From: Lance Yang <ioworker0@gmail.com>
To: Michal Hocko <mhocko@suse.com>
Cc: akpm@linux-foundation.org, zokeefe@google.com, david@redhat.com,
songmuchun@bytedance.com, shy828301@gmail.com,
peterx@redhat.com, minchan@kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/1] mm/khugepaged: bypassing unnecessary scans with MMF_DISABLE_THP check
Date: Tue, 30 Jan 2024 17:46:17 +0800 [thread overview]
Message-ID: <CAK1f24=WJa7qpwBW8J-eYBc2TGrViE_8vtCTESXxMDd=hhQdjw@mail.gmail.com> (raw)
In-Reply-To: <ZbjC7KyI21ik1xpK@tiehlicka>
On Tue, Jan 30, 2024 at 5:35 PM Michal Hocko <mhocko@suse.com> wrote:
>
> On Tue 30-01-24 11:08:10, Lance Yang wrote:
> > On Tue, Jan 30, 2024 at 10:12 AM Lance Yang <ioworker0@gmail.com> wrote:
> > >
> > > Hey Michal,
> > >
> > > Thanks for taking time to review!
> > >
> > > On some servers within our company, we deploy a
> > > daemon responsible for monitoring and updating
> > > local applications. Some applications prefer not to
> > > use THP, so the daemon calls prctl to disable THP
> > > before fork/exec. Conversely, for other applications,
> > > the daemon calls prctl to enable THP before fork/exec.
> > >
> > > Ideally, the daemon should invoke prctl after the fork,
> > > but its current implementation follows the described
> > > approach.
> >
> > In the Go standard library, there is no direct encapsulation
> > of the fork system call. Instead, fork and execve are
> > combined into one through syscall.ForkExec.
>
> OK, this is an important detail. Something that should be a part
> of the chnagelog. It is also important to note that this is not
> a correctness issue but rather an optimization to save expensive
> checks on each VMA when userspace cannot prctl itself before spawning
> into the new process.
Thanks for pointing that out!
I'll include it in the changelog. Good to know it's an optimization
rather than a correctness issue.
Thanks,
Lance
> --
> Michal Hocko
> SUSE Labs
next prev parent reply other threads:[~2024-01-30 9:46 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-29 5:45 [PATCH 1/1] mm/khugepaged: bypassing unnecessary scans with MMF_DISABLE_THP check Lance Yang
2024-01-29 16:28 ` Michal Hocko
2024-01-30 2:12 ` Lance Yang
2024-01-30 3:08 ` Lance Yang
2024-01-30 9:35 ` Michal Hocko
2024-01-30 9:46 ` Lance Yang [this message]
2024-01-31 0:37 ` Lance Yang
2024-01-29 18:53 ` Yang Shi
2024-01-29 19:03 ` Zach O'Keefe
2024-01-30 2:37 ` Lance Yang
2024-01-30 2:21 ` Lance Yang
2024-01-31 9:30 ` Lance Yang
2024-01-31 20:06 ` Yang Shi
2024-02-01 1:13 ` Lance Yang
2024-02-01 18:56 ` Yang Shi
2024-02-03 3:20 ` Lance Yang
2024-02-21 22:11 ` Andrew Morton
2024-02-22 7:43 ` Lance Yang
2024-02-22 7:51 ` Lance Yang
2024-02-22 8:51 ` David Hildenbrand
2024-02-22 9:12 ` Lance Yang
2024-02-22 20:23 ` Yang Shi
2024-02-22 21:11 ` Andrew Morton
2024-02-23 7:59 ` Lance Yang
2024-02-24 1:47 ` Yang Shi
2024-02-24 1:46 ` Yang Shi
2024-02-24 3:54 ` Lance Yang
2024-02-25 4:56 ` Lance Yang
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