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From 2ada4cee035c4d07391faa870a5df1874d657b65 Mon Sep 17 00:00:00 2001
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From: Tejun Heo <tj@kernel.org>
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Date: Thu, 27 Jan 2022 06:25:31 -1000
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Subject: [PATCH 2/3] biolatpcts: Build fixes on recent kernels
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* `struct request` definition recently moved from blkdev.h to blk-mq.h
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breaking both tools/biolatpcts and examples/tracing/biolatpcts. Fix them
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by also including blk-mq.h.
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* blk_account_io_done() got split into two parts - inline condition checks
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and the actual accounting with the latter now done in
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__blk_account_io_done(). The kprobe attachment needs to be conditionalized
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to work across the change. tools/biolatpcts was already updated but
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examples/tracing/biolatpcts wasn't. Fix it.
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Signed-off-by: Tejun Heo <tj@kernel.org>
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---
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examples/tracing/biolatpcts.py | 6 +++++-
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tools/biolatpcts.py | 1 +
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2 files changed, 6 insertions(+), 1 deletion(-)
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diff --git a/examples/tracing/biolatpcts.py b/examples/tracing/biolatpcts.py
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index c9bb834e..68a59516 100755
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--- a/examples/tracing/biolatpcts.py
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+++ b/examples/tracing/biolatpcts.py
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@@ -11,6 +11,7 @@ from time import sleep
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bpf_source = """
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#include <linux/blk_types.h>
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+#include <linux/blk-mq.h>
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#include <linux/blkdev.h>
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#include <linux/time64.h>
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@@ -45,7 +46,10 @@ void kprobe_blk_account_io_done(struct pt_regs *ctx, struct request *rq, u64 now
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"""
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bpf = BPF(text=bpf_source)
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-bpf.attach_kprobe(event='blk_account_io_done', fn_name='kprobe_blk_account_io_done')
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+if BPF.get_kprobe_functions(b'__blk_account_io_done'):
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+ bpf.attach_kprobe(event="__blk_account_io_done", fn_name="kprobe_blk_account_io_done")
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+else:
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+ bpf.attach_kprobe(event="blk_account_io_done", fn_name="kprobe_blk_account_io_done")
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cur_lat_100ms = bpf['lat_100ms']
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cur_lat_1ms = bpf['lat_1ms']
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diff --git a/tools/biolatpcts.py b/tools/biolatpcts.py
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index a2f59592..0f334419 100755
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--- a/tools/biolatpcts.py
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+++ b/tools/biolatpcts.py
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@@ -56,6 +56,7 @@ parser.add_argument('--verbose', '-v', action='count', default = 0)
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bpf_source = """
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#include <linux/blk_types.h>
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#include <linux/blkdev.h>
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+#include <linux/blk-mq.h>
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#include <linux/time64.h>
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BPF_PERCPU_ARRAY(rwdf_100ms, u64, 400);
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--
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2.35.1
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