From: Keith Busch <keith.busch@intel.com>
To: Jon Derrick <jonathan.derrick@intel.com>
Cc: helgaas@kernel.org, linux-pci@vger.kernel.org
Subject: Re: [PATCHv2] PCI/VMD: Use SRCU as a local RCU to prevent delaying global RCU
Date: Fri, 11 Nov 2016 18:28:38 -0500 [thread overview]
Message-ID: <20161111232838.GD10660@localhost.localdomain> (raw)
In-Reply-To: <1478905725-219032-1-git-send-email-jonathan.derrick@intel.com>
On Fri, Nov 11, 2016 at 04:08:45PM -0700, Jon Derrick wrote:
> SRCU lets synchronize_srcu depend on VMD-local RCU primitives,
> preventing long delays from locking up RCU in other systems. VMD
> performs a synchronize when removing a device, but will hit all irq
> lists if the device uses all VMD vectors. This patch will not help VMD's
> RCU synchronization, but will isolate the read side delays to the VMD
> subsystem. Additionally, the use of SRCU in VMD's isr will keep it
> isolated from any other RCU waiters in the rest of the system.
Looks good.
Reviewed-by: Keith Busch <keith.busch@intel.com>
next prev parent reply other threads:[~2016-11-11 23:28 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-11 23:08 [PATCHv2] PCI/VMD: Use SRCU as a local RCU to prevent delaying global RCU Jon Derrick
2016-11-11 23:28 ` Keith Busch [this message]
2016-11-14 22:41 ` Bjorn Helgaas
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