[PATCH v4 4/6] alloc_tag: add accuracy based filtering to ioctl

[Abhishek Bapat]

Extend the allocinfo filtering mechanism to allow users to filter tags
based on their accuracy.

Signed-off-by: Abhishek Bapat <abhishekbapat@xxxxxxxxxx>
---
 include/uapi/linux/alloc_tag.h | 4 ++++
 lib/alloc_tag.c                | 8 ++++++++
 2 files changed, 12 insertions(+)

diff --git a/include/uapi/linux/alloc_tag.h b/include/uapi/linux/alloc_tag.h
index 7f5acbb44c14..6ea39c4869fe 100644
--- a/include/uapi/linux/alloc_tag.h
+++ b/include/uapi/linux/alloc_tag.h
@@ -26,6 +26,8 @@ struct allocinfo_tag {
 	char function[ALLOCINFO_STR_SIZE];
 	char filename[ALLOCINFO_STR_SIZE];
 	__u64 lineno;
+	/* filter criteria only; see allocinfo_counter.accurate for actual accuracy */
+	__u64 inaccurate;
 };
 
 /* The alignment ensures 32-bit compatible interfaces are not broken */
@@ -45,6 +47,7 @@ enum {
 	ALLOCINFO_FILTER_FUNCTION,
 	ALLOCINFO_FILTER_FILENAME,
 	ALLOCINFO_FILTER_LINENO,
+	ALLOCINFO_FILTER_INACCURATE,
 	ALLOCINFO_FILTER_MIN_SIZE,
 	ALLOCINFO_FILTER_MAX_SIZE,
 	__ALLOCINFO_FILTER_LAST = ALLOCINFO_FILTER_MAX_SIZE
@@ -54,6 +57,7 @@ enum {
 #define ALLOCINFO_FILTER_MASK_FUNCTION		(1 << ALLOCINFO_FILTER_FUNCTION)
 #define ALLOCINFO_FILTER_MASK_FILENAME		(1 << ALLOCINFO_FILTER_FILENAME)
 #define ALLOCINFO_FILTER_MASK_LINENO		(1 << ALLOCINFO_FILTER_LINENO)
+#define ALLOCINFO_FILTER_MASK_INACCURATE	(1 << ALLOCINFO_FILTER_INACCURATE)
 #define ALLOCINFO_FILTER_MASK_MIN_SIZE		(1 << ALLOCINFO_FILTER_MIN_SIZE)
 #define ALLOCINFO_FILTER_MASK_MAX_SIZE		(1 << ALLOCINFO_FILTER_MAX_SIZE)
 
diff --git a/lib/alloc_tag.c b/lib/alloc_tag.c
index a936cf18611a..73fb3d0ab821 100644
--- a/lib/alloc_tag.c
+++ b/lib/alloc_tag.c
@@ -249,6 +249,8 @@ static bool matches_filter(struct codetag *ct, struct allocinfo_filter *filter,
 			   struct alloc_tag_counters *counters,
 			   bool *fetched_counters)
 {
+	bool inaccurate;
+
 	if (!filter || !filter->mask)
 		return true;
 
@@ -274,6 +276,12 @@ static bool matches_filter(struct codetag *ct, struct allocinfo_filter *filter,
 	    ct->lineno != filter->fields.lineno)
 		return false;
 
+	if (filter->mask & ALLOCINFO_FILTER_MASK_INACCURATE) {
+		inaccurate = !!(ct->flags & CODETAG_FLAG_INACCURATE);
+		if (inaccurate != !!(filter->fields.inaccurate))
+			return false;
+	}
+
 	if (filter->mask & (ALLOCINFO_FILTER_MASK_MIN_SIZE | ALLOCINFO_FILTER_MASK_MAX_SIZE)) {
 		if (!*fetched_counters) {
 			*counters = allocinfo_prefetch_counters(ct);
-- 
2.54.0.1099.g489fc7bff1-goog