On Mon, Oct 10, 2022 at 12:20 AM Christoph Hellwig [off-list ref] wrote:

On Tue, Oct 04, 2022 at 04:15:20PM -0700, Khazhy Kumykov wrote:

quoted

The kernel already picks and hardcodes a default scheduler, my
thinking is: why not let folks choose? This was allowed in the old
block layer since 2005.

You can choose it using CONFIG_CMDLINE.  We can't add a config option
for every bloody default as that simply does not scale.

Are you referring to elevator=? It looks like that needs to be
re-wired for blk-mq, but seems like a reasonable solution. I'll send a
new patch out.

Thanks,
Khazhy