From: Joerg Roedel <jroedel@suse.de>
To: Chen-Yu Tsai <wens@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable <stable@vger.kernel.org>, Pavel Machek <pavel@denx.de>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: Regression from "mm/vmalloc: Sync unmappings in __purge_vmap_area_lazy()" in stable kernels
Date: Thu, 12 Dec 2019 12:22:40 +0100 [thread overview]
Message-ID: <20191212112240.GI4477@suse.de> (raw)
In-Reply-To: <20191212111911.GH4477@suse.de>
On Thu, Dec 12, 2019 at 12:19:11PM +0100, Joerg Roedel wrote:
> Hi,
>
> On Thu, Dec 12, 2019 at 06:54:12PM +0800, Chen-Yu Tsai wrote:
> > I'd like to report a very severe performance regression due to
> >
> > mm/vmalloc: Sync unmappings in __purge_vmap_area_lazy() in stable kernels
>
> Yes, that is a known problem, with a couple of reports already in the
> past months. And I posted a fix from which I thought it is on its way
> upstream, but apparently its not:
>
> https://lore.kernel.org/lkml/20191009124418.8286-1-joro@8bytes.org/
Ah, I missed that it is in linux-next already. Sorry for the noise.
Joerg
next prev parent reply other threads:[~2019-12-12 11:22 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-12 10:54 Regression from "mm/vmalloc: Sync unmappings in __purge_vmap_area_lazy()" in stable kernels Chen-Yu Tsai
2019-12-12 11:19 ` Joerg Roedel
2019-12-12 11:22 ` Joerg Roedel [this message]
2019-12-12 11:19 ` Greg Kroah-Hartman
2019-12-12 11:31 ` Chen-Yu Tsai
2019-12-12 12:19 ` Greg Kroah-Hartman
2019-12-13 18:57 ` Pavel Machek
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