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| author | Damien George <damien.p.george@gmail.com> | 2016-08-26 15:35:26 +1000 |
|---|---|---|
| committer | Damien George <damien.p.george@gmail.com> | 2016-08-26 15:35:26 +1000 |
| commit | 5ffe1d8dc07930818bbac6a88bec2aa5bd973402 (patch) | |
| tree | 8832549d203085db88cb72d8abb6fea1c6d57d59 /py/mpconfig.h | |
| parent | d29ca28288581ca788e468528ea1680b99eb49e5 (diff) | |
py/gc: Add MICROPY_GC_CONSERVATIVE_CLEAR option to always zero memory.
There can be stray pointers in memory blocks that are not properly zero'd
after allocation. This patch adds a new config option to always zero all
allocated memory (via gc_alloc and gc_realloc) and hence help to eliminate
stray pointers.
See issue #2195.
Diffstat (limited to 'py/mpconfig.h')
| -rw-r--r-- | py/mpconfig.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/py/mpconfig.h b/py/mpconfig.h index 491a53746..23591e0da 100644 --- a/py/mpconfig.h +++ b/py/mpconfig.h @@ -107,6 +107,15 @@ #define MICROPY_ALLOC_GC_STACK_SIZE (64) #endif +// Be conservative and always clear to zero newly (re)allocated memory in the GC. +// This helps eliminate stray pointers that hold on to memory that's no longer +// used. It decreases performance due to unnecessary memory clearing. +// TODO Do analysis to understand why some memory is not properly cleared and +// find a more efficient way to clear it. +#ifndef MICROPY_GC_CONSERVATIVE_CLEAR +#define MICROPY_GC_CONSERVATIVE_CLEAR (1) +#endif + // Support automatic GC when reaching allocation threshold, // configurable by gc.threshold(). #ifndef MICROPY_GC_ALLOC_THRESHOLD |