linux-kernel - Re: [v4 2/3] mm: Defer TLB flush by keeping both src and dst folios at migration

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Message-ID: <20240115075535.GA56305@system.software.com>
Date: Mon, 15 Jan 2024 16:55:35 +0900
From: Byungchul Park <byungchul@...com>
To: Matthew Wilcox <willy@...radead.org>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	kernel_team@...ynix.com, akpm@...ux-foundation.org,
	ying.huang@...el.com, namit@...are.com, xhao@...ux.alibaba.com,
	mgorman@...hsingularity.net, hughd@...gle.com, david@...hat.com,
	peterz@...radead.org, luto@...nel.org, tglx@...utronix.de,
	mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com
Subject: Re: [v4 2/3] mm: Defer TLB flush by keeping both src and dst folios
 at migration

On Thu, Nov 09, 2023 at 02:36:01PM +0000, Matthew Wilcox wrote:
> On Thu, Nov 09, 2023 at 01:59:07PM +0900, Byungchul Park wrote:
> > +++ b/include/linux/page-flags.h
> > @@ -136,6 +136,7 @@ enum pageflags {
> >  	PG_arch_2,
> >  	PG_arch_3,
> >  #endif
> > +	PG_migrc,		/* Page is under migrc's control */
> >  	__NR_PAGEFLAGS,
> 
> Yeah; no.  We're out of page flags.  And CXL is insufficiently

I won't use an additional page flag any more.

Thanks.
	Byungchul