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Commit 0559f0a7 authored by Anton Blanchard's avatar Anton Blanchard Committed by Paul Mackerras
Browse files

powerpc/pseries: Add dispatch dispersion statistics 



PHYP tells us how often a shared processor dispatch changed physical cpus.
This can highlight performance problems caused by the hypervisor.

Signed-off-by: default avatarAnton Blanchard <anton@samba.org>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent 1f8737aa

arch/powerpc/include/asm/lppaca.h

+1 −1
Original line number Diff line number Diff line
@@ -125,7 +125,7 @@ struct lppaca { 
	// NOTE: This value will ALWAYS be zero for dedicated processors and

	// will NEVER be zero for shared processors (ie, initialized to a 1).

	volatile u32 yield_count;	// PLIC increments each dispatchx00-x03

	u32 reserved6;

	volatile u32 dispersion_count;	// dispatch changed phys cpu    x04-x07

	volatile u64 cmo_faults;	// CMO page fault count         x08-x0F

	volatile u64 cmo_fault_time;	// CMO page fault time          x10-x17

	u8	reserved7[104];		// Reserved                     x18-x7F

arch/powerpc/kernel/lparcfg.c

+16 −0
Original line number Diff line number Diff line
@@ -434,6 +434,21 @@ static void pseries_cmo_data(struct seq_file *m) 
	seq_printf(m, "cmo_page_size=%lu\n", cmo_get_page_size());

}



static void splpar_dispatch_data(struct seq_file *m)

{

	int cpu;

	unsigned long dispatches = 0;

	unsigned long dispatch_dispersions = 0;



	for_each_possible_cpu(cpu) {

		dispatches += lppaca[cpu].yield_count;

		dispatch_dispersions += lppaca[cpu].dispersion_count;

	}



	seq_printf(m, "dispatches=%lu\n", dispatches);

	seq_printf(m, "dispatch_dispersions=%lu\n", dispatch_dispersions);

}



static int pseries_lparcfg_data(struct seq_file *m, void *v)

{

	int partition_potential_processors;
@@ -460,6 +475,7 @@ static int pseries_lparcfg_data(struct seq_file *m, void *v) 
		parse_ppp_data(m);

		parse_mpp_data(m);

		pseries_cmo_data(m);

		splpar_dispatch_data(m);



		seq_printf(m, "purr=%ld\n", get_purr());

	} else {		/* non SPLPAR case */