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From bcb8903067ce7a45b67ad0d5cabf83154b56d5ab Mon Sep 17 00:00:00 2001
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From: Viktor Malik <viktor.malik@gmail.com>
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Date: Mon, 9 May 2022 07:58:46 +0200
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Subject: [PATCH 10/10] biosnoop.bt: handle Linux 5.17 block layer update
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The kernel upstream commit:
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https://github.com/torvalds/linux/commit/f3fa33acca9f0058157214800f68b10d8e71ab7a
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has removed the `rq_disk` field from `struct request`. Instead,
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`->q->disk` should be used, so this is reflected in biosnoop.bt.
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The old version of the tool (suitable for kernel <= 5.16) is backed up
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in tools/old and used in the CI.
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---
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tools/biosnoop.bt | 2 +-
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tools/old/biosnoop.bt | 56 +++++++++++++++++++++++++++++++++++++++++++
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2 files changed, 57 insertions(+), 1 deletion(-)
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create mode 100755 tools/old/biosnoop.bt
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diff --git a/tools/biosnoop.bt b/tools/biosnoop.bt
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index 33ad75de..c00ef428 100755
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--- a/tools/biosnoop.bt
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+++ b/tools/biosnoop.bt
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@@ -25,7 +25,7 @@ kprobe:__blk_account_io_start
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@start[arg0] = nsecs;
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@iopid[arg0] = pid;
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@iocomm[arg0] = comm;
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- @disk[arg0] = ((struct request *)arg0)->rq_disk->disk_name;
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+ @disk[arg0] = ((struct request *)arg0)->q->disk->disk_name;
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}
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kprobe:blk_account_io_done,
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diff --git a/tools/old/biosnoop.bt b/tools/old/biosnoop.bt
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new file mode 100755
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index 00000000..1a99643a
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--- /dev/null
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+++ b/tools/old/biosnoop.bt
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@@ -0,0 +1,56 @@
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+#!/usr/bin/env bpftrace
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+/*
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+ * biosnoop.bt Block I/O tracing tool, showing per I/O latency.
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+ * For Linux, uses bpftrace, eBPF.
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+ *
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+ * TODO: switch to block tracepoints. Add offset and size columns.
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+ *
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+ * This is a bpftrace version of the bcc tool of the same name.
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+ *
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+ * For Linux <= 5.16.
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+ *
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+ * 15-Nov-2017 Brendan Gregg Created this.
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+ */
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+
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+#ifndef BPFTRACE_HAVE_BTF
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+#include <linux/blkdev.h>
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+#include <linux/blk-mq.h>
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+#endif
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+
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+BEGIN
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+{
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+ printf("%-12s %-7s %-16s %-6s %7s\n", "TIME(ms)", "DISK", "COMM", "PID", "LAT(ms)");
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+}
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+
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+kprobe:blk_account_io_start,
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+kprobe:__blk_account_io_start
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+{
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+ @start[arg0] = nsecs;
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+ @iopid[arg0] = pid;
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+ @iocomm[arg0] = comm;
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+ @disk[arg0] = ((struct request *)arg0)->rq_disk->disk_name;
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+}
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+
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+kprobe:blk_account_io_done,
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+kprobe:__blk_account_io_done
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+/@start[arg0] != 0 && @iopid[arg0] != 0 && @iocomm[arg0] != ""/
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+
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+{
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+ $now = nsecs;
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+ printf("%-12u %-7s %-16s %-6d %7d\n",
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+ elapsed / 1e6, @disk[arg0], @iocomm[arg0], @iopid[arg0],
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+ ($now - @start[arg0]) / 1e6);
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+
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+ delete(@start[arg0]);
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+ delete(@iopid[arg0]);
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+ delete(@iocomm[arg0]);
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+ delete(@disk[arg0]);
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+}
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+
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+END
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+{
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+ clear(@start);
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+ clear(@iopid);
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+ clear(@iocomm);
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+ clear(@disk);
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+}
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--
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2.35.3
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