Date: Tue, 25 Oct 2011 18:09:12 +0000 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: John Baldwin <jhb@freebsd.org> Cc: freebsd-current@freebsd.org, Luigi Rizzo <rizzo@iet.unipi.it> Subject: Re: getting the cpuid for a userspace process ? Message-ID: <99483.1319566152@critter.freebsd.dk> In-Reply-To: Your message of "Tue, 25 Oct 2011 13:42:45 -0400." <201110251342.45194.jhb@freebsd.org>
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In message <201110251342.45194.jhb@freebsd.org>, John Baldwin writes: >On Tuesday, October 25, 2011 11:06:22 am Luigi Rizzo wrote: >> as the subject says... is there any way to get the current >> CPU id for a userspace process (of course, >> valid only at the time the function is called as the >> process might be arbitrarily moved while it runs) > >Not from userland, no. On x86 you can use cpuid to fetch the APIC ID, but >that does not map 1:1 to FreeBSD cpu IDs. How does JEmalloc do it ? -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.
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