[PATCH v6 08/14] tools/xenstore: add accounting trace support

[Juergen Gross <jgross@xxxxxxxx>]

Add a new trace switch "acc" and the related trace calls.

The "acc" switch is off per default.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Reviewed-by: Julien Grall <jgrall@xxxxxxxxxx>
---
 tools/xenstore/xenstored_core.c   |  2 +-
 tools/xenstore/xenstored_core.h   |  1 +
 tools/xenstore/xenstored_domain.c | 10 ++++++++++
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/tools/xenstore/xenstored_core.c b/tools/xenstore/xenstored_core.c
index 43b8772cb3..eb916b0647 100644
--- a/tools/xenstore/xenstored_core.c
+++ b/tools/xenstore/xenstored_core.c
@@ -2756,7 +2756,7 @@ static void set_quota(const char *arg, bool soft)
 
 /* Sorted by bit values of TRACE_* flags. Flag is (1u << index). */
 const char *const trace_switches[] = {
-       "obj", "io", "wrl",
+       "obj", "io", "wrl", "acc",
        NULL
 };
 
diff --git a/tools/xenstore/xenstored_core.h b/tools/xenstore/xenstored_core.h
index 1f811f38cb..3e0734a6c6 100644
--- a/tools/xenstore/xenstored_core.h
+++ b/tools/xenstore/xenstored_core.h
@@ -302,6 +302,7 @@ extern unsigned int trace_flags;
 #define TRACE_OBJ      0x00000001
 #define TRACE_IO       0x00000002
 #define TRACE_WRL      0x00000004
+#define TRACE_ACC      0x00000008
 extern const char *const trace_switches[];
 int set_trace_switch(const char *arg);
 
diff --git a/tools/xenstore/xenstored_domain.c 
b/tools/xenstore/xenstored_domain.c
index a35ed97fd7..03825ca24b 100644
--- a/tools/xenstore/xenstored_domain.c
+++ b/tools/xenstore/xenstored_domain.c
@@ -538,6 +538,12 @@ static struct domain *find_domain_by_domid(unsigned int 
domid)
        return (d && d->introduced) ? d : NULL;
 }
 
+#define trace_acc(...)                         \
+do {                                           \
+       if (trace_flags & TRACE_ACC)            \
+               trace("acc: " __VA_ARGS__);     \
+} while (0)
+
 int acc_fix_domains(struct list_head *head, bool chk_quota, bool update)
 {
        struct changed_domain *cd;
@@ -601,6 +607,8 @@ static int acc_add_changed_dom(const void *ctx, struct 
list_head *head,
                return 0;
 
        errno = 0;
+       trace_acc("local change domid %u: what=%u %d add %d\n", domid, what,
+                 cd->acc[what], val);
        cd->acc[what] += val;
 
        return cd->acc[what];
@@ -1112,6 +1120,8 @@ static int domain_acc_add(struct connection *conn, 
unsigned int domid,
                return domain_acc_add_valid(d, what, ret);
        }
 
+       trace_acc("global change domid %u: what=%u %u add %d\n", domid, what,
+                 d->acc[what], add);
        d->acc[what] = domain_acc_add_valid(d, what, add);
 
        return d->acc[what];
-- 
2.35.3