Re: [PATCH] brd: expose number of allocated pages in debugfs

On 4/16/21 3:18 PM, Saravanan D wrote:

From: Calvin Owens <redacted>

While the maximum size of each ramdisk is defined either
as a module parameter, or compile time default, it's impossible
to know how many pages have currently been allocated by each
ram%d device, since they're allocated when used and never freed.

This patch creates a new directory at this location:

»       /sys/kernel/debug/ramdisk_pages/

...which will contain a file named "ram%d" for each instantiated
ramdisk on the system. The file is read-only, and read() will
output the number of pages currently held by that ramdisk.

I folded in the justification and applied it for 5.13, thanks.

-- 
Jens Axboe