Searched hist:b1685ab9bd3ae14830acac8ffdc7aafc0fb416e3 (Results 1 – 2 of 2) sorted by relevance
/openbmc/linux/arch/s390/kernel/ |
H A D | perf_cpum_sf.c | diff b1685ab9bd3ae14830acac8ffdc7aafc0fb416e3 Mon Feb 29 09:05:35 CST 2016 Christian Borntraeger <borntraeger@de.ibm.com> s390/cpumf: Improve guest detection heuristics
commit e22cf8ca6f75 ("s390/cpumf: rework program parameter setting to detect guest samples") requires guest changes to get proper guest/host. We can do better: We can use the primary asn value, which is set on all Linux variants to compare this with the host pp value. We now have the following cases: 1. Guest using PP host sample: gpp == 0, asn == hpp --> host guest sample: gpp != 0 --> guest 2. Guest not using PP host sample: gpp == 0, asn == hpp --> host guest sample: gpp == 0, asn != hpp --> guest
As soon as the host no longer sets CR4, we must back out this heuristics - let's add a comment in switch_to.
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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H A D | entry.S | diff b1685ab9bd3ae14830acac8ffdc7aafc0fb416e3 Mon Feb 29 09:05:35 CST 2016 Christian Borntraeger <borntraeger@de.ibm.com> s390/cpumf: Improve guest detection heuristics
commit e22cf8ca6f75 ("s390/cpumf: rework program parameter setting to detect guest samples") requires guest changes to get proper guest/host. We can do better: We can use the primary asn value, which is set on all Linux variants to compare this with the host pp value. We now have the following cases: 1. Guest using PP host sample: gpp == 0, asn == hpp --> host guest sample: gpp != 0 --> guest 2. Guest not using PP host sample: gpp == 0, asn == hpp --> host guest sample: gpp == 0, asn != hpp --> guest
As soon as the host no longer sets CR4, we must back out this heuristics - let's add a comment in switch_to.
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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