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refperf: Dynamically allocate thread-summary output buffer

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Currently, the buffer used to accumulate the thread-summary output is
fixed size, which will cause problems if someone decides to run on a large
number of PCUs.  This commit therefore dynamically allocates this buffer.

[ paulmck: Fix memory allocation as suggested by KASAN. ]
Cc: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2020-05-25 17:45:03 -07:00
parent f518f154ec
commit 2e90de76f2
1 changed files with 5 additions and 1 deletions
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6
kernel/rcu/refperf.c
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@ -301,9 +301,12 @@ u64 process_durations(int n)
int i;
struct reader_task *rt;
char buf1[64];
char buf[512];
char *buf;
u64 sum = 0;
buf = kmalloc(128 + nreaders * 32, GFP_KERNEL);
if (!buf)
return 0;
buf[0] = 0;
sprintf(buf, "Experiment #%d (Format: <THREAD-NUM>:<Total loop time in ns>)",
exp_idx);
@ -322,6 +325,7 @@ u64 process_durations(int n)
PERFOUT("%s\n", buf);
kfree(buf);
return sum;
}