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add support to visit _all_ abandoned segment blocks per sub-process, upstream for python/cpython#114133

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daanx 2024-06-02 09:41:12 -07:00
parent 8f874555d5
commit 855e3b2549
3 changed files with 121 additions and 45 deletions
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7
include/mimalloc/types.h
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@ -404,7 +404,7 @@ typedef struct mi_segment_s {
bool was_reclaimed; // true if it was reclaimed (used to limit on-free reclamation)
size_t abandoned; // abandoned pages (i.e. the original owning thread stopped) (`abandoned <= used`)
size_t abandoned_visits; // count how often this segment is visited in the abandoned list (to force reclaim if it is too long)
size_t abandoned_visits; // count how often this segment is visited for reclaiming (to force reclaim if it is too long)
size_t used; // count of pages in use (`used <= capacity`)
size_t capacity; // count of available pages (`#free + used`)
@ -412,6 +412,9 @@ typedef struct mi_segment_s {
uintptr_t cookie; // verify addresses in secure mode: `_mi_ptr_cookie(segment) == segment->cookie`
mi_subproc_t* subproc; // segment belongs to sub process
struct mi_segment_s* abandoned_os_next; // only used for abandoned segments outside arena's, and only if `mi_option_visit_abandoned` is enabled
struct mi_segment_s* abandoned_os_prev;
// layout like this to optimize access in `mi_free`
_Atomic(mi_threadid_t) thread_id; // unique id of the thread owning this segment
size_t page_shift; // `1 << page_shift` == the page sizes == `page->block_size * page->reserved` (unless the first page, then `-segment_info_size`).
@ -609,6 +612,8 @@ void _mi_stat_counter_increase(mi_stat_counter_t* stat, size_t amount);
struct mi_subproc_s {
_Atomic(size_t) abandoned_count; // count of abandoned segments for this sup-process
mi_lock_t abandoned_os_lock; // lock for the abandoned segments outside of arena's
mi_segment_t* abandoned_os_list; // doubly-linked list of abandoned segments outside of arena's (in OS allocated memory)
mi_memid_t memid; // provenance
};