Messages in this thread | | | Date | Tue, 18 Sep 2007 09:53:03 -0700 | From | Vara Prasad <> | Subject | Re: [PATCH 0/2] A kernel tracing interface |
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David Wilder wrote:
> Andrew Morton wrote: > >> On Thu, 13 Sep 2007 16:43:09 -0700 >> David Wilder <dwilder@us.ibm.com> wrote: >> >>> These patches provide a kernel tracing interface called "trace". >>> >>> The motivation for "trace" is to: >>> - Provide a simple set of tracing primitives that will utilize the >>> high- >>> performance and low-overhead of relayfs for passing traces data from >>> kernel to user space. >>> - Provide a common user interface for managing kernel traces. >>> - Allow for binary as well as ascii trace data. >>> - Incorporate features from the systemtap runtime that are >>> useful to others. >>> >>> History- Versions of this code have been submitted for review under >>> a couple of different names. The original submission was called UTT, >>> it was later re-submitted as GTSC. Christoph Hellwig commented "The >>> code looks fine ...but the name is just dumb". Following Christoph's >>> advice, I changed the name to simply "Trace". >>> >>> This patch addresses review comments made by Christoph Hellwig and >>> Mathieu >>> Desnoyers. Changes include the addition of a mutex and synchronization >>> protecting trace state changes (using RCU) and the reduction of the >>> number of exports. >>> >>> Patches are against 2.6.23-rc4-mm1 >>> >>> Required patches: >>> 1/2 Trace code and documentation >>> 2/2 Relay reset consumed (required for trace's "rewind" feature") >>> >>> Signed-off-by: David Wilder <dwilder@us.ibm.com> >> >> >> Well the code looks neat and easy enough to merge. >> >> What exactly is the relationship between this and systemtap and >> kprobes and >> all the other tracing things which people are doing? >> >> > The key to the relationship is relay. Systemtap, kprobes, blktrace > ,(and others) need the fast user-kernel data hose that relay provides. > Trace is a means to simplify and standardize the use of relay. > Systemtap adopted this code some time ago in its own runtime. Moving > this code into the kernel will allow other tracers to take advantage > of the same trace primitives.
Andrew,
This is part of the effort by the SystemTap team to move pieces of the project that are generic to mainline.
bye, Vara Prasad
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