lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Message-ID: <1496356439.7171.73.camel@redhat.com>
Date:   Thu, 01 Jun 2017 18:33:59 -0400
From:   Doug Ledford <dledford@...hat.com>
To:     Qing Huang <qing.huang@...cle.com>, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     sean.hefty@...el.com, artemyko@...lanox.com
Subject: Re: [PATCH] ib/core: not to set page dirty bit if it's already set.

On Thu, 2017-05-18 at 16:33 -0700, Qing Huang wrote:
> This change will optimize kernel memory deregistration operations.
> __ib_umem_release() used to call set_page_dirty_lock() against every
> writable page in its memory region. Its purpose is to keep data
> synced between CPU and DMA device when swapping happens after mem
> deregistration ops. Now we choose not to set page dirty bit if it's
> already set by kernel prior to calling __ib_umem_release(). This
> reduces memory deregistration time by half or even more when we ran
> application simulation test program.
> 
> Signed-off-by: Qing Huang <qing.huang@...cle.com>

Thanks, applied.

-- 
Doug Ledford <dledford@...hat.com>
    GPG KeyID: B826A3330E572FDD
   
Key fingerprint = AE6B 1BDA 122B 23B4 265B  1274 B826 A333 0E57 2FDD

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ