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| author | Philippe Mathieu-Daudé <philmd@redhat.com> | 2020-08-21 21:53:46 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2020-09-07 12:23:55 +0200 |
| commit | e266f52cfb77e9fb162d3d02230170a373076d85 (patch) | |
| tree | 9627037cbc0ede537ba6bdef5343ac78a72fb9ca | |
| parent | e4f310fe7f5ed85c96c4a2175ec46054d02e0f81 (diff) | |
| download | qemu-e266f52cfb77e9fb162d3d02230170a373076d85.zip | |
block/nvme: Avoid further processing if trace event not enabled
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>
| -rw-r--r-- | block/nvme.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/block/nvme.c b/block/nvme.c index a2b006be56..4d4f728159 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], |