liblitmus.git/include/migration.h, branch ecrts14-pgm-final [ARCHIVE] The userspace library for LITMUS^RT 2010. Now on GitHub. Use /proc/litmus/domains to set up affinity masks. 2014-02-05T05:34:37+00:00 Glenn Elliott gelliott@cs.unc.edu 2014-02-05T05:31:08+00:00 81c3862197756046eee4a2dd9114fa7ccedf5b85 This patch replaces the algorithm used to compute CPU affinity masks. The old algorithm was fragile and would break on systems with multiple levels of shared caches. (As found on some older Intel chips, and as one would probably find on a system with hyper-threading enabled.) The bug stems from fact that Linux enumerates consecutive CPUs in a way that distributes them across the physical system, thereby reducing contention resources (e.g., cache). 
This patch replaces the algorithm used to compute
CPU affinity masks. The old algorithm was fragile
and would break on systems with multiple levels
of shared caches. (As found on some older Intel
chips, and as one would probably find on a system
with hyper-threading enabled.) The bug stems from
fact that Linux enumerates consecutive CPUs in a way
that distributes them across the physical system,
thereby reducing contention resources (e.g., cache).
Auto-CPU-affinity from part./cluster assignment. 2013-03-12T16:02:20+00:00 Glenn Elliott gelliott@cs.unc.edu 2013-03-12T15:57:42+00:00 93ffe5be8fd1954bbfe5a04e55b81ac1d83d2de7 This patch replaces be_migrate_to() with several be_migrate_*() APIs to automatically assign CPU affinity masks from a task's partition (or cluster) assignment. Routines are release-master-aware such that the release master (if one exists) will NOT be included in the task's affinity mask. (Note that release-master avoidance may be overridden by calling __be_migrate_thread_to_cluster().) 
This patch replaces be_migrate_to() with several
be_migrate_*() APIs to automatically assign CPU affinity
masks from a task's partition (or cluster) assignment.
Routines are release-master-aware such that the release
master (if one exists) will NOT be included in the
task's affinity mask. (Note that release-master
avoidance may be overridden by calling
__be_migrate_thread_to_cluster().)