On Tue, Mar 03, 2020 at 10:26:21AM +0100, Miklos Szeredi wrote:

No, I don't think this is going to be a performance issue at all, but
if anything we could introduce a syscall

  ssize_t readfile(int dfd, const char *path, char *buf, size_t
bufsize, int flags);

off-topic, but I'll buy you many many beers if you implement it ;-),
because open + read + close is pretty common for /sys and /proc in
many userspace tools; for example ps, top, lsblk, lsmem, lsns, udevd
etc. is all about it.

    Karel

-- 
 Karel Zak  [off-list ref]
 http://karelzak.blogspot.com