Re: [PATCH 2/3] x86/alternatives: Move tp_vec

From: Peter Zijlstra
Date: Mon Aug 26 2019 - 10:37:06 EST

On Mon, Aug 26, 2019 at 02:51:40PM +0200, Peter Zijlstra wrote:

> +#define TP_VEC_MAX (PAGE_SIZE / sizeof(struct text_poke_loc))
> +extern struct text_poke_loc tp_vec[TP_VEC_MAX];
> +extern int tp_vec_nr;

FWIW, that currently results in a batch size of 128, but I've not
noticed any delay in flipping ftrace on and off on the commandline.

Growing that buffer really shouldn't be a problem, but I'm thinking we'd
want solid performance numbers to justify it.