linux-kernel - Re: [PATCH TTY] memcg: drop GFP_KERNEL_ACCOUNT use in tty_save

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Message-ID: <YP/Sl8a5PqUFZAi5@kroah.com>
Date:   Tue, 27 Jul 2021 11:32:07 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Vasily Averin <vvs@...tuozzo.com>
Cc:     Jiri Slaby <jirislaby@...nel.org>, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH TTY] memcg: drop GFP_KERNEL_ACCOUNT use in
 tty_save_termios()

On Tue, Jul 27, 2021 at 12:26:12PM +0300, Vasily Averin wrote:
> Jiri Slaby pointed that termios are not saved for PTYs and for other
> terminals used inside containers. Therefore accounting for saved
> termios have near to zero impact in real life scenarios.
> 
> Cc: Jiri Slaby <jirislaby@...nel.org>
> Fixes: 854dd8a572a0 ("memcg: enable accounting for tty-related objects")
> Signed-off-by: Vasily Averin <vvs@...tuozzo.com>
> ---
>  drivers/tty/tty_io.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
> index e787f6f..a6230b2 100644
> --- a/drivers/tty/tty_io.c
> +++ b/drivers/tty/tty_io.c
> @@ -1493,7 +1493,7 @@ void tty_save_termios(struct tty_struct *tty)
>  	/* Stash the termios data */
>  	tp = tty->driver->termios[idx];
>  	if (tp == NULL) {
> -		tp = kmalloc(sizeof(*tp), GFP_KERNEL_ACCOUNT);
> +		tp = kmalloc(sizeof(*tp), GFP_KERNEL);
>  		if (tp == NULL)
>  			return;
>  		tty->driver->termios[idx] = tp;
> -- 
> 1.8.3.1
> 

I can just drop the original patch from my tree, it has not gone into my
unmutable branch yet.

thanks,

greg k-h