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Commit ffa5abbd authored by Brian King's avatar Brian King Committed by Benjamin Herrenschmidt
Browse files

powerpc/pseries: Add CMO paging statistics 



With the addition of Cooperative Memory Overcommitment (CMO) support
for IBM Power Systems, two fields have been added to the VPA to report
paging statistics.  Add support in lparcfg to report them to userspace.

Signed-off-by: default avatarBrian King <brking@linux.vnet.ibm.com>
Signed-off-by: default avatarRobert Jennings <rcj@linux.vnet.ibm.com>
Acked-by: default avatarPaul Mackerras <paulus@samba.org>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 84af458b

arch/powerpc/kernel/lparcfg.c

+20 −0
Original line number Diff line number Diff line
@@ -409,6 +409,25 @@ static int lparcfg_count_active_processors(void) 
	return count;

}



static void pseries_cmo_data(struct seq_file *m)

{

	int cpu;

	unsigned long cmo_faults = 0;

	unsigned long cmo_fault_time = 0;



	if (!firmware_has_feature(FW_FEATURE_CMO))

		return;



	for_each_possible_cpu(cpu) {

		cmo_faults += lppaca[cpu].cmo_faults;

		cmo_fault_time += lppaca[cpu].cmo_fault_time;

	}



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

	seq_printf(m, "cmo_fault_time_usec=%lu\n",

		   cmo_fault_time / tb_ticks_per_usec);

}



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

{

	int partition_potential_processors;
@@ -434,6 +453,7 @@ static int pseries_lparcfg_data(struct seq_file *m, void *v) 
		parse_system_parameter_string(m);

		parse_ppp_data(m);

		parse_mpp_data(m);

		pseries_cmo_data(m);



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

	} else {		/* non SPLPAR case */

include/asm-powerpc/lppaca.h

+4 −1
Original line number Diff line number Diff line
@@ -125,7 +125,10 @@ 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

	u8	reserved6[124];		// Reserved                     x04-x7F

	u32 reserved6;

	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



//=============================================================================

// CACHE_LINE_4-5 0x0180 - 0x027F Contains PMC interrupt data