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42 lines
1.5 KiB
42 lines
1.5 KiB
Downstream-only patch to disable rseq by default. This is necessary |
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because CRIU does not yet support rseq: |
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criu: Implement rseq support |
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<https://bugzilla.redhat.com/show_bug.cgi?id=2033446> |
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diff --git a/manual/tunables.texi b/manual/tunables.texi |
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index 28ff502990c2a10f..f559c44dcec4624b 100644 |
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--- a/manual/tunables.texi |
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+++ b/manual/tunables.texi |
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@@ -425,11 +425,13 @@ The value is measured in bytes. The default is @samp{41943040} |
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@end deftp |
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@deftp Tunable glibc.pthread.rseq |
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-The @code{glibc.pthread.rseq} tunable can be set to @samp{0}, to disable |
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-restartable sequences support in @theglibc{}. This enables applications |
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-to perform direct restartable sequence registration with the kernel. |
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-The default is @samp{1}, which means that @theglibc{} performs |
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-registration on behalf of the application. |
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+The @code{glibc.pthread.rseq} tunable can be set to @samp{1}, to enable |
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+restartable sequences support. @Theglibc{} uses this to optimize the |
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+@code{sched_getcpu} function. |
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+ |
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+The default is @samp{0}, which means that applications can perform |
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+restartable sequences registration, but @code{sched_getcpu} is not |
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+accelerated. |
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Restartable sequences are a Linux-specific extension. |
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@end deftp |
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diff --git a/sysdeps/nptl/dl-tunables.list b/sysdeps/nptl/dl-tunables.list |
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index d24f4be0d08ba407..df2a39ce01858d3b 100644 |
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--- a/sysdeps/nptl/dl-tunables.list |
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+++ b/sysdeps/nptl/dl-tunables.list |
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@@ -31,7 +31,7 @@ glibc { |
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type: INT_32 |
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minval: 0 |
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maxval: 1 |
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- default: 1 |
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+ default: 0 |
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} |
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} |
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}
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