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s390/cpumf: Use configuration level indication for sampling data 

Newer hardware provides the level of virtualization that a particular
sample belongs to. Use that information and fall back to the old
heuristics if the sample does not contain that information.

Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Reviewed-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Christian Borntraeger 2016-11-08 09:53:34 +01:00 committed by Martin Schwidefsky
parent b4623d4e5b
commit c19805f870
2 changed files with 22 additions and 8 deletions
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3
arch/s390/include/asm/cpu_mf.h
View File

@ -104,7 +104,8 @@ struct hws_basic_entry {
unsigned int P:1; /* 28 PSW Problem state */
unsigned int AS:2; /* 29-30 PSW address-space control */
unsigned int I:1; /* 31 entry valid or invalid */
unsigned int:16;
unsigned int CL:2; /* 32-33 Configuration Level */
unsigned int:14;
unsigned int prim_asn:16; /* primary ASN */
unsigned long long ia; /* Instruction Address */
unsigned long long gpp; /* Guest Program Parameter */

27
arch/s390/kernel/perf_cpum_sf.c
View File

@ -1002,16 +1002,29 @@ static int perf_push_sample(struct perf_event *event, struct sf_raw_sample *sfr)
psw_bits(regs.psw).as = sfr->basic.AS;
/*
* A non-zero guest program parameter indicates a guest
* sample.
* Note that some early samples or samples from guests without
* Use the hardware provided configuration level to decide if the
* sample belongs to a guest or host. If that is not available,
* fall back to the following heuristics:
* A non-zero guest program parameter always indicates a guest
* sample. Some early samples or samples from guests without
* lpp usage would be misaccounted to the host. We use the asn
* value as a heuristic to detect most of these guest samples.
* If the value differs from the host hpp value, we assume
* it to be a KVM guest.
* value as an addon heuristic to detect most of these guest samples.
* If the value differs from the host hpp value, we assume to be a
* KVM guest.
*/
if (sfr->basic.gpp || sfr->basic.prim_asn != (u16) sfr->basic.hpp)
switch (sfr->basic.CL) {
case 1: /* logical partition */
sde_regs->in_guest = 0;
break;
case 2: /* virtual machine */
sde_regs->in_guest = 1;
break;
default: /* old machine, use heuristics */
if (sfr->basic.gpp ||
sfr->basic.prim_asn != (u16)sfr->basic.hpp)
sde_regs->in_guest = 1;
break;
}
overflow = 0;
if (perf_exclude_event(event, &regs, sde_regs))