Import pprof from google-perftools, svn r91.
Fix divide-by-zero error in pprof. It is possible for sample contexts to currently have no associated objects, but the cumulative statistics are still useful, depending on how the user invokes pprof. Since jemalloc intentionally does not filter such contexts, take care not to divide by 0 when re-scaling for v2 heap sampling. Install pprof as part of 'make install'. Update pprof documentation.
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@@ -376,8 +376,8 @@ will disable dirty page purging.
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@roff_prof@option for information on interval-triggered profile dumping, and the
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@roff_prof@.Dq U
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@roff_prof@option for information on high-water-triggered profile dumping.
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@roff_prof@Profile output is compatible with the pprof Perl script, which is
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@roff_prof@part of the google-perftools package
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@roff_prof@Profile output is compatible with the included pprof Perl script,
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@roff_prof@which originates from the google-perftools package
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@roff_prof@(http://code.google.com/p/google-perftools/).
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@roff_tcache@.It G
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@roff_tcache@Double/halve the approximate interval (counted in terms of
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