DLPX-88179 estat JSON mode gives histogram keys in nanoseconds rather than microseconds

simonlin-delphix · simonlin-delphix · commit 5974703b1bba · 2023-10-27T11:28:33.000-07:00
PR URL: https://www.github.com/delphix/performance-diagnostics/pull/94
diff --git a/bpf/estat/backend-io.c b/bpf/estat/backend-io.c
@@ -47,7 +47,8 @@ disk_io_start(struct pt_regs *ctx, struct request *reqp)
 int
 disk_io_done(struct pt_regs *ctx, struct request *reqp)
 {
-	u64 ts = bpf_ktime_get_ns();
+	// bpf diplays it in microsecs. so here divide by 1000 to get microsecs
+	u64 ts = bpf_ktime_get_ns() / 1000;
 	io_data_t *data = io_base_data.lookup((u64 *) &reqp);
 	struct bio *bp = reqp->bio;
 

Original file line number	Diff line number	Diff line change
`@@ -47,7 +47,8 @@ disk_io_start(struct pt_regs ctx, struct request reqp)`
`47`	`47`	`int`
`48`	`48`	`disk_io_done(struct pt_regs ctx, struct request reqp)`
`49`	`49`	`{`
`50`		`- u64 ts = bpf_ktime_get_ns();`
	`50`	`+ // bpf diplays it in microsecs. so here divide by 1000 to get microsecs`
	`51`	`+ u64 ts = bpf_ktime_get_ns() / 1000;`
`51`	`52`	`io_data_t data = io_base_data.lookup((u64 ) &reqp);`
`52`	`53`	`struct bio *bp = reqp->bio;`
`53`	`54`