<div dir="ltr">Wow! I'm glad to see so few code changes were necessary.  I'll give the code a spin this weekend.  This will really help in experimentation.</div><div class="gmail_extra"><br><br><div class="gmail_quote">
On Thu, May 30, 2013 at 5:44 AM, Björn Brandenburg <span dir="ltr"><<a href="mailto:bbb@mpi-sws.org" target="_blank">bbb@mpi-sws.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="word-wrap:break-word"><div class="im"><div><div>On Apr 23, 2013, at 6:18 PM, Christopher Kenna <<a href="mailto:cjk@cs.unc.edu" target="_blank">cjk@cs.unc.edu</a>> wrote:</div><br><blockquote type="cite">
<span style="font-family:Helvetica;font-size:medium;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;display:inline!important;float:none">On Mon, Apr 22, 2013 at 11:55 PM, Björn Brandenburg <</span><a href="mailto:bbb@mpi-sws.org" style="font-family:Helvetica;font-size:medium;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px" target="_blank">bbb@mpi-sws.org</a><span style="font-family:Helvetica;font-size:medium;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;display:inline!important;float:none">> wrote:</span><br style="font-family:Helvetica;font-size:medium;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">
<blockquote type="cite" style="font-family:Helvetica;font-size:medium;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">
Thanks a lot for the pointers! How about this function?<br><br>       <a href="http://lxr.linux.no/linux+v3.0/mm/vmalloc.c#L1680" target="_blank">http://lxr.linux.no/linux+v3.0/mm/vmalloc.c#L1680</a><br><br>>From the inline documentation, it doesn't sound like there's a limit on the maximum vmalloc() allocation. We don't care whether it is expensive or not; it's a one-time thing anyways.<br>
</blockquote><br style="font-family:Helvetica;font-size:medium;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">
<span style="font-family:Helvetica;font-size:medium;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;display:inline!important;float:none">I'm no expert, but it seems reasonable. It looks like it does</span><br style="font-family:Helvetica;font-size:medium;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">
<span style="font-family:Helvetica;font-size:medium;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;display:inline!important;float:none">something similar (eventually calling map_vm_area, like the other</span><br style="font-family:Helvetica;font-size:medium;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">
<span style="font-family:Helvetica;font-size:medium;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;display:inline!important;float:none">function), but also calls kzalloc/kmalloc so that you don't have to</span><br style="font-family:Helvetica;font-size:medium;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">
<span style="font-family:Helvetica;font-size:medium;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;display:inline!important;float:none">worry about allocating/tracking your own pages. Glenn might be</span><br style="font-family:Helvetica;font-size:medium;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">
<span style="font-family:Helvetica;font-size:medium;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;display:inline!important;float:none">interested in the 'node' parameter, too.</span></blockquote>
</div><br></div><div>I've coded this up. Please have a look at commit</div><div><br></div><div><span style="white-space:pre-wrap">    </span><a href="https://github.com/LITMUS-RT/litmus-rt/commit/3ffc3fca3bc90d0603454ce3a7f3d3af50d74aab" target="_blank">https://github.com/LITMUS-RT/litmus-rt/commit/3ffc3fca3bc90d0603454ce3a7f3d3af50d74aab</a></div>
<div><br></div><div>in branch prop/large-trace-buffers.</div><div><br></div><div>I've done some small-scale testing in KVM and it seems to work. Glenn, please give it a try if you get a chance.</div><div><br></div><div>
Thanks,</div><div>Björn</div><div><br></div></div><br>_______________________________________________<br>
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<br></blockquote></div><br></div>