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| author | Paolo Bonzini <pbonzini@redhat.com> | 2014-12-02 12:05:44 +0100 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2015-01-13 13:43:28 +0000 |
| commit | d1d1b206b07977fe0e75b0254e5b50c215c97803 (patch) | |
| tree | 2926e9c04304e3ef1d016a84152a3e27cd486fc1 /util | |
| parent | bc521696607c5348fcd8a9e57b408d0ac0dbe2f8 (diff) | |
coroutine-ucontext: use __thread
ELF thread local storage is about 10% faster on tests/test-coroutine's
perf/cost test. The timing on my machine is 190ns per iteration with
pthread TLS, 170 with ELF TLS.
Based on a patch by Kevin Wolf and Peter Lieven, but redone to follow
the model of coroutine-win32.c (including the important "noinline"
attribute!).
Platforms without thread-local storage (OpenBSD probably?) will need
a new-enough GCC for this to compile, in order to use the same emutls
support that Windows already relies on.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-id: 1417518350-6167-2-git-send-email-pbonzini@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'util')
0 files changed, 0 insertions, 0 deletions