[RFC PATCH] uprobes: copy to user-space xol page with proper cache flushing

Oleg Nesterov oleg at redhat.com
Fri Apr 11 11:36:19 PDT 2014

On 04/11, Victor Kamensky wrote:
> On 11 April 2014 11:02, David Miller <davem at davemloft.net> wrote:
> But in uprobes case xol slot where instruction write happened will be
> used only by current CPU. The way I read uprobes code other core
> when it hit the same uprobe address will use different xol slot. Xol slot
> size is cache line so it will not be moved around.


> So as long as we
> know for sure that while tasks performs single step on uprobe xol
> area instruction it won't be migrated to another core we don't need to
> do broadcast to any other cores.

It can migrate to another CPU before it does single-step.


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