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block/nvme: Avoid further processing if trace event not enabled

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Avoid further processing if TRACE_NVME_SUBMIT_COMMAND_RAW is
not enabled. This is an untested intend of performance optimization.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200821195359.1285345-3-philmd@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Philippe Mathieu-Daudé 2020-08-21 21:53:46 +02:00 committed by Kevin Wolf
parent e4f310fe7f
commit e266f52cfb
1 changed files with 3 additions and 0 deletions
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3
block/nvme.c
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@ -441,6 +441,9 @@ static void nvme_trace_command(const NvmeCmd *cmd)
{
int i;
if (!trace_event_get_state_backends(TRACE_NVME_SUBMIT_COMMAND_RAW)) {
return;
}
for (i = 0; i < 8; ++i) {
uint8_t *cmdp = (uint8_t *)cmd + i * 8;
trace_nvme_submit_command_raw(cmdp[0], cmdp[1], cmdp[2], cmdp[3],