKLET_SOFTIRQ))
/* map softirq index to softirq name. update 'softirq_to_name' in
* kernel/softirq.c when adding a new softirq.
@@ -513,6 +519,7 @@ extern void raise_softirq_irqoff(unsigned int nr);
extern void raise_softirq(unsigned int nr);
DECLARE_PER_CPU(struct task_struct *, ksoftirqd);
DECLARE_PER_CPU(__u32, active_softirqs);
static inline struct task_struct *this_cpu_ksoftirqd(void)
{