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From: Minchan Kim <minchan@kernel.org>
To: Vlastimil Babka <vbabka@suse.cz>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	LKML <linux-kernel@vger.kernel.org>,
	linux-mm <linux-mm@kvack.org>,
	linux-api@vger.kernel.org, oleksandr@redhat.com,
	Suren Baghdasaryan <surenb@google.com>,
	Tim Murray <timmurray@google.com>,
	Daniel Colascione <dancol@google.com>,
	Sandeep Patil <sspatil@google.com>,
	Sonny Rao <sonnyrao@google.com>,
	Brian Geffon <bgeffon@google.com>, Michal Hocko <mhocko@suse.com>,
	Johannes Weiner <hannes@cmpxchg.org>,
	Shakeel Butt <shakeelb@google.com>,
	John Dias <joaodias@google.com>,
	Joel Fernandes <joel@joelfernandes.org>,
	Jann Horn <jannh@google.com>,
	alexander.h.duyck@linux.intel.com, sj38.park@gmail.com
Subject: Re: [PATCH v7 2/7] mm: introduce external memory hinting API
Date: Tue, 10 Mar 2020 15:20:08 -0700	[thread overview]
Message-ID: <20200310222008.GB72963@google.com> (raw)
In-Reply-To: <bc3f6bd5-f032-bcf5-a09f-556ab785c587@suse.cz>

On Thu, Mar 05, 2020 at 07:15:10PM +0100, Vlastimil Babka wrote:
> On 3/2/20 8:36 PM, Minchan Kim wrote:
> > There is usecase that System Management Software(SMS) want to give
> > a memory hint like MADV_[COLD|PAGEEOUT] to other processes and
> > in the case of Android, it is the ActivityManagerService.
> > 
> > It's similar in spirit to madvise(MADV_WONTNEED), but the information
> 
> You mean MADV_DONTNEED?

Mean to DONT_NEED's future version.

> 
> > required to make the reclaim decision is not known to the app.
> 
> This seems to be mixing up the differences between MADV_DONTNEED and
> COLD/PAGEOUT and self-imposed vs external memory hints?

Sorry, I don't understand what you want here.

> 
> > Instead,
> > it is known to the centralized userspace daemon(ActivityManagerService),
> > and that daemon must be able to initiate reclaim on its own without
> > any app involvement.
> > 
> > To solve the issue, this patch introduces a new syscall process_madvise(2).
> > It uses pidfd of an external process to give the hint.
> > 
> >  int process_madvise(int pidfd, void *addr, size_t length, int advise,
> > 			unsigned long flag);
> 
> It's more common to call the argument 'flags' not 'flag'? The code seems to call
> it flags. Also in line with madvise(2), the 'advise' argument should rather be
> 'advice'. This is more important for the manpage, but let's be consistent.

Yub, I will send the patch along with your comment in previous patch.

> 
> ...
> 
> > 
> > Reviewed-by: Suren Baghdasaryan <surenb@google.com>
> > Signed-off-by: Minchan Kim <minchan@kernel.org>
> 
> For the core parts,
> Reviewed-by: Vlastimil Babka <vbabka@suse.cz>

Thanks for the review!


  reply	other threads:[~2020-03-10 22:20 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-02 19:36 [PATCH v7 0/7] introduce memory hinting API for external process Minchan Kim
2020-03-02 19:36 ` [PATCH v7 1/7] mm: pass task and mm to do_madvise Minchan Kim
2020-03-05 15:48   ` Vlastimil Babka
2020-05-08 18:21     ` Minchan Kim
2020-03-02 19:36 ` [PATCH v7 2/7] mm: introduce external memory hinting API Minchan Kim
2020-03-03 10:33   ` kbuild test robot
2020-03-03 14:57     ` Minchan Kim
2020-03-05 18:15   ` Vlastimil Babka
2020-03-10 22:20     ` Minchan Kim [this message]
2020-03-11  0:36       ` Minchan Kim
2020-03-12 12:40       ` Vlastimil Babka
2020-03-12 20:23         ` Minchan Kim
2020-05-08 18:33           ` Minchan Kim
2020-03-02 19:36 ` [PATCH v7 3/7] mm: check fatal signal pending of target process Minchan Kim
2020-03-06 10:22   ` Vlastimil Babka
2020-03-10 22:24     ` Minchan Kim
2020-03-02 19:36 ` [PATCH v7 4/7] pid: move pidfd_get_pid function to pid.c Minchan Kim
2020-03-06 10:57   ` Vlastimil Babka
2020-03-06 11:14   ` Christian Brauner
2020-03-02 19:36 ` [PATCH v7 5/7] mm: support both pid and pidfd for process_madvise Minchan Kim
2020-03-06 11:14   ` Vlastimil Babka
2020-03-11  0:42     ` Minchan Kim
2020-05-08 18:36       ` Minchan Kim
2020-05-08 23:04         ` Andrew Morton
2020-05-09 12:48           ` Christian Brauner
2020-05-09 23:14             ` Minchan Kim
2020-05-12 19:55               ` Suren Baghdasaryan
2020-03-02 19:36 ` [PATCH v7 6/7] mm/madvise: employ mmget_still_valid for write lock Minchan Kim
2020-03-06 12:52   ` Vlastimil Babka
2020-03-06 13:03     ` Oleksandr Natalenko
2020-03-06 16:03       ` Vlastimil Babka
2020-03-09 12:30         ` Oleksandr Natalenko
2020-03-10 22:28           ` Minchan Kim
2020-03-02 19:36 ` [PATCH v7 7/7] mm/madvise: allow KSM hints for remote API Minchan Kim
2020-03-06 13:13   ` Vlastimil Babka
2020-03-06 13:41     ` Oleksandr Natalenko
2020-03-06 16:08       ` Vlastimil Babka
2020-03-09 13:11         ` Oleksandr Natalenko
2020-03-09 15:08           ` Michal Hocko
2020-03-09 15:19             ` Oleksandr Natalenko
2020-03-09 15:42               ` Vlastimil Babka
2020-03-09 16:03                 ` Michal Hocko
2020-06-11  2:21   ` Jann Horn
2020-03-02 21:16 ` [PATCH v7 0/7] introduce memory hinting API for external process Andrew Morton
2020-03-02 21:42   ` Minchan Kim

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