From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
David Rientjes <rientjes@google.com>,
Andrea Arcangeli <aarcange@redhat.com>,
linux-mm@kvack.org
Subject: Re: [PATCH] thp: do not adjust zone water marks if khugepaged is not started
Date: Thu, 2 Apr 2015 15:08:24 +0300 [thread overview]
Message-ID: <20150402120824.GC24028@node.dhcp.inet.fi> (raw)
In-Reply-To: <20150327150026.7500f1081e8c30c2303afecd@linux-foundation.org>
On Fri, Mar 27, 2015 at 03:00:26PM -0700, Andrew Morton wrote:
> On Fri, 27 Mar 2015 14:47:08 -0700 Andrew Morton <akpm@linux-foundation.org> wrote:
>
> > Fair enough, but take a look at start_khugepaged():
> >
> > : static int start_khugepaged(void)
> > : {
> > : int err = 0;
> > : if (khugepaged_enabled()) {
> > : if (!khugepaged_thread)
> > : khugepaged_thread = kthread_run(khugepaged, NULL,
> > : "khugepaged");
> > : if (unlikely(IS_ERR(khugepaged_thread))) {
> > : pr_err("khugepaged: kthread_run(khugepaged) failed\n");
> > : err = PTR_ERR(khugepaged_thread);
> > : khugepaged_thread = NULL;
> >
> > -->> stop here
> >
> > : }
> > :
> > : if (!list_empty(&khugepaged_scan.mm_head))
> > : wake_up_interruptible(&khugepaged_wait);
> > :
> > : set_recommended_min_free_kbytes();
> > : } else if (khugepaged_thread) {
> > : kthread_stop(khugepaged_thread);
> > : khugepaged_thread = NULL;
> > : }
> > :
> > : return err;
> > : }
>
> Looking more closely... This code seems a bit screwy.
>
> - why is set_recommended_min_free_kbytes() a late_initcall? We've
> already done that within
> subsys_initcall->hugepage_init->set_recommended_min_free_kbytes()
>
> - there isn't much point in running start_khugepaged() if we've just
> set transparent_hugepage_flags to zero.
>
> - start_khugepaged() is misnamed.
>
> So something like this?
Looks like you didn't apply this. Here's proper patch:
next prev parent reply other threads:[~2015-04-02 12:08 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-27 11:39 [PATCH] thp: do not adjust zone water marks if khugepaged is not started Kirill A. Shutemov
2015-03-27 21:47 ` Andrew Morton
2015-03-27 22:00 ` Andrew Morton
2015-03-27 22:08 ` Kirill A. Shutemov
2015-04-02 12:08 ` Kirill A. Shutemov [this message]
2015-03-27 22:00 ` Kirill A. Shutemov
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