linux-kernel - Re: [PATCH V2 2/2] mm: compaction: Limit the value of interface compact

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Date:   Wed, 8 Mar 2023 14:23:07 -0800
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     ye.xingchen@....com.cn, keescook@...omium.org, yzaikin@...gle.com,
        akpm@...ux-foundation.org, linmiaohe@...wei.com,
        chi.minghao@....com.cn, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH V2 2/2] mm: compaction: Limit the value of interface
 compact_memory

On Wed, Mar 08, 2023 at 10:54:31PM +0100, Vlastimil Babka wrote:
> On 3/8/23 20:57, Luis Chamberlain wrote:
> > On Wed, Mar 08, 2023 at 11:23:45AM +0100, Vlastimil Babka wrote:
> >> >  {
> >> > -	if (write)
> >> > +	int ret;
> >> > +
> >> > +	ret = proc_dointvec_minmax(table, write, buffer, length, ppos);
> >> > +	if (ret)
> >> > +		return ret;
> >> > +	if (write) {
> >> > +		pr_info("compact_nodes start\n");
> >> >  		compact_nodes();
> >> > +		pr_info("compact_nodes end\n");
> >> 
> >> I'm not sure we want to start spamming the dmesg. This would make sense
> >> if we wanted to deprecate the sysctl and start hunting for remaining
> >> callers to be fixed. Otherwise ftrace can be used to capture e.g. the time.
> > 
> > Without that print, I don't think a custom proc handler is needed too,
> > right? So what would simplify the code.
> 
> But we'd still call compact_nodes(), so that's not possible without a custom
> handler, no?

Ah right. It does beg the question if that form is common, so to define one.
But that's just extra work not needed now.

  Luis