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Specify that Jemalloc configure requires version.

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antirez 2018-05-24 17:49:36 +02:00
parent 08e1c8e820
commit 8d76c6a878
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deps/README.md vendored
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@ -22,16 +22,21 @@ just following tose steps:
1. Remove the jemalloc directory. 1. Remove the jemalloc directory.
2. Substitute it with the new jemalloc source tree. 2. Substitute it with the new jemalloc source tree.
3. Edit the Makefile localted in the same directoy as the README you are
reading, and change the --with-version in the Jemalloc configure script
options with the version you are using. This is required because otherwise
Jemalloc configuration script is broken and will not work nested in another
git repository.
However note that we change Jemalloc settings via the `configure` script of Jemalloc using the `--with-lg-quantum` option, setting it to the value of 3 instead of 4. This provides us with more size classes that better suit the Redis data structures, in order to gain memory efficiency. However note that we change Jemalloc settings via the `configure` script of Jemalloc using the `--with-lg-quantum` option, setting it to the value of 3 instead of 4. This provides us with more size classes that better suit the Redis data structures, in order to gain memory efficiency.
Instead if you want to upgrade Jemalloc while also providing support for If you want to upgrade Jemalloc while also providing support for
defragmentation, you have to replace it with a newer version, and make active defragmentation, in addition to the above steps you need to perform
the following changes: the following additional steps:
1. In Jemalloc three, file `include/jemalloc/jemalloc_macros.h.in`, make sure 5. In Jemalloc three, file `include/jemalloc/jemalloc_macros.h.in`, make sure
to add `#define JEMALLOC_FRAG_HINT`. to add `#define JEMALLOC_FRAG_HINT`.
2. Implement the function `je_get_defrag_hint()` inside `src/jemalloc.c`. You 6. Implement the function `je_get_defrag_hint()` inside `src/jemalloc.c`. You
can see how it is implemented in the current Jemalloc source tree shipped can see how it is implemented in the current Jemalloc source tree shipped
with Redis, and rewrite it according to the new Jemalloc internals, if they with Redis, and rewrite it according to the new Jemalloc internals, if they
changed, otherwise you could just copy the old implementation if you are changed, otherwise you could just copy the old implementation if you are