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Use a for-loop to fulfill flush requests that are larger than CACHE_BIN_NFLUSH_BATCH_MAX items

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Shirui Cheng 2024-07-18 17:33:07 -07:00 • committed by Qi Wang
parent 48f66cf4a2
commit 47c9bcd402
2 changed files with 39 additions and 16 deletions
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8
include/jemalloc/internal/cache_bin.h
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@ -600,6 +600,14 @@ cache_bin_nitems_get_remote(cache_bin_t *bin, cache_bin_sz_t *ncached,
*/
}
/*
* Limit how many items can be flushed in a batch (Which is the upper bound
* for the nflush parameter in tcache_bin_flush_impl()).
* This is to avoid stack overflow when we do batch edata look up, which
* reserves a nflush * sizeof(emap_batch_lookup_result_t) stack variable.
*/
#define CACHE_BIN_NFLUSH_BATCH_MAX (VARIABLE_ARRAY_SIZE_MAX >> LG_SIZEOF_PTR)
/*
* Filling and flushing are done in batch, on arrays of void *s. For filling,
* the arrays go forward, and can be accessed with ordinary array arithmetic.