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[PATCH v5 02/15] block/nvme: Avoid further processing if trace event not
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From: |
Philippe Mathieu-Daudé |
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Subject: |
[PATCH v5 02/15] block/nvme: Avoid further processing if trace event not enabled |
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Date: |
Thu, 20 Aug 2020 18:58:48 +0200 |
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>
---
block/nvme.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/block/nvme.c b/block/nvme.c
index 2f5e3c2adfa..8c30a5fee28 100644
--- a/block/nvme.c
+++ b/block/nvme.c
@@ -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],
--
2.26.2