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elf: Use new dependency sorting algorithm by default

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The default has to change eventually, and there are no known failures
that require a delay.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Florian Weimer 2021-12-14 12:37:44 +01:00
parent f8392bb766
commit 0884724a95
4 changed files with 7 additions and 6 deletions
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7
NEWS
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@ -60,9 +60,10 @@ Major new features:
of the existing sorting algorithm when encountering particular circular
object dependency cases.
* A new tunable, glibc.rtld.dynamic_sort, can be used to select between the two
DSO sorting algorithms. The default setting of '1' uses the current existing
algorithm, while a value of '2' selects the new DFS-based algorithm.
* A new tunable, glibc.rtld.dynamic_sort, can be used to select between
the two DSO sorting algorithms. The default setting of '2' uses the
new DFS-based algorithm. The setting '1' switches to the old
algorithm used in glibc 2.33 and earlier.
* ABI support for a new function '__memcmpeq'. '__memcmpeq' is meant
to be used by compilers for optimizing usage of 'memcmp' when its

2
elf/dl-tunables.list
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@ -162,7 +162,7 @@ glibc {
type: INT_32
minval: 1
maxval: 2
default: 1
default: 2
}
}
}

2
elf/tst-rtld-list-tunables.exp
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@ -10,6 +10,6 @@ glibc.malloc.tcache_max: 0x0 (min: 0x0, max: 0x[f]+)
glibc.malloc.tcache_unsorted_limit: 0x0 (min: 0x0, max: 0x[f]+)
glibc.malloc.top_pad: 0x0 (min: 0x0, max: 0x[f]+)
glibc.malloc.trim_threshold: 0x0 (min: 0x0, max: 0x[f]+)
glibc.rtld.dynamic_sort: 1 (min: 1, max: 2)
glibc.rtld.dynamic_sort: 2 (min: 1, max: 2)
glibc.rtld.nns: 0x4 (min: 0x1, max: 0x10)
glibc.rtld.optional_static_tls: 0x200 (min: 0x0, max: 0x[f]+)

2
manual/tunables.texi
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@ -318,7 +318,7 @@ value of @samp{2}, a different algorithm is used, which implements a
topological sort through depth-first search, and does not exhibit the
performance issues of @samp{1}.
The default value of this tunable is @samp{1}.
The default value of this tunable is @samp{2}.
@end deftp
@node Elision Tunables