* [PATCH] nvme-pci: trigger disk activity LED
@ 2022-02-27 23:42 Enzo Matsumiya
2022-02-28 9:22 ` Christoph Hellwig
0 siblings, 1 reply; 3+ messages in thread
From: Enzo Matsumiya @ 2022-02-27 23:42 UTC (permalink / raw)
To: linux-nvme
Cc: Enzo Matsumiya, Keith Busch, Jens Axboe, Christoph Hellwig,
Sagi Grimberg, linux-kernel, GNU/Weeb Mailing List
Users can enable an LED to indicate I/O activity on NVMe PCIe devices:
# echo "disk-activity" > /sys/class/leds/<led>/trigger
for the composite activity, or disk-{read,write} for individual
activities/LEDs.
Signed-off-by: Enzo Matsumiya <[email protected]>
---
drivers/nvme/host/pci.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 6a99ed680915..3e49d5980beb 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -15,6 +15,7 @@
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
+#include <linux/leds.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/mutex.h>
@@ -1037,6 +1038,8 @@ static __always_inline void nvme_pci_unmap_rq(struct request *req)
rq_integrity_vec(req)->bv_len, rq_data_dir(req));
if (blk_rq_nr_phys_segments(req))
nvme_unmap_data(dev, req);
+
+ ledtrig_disk_activity(req_op(req) == REQ_OP_WRITE);
}
static void nvme_pci_complete_rq(struct request *req)
--
2.34.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] nvme-pci: trigger disk activity LED
2022-02-27 23:42 [PATCH] nvme-pci: trigger disk activity LED Enzo Matsumiya
@ 2022-02-28 9:22 ` Christoph Hellwig
2022-02-28 13:58 ` Jens Axboe
0 siblings, 1 reply; 3+ messages in thread
From: Christoph Hellwig @ 2022-02-28 9:22 UTC (permalink / raw)
To: Enzo Matsumiya
Cc: linux-nvme, Keith Busch, Jens Axboe, Christoph Hellwig,
Sagi Grimberg, linux-kernel, GNU/Weeb Mailing List
I don't think we should add code to the absolutel fast path for
blinkenlights.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] nvme-pci: trigger disk activity LED
2022-02-28 9:22 ` Christoph Hellwig
@ 2022-02-28 13:58 ` Jens Axboe
0 siblings, 0 replies; 3+ messages in thread
From: Jens Axboe @ 2022-02-28 13:58 UTC (permalink / raw)
To: Christoph Hellwig, Enzo Matsumiya
Cc: linux-nvme, Keith Busch, Jens Axboe, Sagi Grimberg, linux-kernel,
GNU/Weeb Mailing List
On 2/28/22 2:22 AM, Christoph Hellwig wrote:
> I don't think we should add code to the absolutel fast path for
> blinkenlights.
Agree. It'd be a lot better to put the cost on the led trigger
side, and not need anything in the fast path for block devices.
Monitor disk stats, or something like that.
--
Jens Axboe
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2022-02-28 13:59 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2022-02-27 23:42 [PATCH] nvme-pci: trigger disk activity LED Enzo Matsumiya
2022-02-28 9:22 ` Christoph Hellwig
2022-02-28 13:58 ` Jens Axboe
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