38 lines
1.2 KiB
Diff
38 lines
1.2 KiB
Diff
From ac416ab67cd7add0089c3bc668427e6b909eb59e Mon Sep 17 00:00:00 2001
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From: Jeff Mahoney <jeffm@suse.com>
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Date: Thu, 21 Oct 2021 10:16:19 -0400
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Subject: [PATCH 2/5] blkparse: skip check_cpu_map with pipe input
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When we're using pipe input, we don't track online CPUs and don't have a
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cpu_map. When we start to show entries, check_sequence will be invoked.
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If the first entry isn't sequence 1 (perhaps it's been dropped?), we'll
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proceed to check_cpu_map. Since we haven't tracked online CPUs,
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pdi->cpu_map_max will be 0 and we'll do a malloc(0). Then we'll start
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setting bits corresponding to CPU numbers in memory we don't own. Since
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there's nothing to check here, let's skip it on pipe input.
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Signed-off-by: Jeff Mahoney <jeffm@suse.com>
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Signed-off-by: Jens Axboe <axboe@kernel.dk>
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---
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blkparse.c | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/blkparse.c b/blkparse.c
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index f88204a..498857c 100644
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--- a/blkparse.c
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+++ b/blkparse.c
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@@ -2229,6 +2229,10 @@ static int check_cpu_map(struct per_dev_info *pdi)
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unsigned int i;
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int ret, cpu;
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+ /* Pipe input doesn't do CPU online tracking. */
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+ if (!pdi->cpu_map_max)
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+ return 0;
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+
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/*
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* create a map of the cpus we have traces for
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*/
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--
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2.33.0
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