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[PULL 03/64] block/nvme: Avoid further processing if trace event not ena
From: |
Kevin Wolf |
Subject: |
[PULL 03/64] block/nvme: Avoid further processing if trace event not enabled |
Date: |
Mon, 7 Sep 2020 13:08:35 +0200 |
From: Philippe Mathieu-Daudé <philmd@redhat.com>
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>
---
block/nvme.c | 3 +++
1 file changed, 3 insertions(+)
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],
--
2.25.4
- [PULL 00/64] Block layer patches, Kevin Wolf, 2020/09/07
- [PULL 02/64] block/nvme: Replace magic value by SCALE_MS definition, Kevin Wolf, 2020/09/07
- [PULL 04/64] block/nvme: Let nvme_create_queue_pair() fail gracefully, Kevin Wolf, 2020/09/07
- [PULL 03/64] block/nvme: Avoid further processing if trace event not enabled,
Kevin Wolf <=
- [PULL 01/64] block: Raise an error when backing file parameter is an empty string, Kevin Wolf, 2020/09/07
- [PULL 06/64] block/nvme: Improve error message when IO queue creation failed, Kevin Wolf, 2020/09/07
- [PULL 07/64] block/nvme: Use common error path in nvme_add_io_queue(), Kevin Wolf, 2020/09/07
- [PULL 05/64] block/nvme: Define INDEX macros to ease code review, Kevin Wolf, 2020/09/07
- [PULL 09/64] block/nvme: Use union of NvmeIdCtrl / NvmeIdNs structures, Kevin Wolf, 2020/09/07
- [PULL 10/64] block/nvme: Replace qemu_try_blockalign0 by qemu_try_blockalign/memset, Kevin Wolf, 2020/09/07
- [PULL 11/64] block/nvme: Replace qemu_try_blockalign(bs) by qemu_try_memalign(pg_sz), Kevin Wolf, 2020/09/07
- [PULL 12/64] block/nvme: Simplify nvme_init_queue() arguments, Kevin Wolf, 2020/09/07
- [PULL 13/64] block/nvme: Replace BDRV_POLL_WHILE by AIO_WAIT_WHILE, Kevin Wolf, 2020/09/07
- [PULL 08/64] block/nvme: Rename local variable, Kevin Wolf, 2020/09/07