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 |
93dc2d |
Downstream-only patch to disable rseq by default. This is necessary
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93dc2d |
because CRIU does not yet support rseq:
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93dc2d |
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93dc2d |
criu: Implement rseq support
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93dc2d |
<https://bugzilla.redhat.com/show_bug.cgi?id=2033446>
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93dc2d |
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93dc2d |
diff --git a/manual/tunables.texi b/manual/tunables.texi
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93dc2d |
index 28ff502990c2a10f..f559c44dcec4624b 100644
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93dc2d |
--- a/manual/tunables.texi
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93dc2d |
+++ b/manual/tunables.texi
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93dc2d |
@@ -425,11 +425,13 @@ The value is measured in bytes. The default is @samp{41943040}
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93dc2d |
@end deftp
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93dc2d |
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93dc2d |
@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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93dc2d |
-restartable sequences support in @theglibc{}. This enables applications
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93dc2d |
-to perform direct restartable sequence registration with the kernel.
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93dc2d |
-The default is @samp{1}, which means that @theglibc{} performs
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93dc2d |
-registration on behalf of the application.
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93dc2d |
+The @code{glibc.pthread.rseq} tunable can be set to @samp{1}, to enable
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93dc2d |
+restartable sequences support. @Theglibc{} uses this to optimize the
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93dc2d |
+@code{sched_getcpu} function.
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93dc2d |
+
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93dc2d |
+The default is @samp{0}, which means that applications can perform
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93dc2d |
+restartable sequences registration, but @code{sched_getcpu} is not
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93dc2d |
+accelerated.
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93dc2d |
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93dc2d |
Restartable sequences are a Linux-specific extension.
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93dc2d |
@end deftp
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93dc2d |
diff --git a/sysdeps/nptl/dl-tunables.list b/sysdeps/nptl/dl-tunables.list
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93dc2d |
index d24f4be0d08ba407..df2a39ce01858d3b 100644
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93dc2d |
--- a/sysdeps/nptl/dl-tunables.list
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93dc2d |
+++ b/sysdeps/nptl/dl-tunables.list
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93dc2d |
@@ -31,7 +31,7 @@ glibc {
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93dc2d |
type: INT_32
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93dc2d |
minval: 0
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93dc2d |
maxval: 1
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93dc2d |
- default: 1
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93dc2d |
+ default: 0
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93dc2d |
}
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93dc2d |
}
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93dc2d |
}
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