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powerpc/pseries: Protect against hogging the cpu while setting up the stats

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When enabling or disabling the vcpu dispatch statistics, we do a lot of
work including allocating/deallocating memory across all possible cpus
for the DTL buffer. In order to guard against hogging the cpu for too
long, track the time we're taking and yield the processor if necessary.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Naveen N. Rao
2019-07-03 22:34:01 +05:30
committed by Michael Ellerman
parent d62c8deeb6
commit 18a593c8b5
3 changed files with 22 additions and 11 deletions
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arch/powerpc/include/asm/lppaca.h
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@@ -201,7 +201,7 @@ extern rwlock_t dtl_access_lock;
extern void (*dtl_consumer)(struct dtl_entry *entry, u64 index);
extern void register_dtl_buffer(int cpu);
extern void alloc_dtl_buffers(void);
extern void alloc_dtl_buffers(unsigned long *time_limit);
extern long hcall_vphn(unsigned long cpu, u64 flags, __be32 *associativity);
#endif /* CONFIG_PPC_BOOK3S */