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authorSuresh Warrier <warrier@linux.vnet.ibm.com>2015-03-20 20:39:48 +1100
committerAlexander Graf <agraf@suse.de>2015-04-21 15:21:30 +0200
commit6e0365b782739eb41b03bcfd23abeefacbf0817a (patch)
tree258cd96302294e468779e4b979aa6de48fd4770b
parentb0221556dbd3c31c47f37703f856aeeffc78abd3 (diff)
downloadlinux-6e0365b782739eb41b03bcfd23abeefacbf0817a.tar.bz2
KVM: PPC: Book3S HV: Add ICP real mode counters
Add two counters to count how often we generate real-mode ICS resend and reject events. The counters provide some performance statistics that could be used in the future to consider if the real mode functions need further optimizing. The counters are displayed as part of IPC and ICP state provided by /sys/debug/kernel/powerpc/kvm* for each VM. Also added two counters that count (approximately) how many times we don't find an ICP or ICS we're looking for. These are not currently exposed through sysfs, but can be useful when debugging crashes. Signed-off-by: Suresh Warrier <warrier@linux.vnet.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
-rw-r--r--arch/powerpc/kvm/book3s_hv_rm_xics.c7
-rw-r--r--arch/powerpc/kvm/book3s_xics.c10
-rw-r--r--arch/powerpc/kvm/book3s_xics.h5
3 files changed, 20 insertions, 2 deletions
diff --git a/arch/powerpc/kvm/book3s_hv_rm_xics.c b/arch/powerpc/kvm/book3s_hv_rm_xics.c
index 73bbe9246512..6dded8c75234 100644
--- a/arch/powerpc/kvm/book3s_hv_rm_xics.c
+++ b/arch/powerpc/kvm/book3s_hv_rm_xics.c
@@ -227,6 +227,7 @@ static void icp_rm_deliver_irq(struct kvmppc_xics *xics, struct kvmppc_icp *icp,
ics = kvmppc_xics_find_ics(xics, new_irq, &src);
if (!ics) {
/* Unsafe increment, but this does not need to be accurate */
+ xics->err_noics++;
return;
}
state = &ics->irq_state[src];
@@ -239,6 +240,7 @@ static void icp_rm_deliver_irq(struct kvmppc_xics *xics, struct kvmppc_icp *icp,
icp = kvmppc_xics_find_server(xics->kvm, state->server);
if (!icp) {
/* Unsafe increment again*/
+ xics->err_noicp++;
goto out;
}
}
@@ -383,6 +385,7 @@ static void icp_rm_down_cppr(struct kvmppc_xics *xics, struct kvmppc_icp *icp,
* separately here as well.
*/
if (resend) {
+ icp->n_check_resend++;
icp_rm_check_resend(xics, icp);
}
}
@@ -500,11 +503,13 @@ int kvmppc_rm_h_ipi(struct kvm_vcpu *vcpu, unsigned long server,
/* Handle reject in real mode */
if (reject && reject != XICS_IPI) {
+ this_icp->n_reject++;
icp_rm_deliver_irq(xics, icp, reject);
}
/* Handle resends in real mode */
if (resend) {
+ this_icp->n_check_resend++;
icp_rm_check_resend(xics, icp);
}
@@ -566,6 +571,7 @@ int kvmppc_rm_h_cppr(struct kvm_vcpu *vcpu, unsigned long cppr)
* attempt (see comments in icp_rm_deliver_irq).
*/
if (reject && reject != XICS_IPI) {
+ icp->n_reject++;
icp_rm_deliver_irq(xics, icp, reject);
}
bail:
@@ -616,6 +622,7 @@ int kvmppc_rm_h_eoi(struct kvm_vcpu *vcpu, unsigned long xirr)
/* Still asserted, resend it */
if (state->asserted) {
+ icp->n_reject++;
icp_rm_deliver_irq(xics, icp, irq);
}
diff --git a/arch/powerpc/kvm/book3s_xics.c b/arch/powerpc/kvm/book3s_xics.c
index 5f7beebd36a6..8f3e6cc54d95 100644
--- a/arch/powerpc/kvm/book3s_xics.c
+++ b/arch/powerpc/kvm/book3s_xics.c
@@ -901,6 +901,7 @@ static int xics_debug_show(struct seq_file *m, void *private)
unsigned long flags;
unsigned long t_rm_kick_vcpu, t_rm_check_resend;
unsigned long t_rm_reject, t_rm_notify_eoi;
+ unsigned long t_reject, t_check_resend;
if (!kvm)
return 0;
@@ -909,6 +910,8 @@ static int xics_debug_show(struct seq_file *m, void *private)
t_rm_notify_eoi = 0;
t_rm_check_resend = 0;
t_rm_reject = 0;
+ t_check_resend = 0;
+ t_reject = 0;
seq_printf(m, "=========\nICP state\n=========\n");
@@ -928,12 +931,15 @@ static int xics_debug_show(struct seq_file *m, void *private)
t_rm_notify_eoi += icp->n_rm_notify_eoi;
t_rm_check_resend += icp->n_rm_check_resend;
t_rm_reject += icp->n_rm_reject;
+ t_check_resend += icp->n_check_resend;
+ t_reject += icp->n_reject;
}
- seq_puts(m, "ICP Guest Real Mode exit totals: ");
- seq_printf(m, "\tkick_vcpu=%lu check_resend=%lu reject=%lu notify_eoi=%lu\n",
+ seq_printf(m, "ICP Guest->Host totals: kick_vcpu=%lu check_resend=%lu reject=%lu notify_eoi=%lu\n",
t_rm_kick_vcpu, t_rm_check_resend,
t_rm_reject, t_rm_notify_eoi);
+ seq_printf(m, "ICP Real Mode totals: check_resend=%lu resend=%lu\n",
+ t_check_resend, t_reject);
for (icsid = 0; icsid <= KVMPPC_XICS_MAX_ICS_ID; icsid++) {
struct kvmppc_ics *ics = xics->ics[icsid];
diff --git a/arch/powerpc/kvm/book3s_xics.h b/arch/powerpc/kvm/book3s_xics.h
index 055424c43249..56ea44f9867f 100644
--- a/arch/powerpc/kvm/book3s_xics.h
+++ b/arch/powerpc/kvm/book3s_xics.h
@@ -83,6 +83,9 @@ struct kvmppc_icp {
unsigned long n_rm_check_resend;
unsigned long n_rm_reject;
unsigned long n_rm_notify_eoi;
+ /* Counters for handling ICP processing in real mode */
+ unsigned long n_check_resend;
+ unsigned long n_reject;
/* Debug stuff for real mode */
union kvmppc_icp_state rm_dbgstate;
@@ -102,6 +105,8 @@ struct kvmppc_xics {
u32 max_icsid;
bool real_mode;
bool real_mode_dbg;
+ u32 err_noics;
+ u32 err_noicp;
struct kvmppc_ics *ics[KVMPPC_XICS_MAX_ICS_ID + 1];
};