mirrors/mimalloc
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

fix valgrind tracking for zero initialized segments

Browse Source
This commit is contained in:
Daan Leijen 2023-03-06 10:44:43 -08:00
parent 8184e9de1f
commit a90737a7fa
1 changed files with 7 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
src/segment.c
View File

@ -796,8 +796,6 @@ static mi_segment_t* mi_segment_os_alloc( size_t required, size_t page_alignment
const size_t extra = align_offset - info_size;
// recalculate due to potential guard pages
*psegment_slices = mi_segment_calculate_slices(required + extra, ppre_size, pinfo_slices);
//segment_size += _mi_align_up(align_offset - info_size, MI_SEGMENT_SLICE_SIZE);
//segment_slices = segment_size / MI_SEGMENT_SLICE_SIZE;
}
const size_t segment_size = (*psegment_slices) * MI_SEGMENT_SLICE_SIZE;
mi_segment_t* segment = NULL;
@ -831,7 +829,10 @@ static mi_segment_t* mi_segment_os_alloc( size_t required, size_t page_alignment
if (!ok) return NULL; // failed to commit
mi_commit_mask_set(pcommit_mask, &commit_needed_mask);
}
mi_track_mem_undefined(segment,commit_needed*MI_COMMIT_SIZE);
else if (*is_zero) {
// track zero initialization for valgrind
mi_track_mem_defined(segment, commit_needed * MI_COMMIT_SIZE);
}
segment->memid = memid;
segment->mem_is_pinned = is_pinned;
segment->mem_is_large = mem_large;
@ -874,18 +875,14 @@ static mi_segment_t* mi_segment_alloc(size_t required, size_t page_alignment, mi
if (segment == NULL) return NULL;
// zero the segment info? -- not always needed as it may be zero initialized from the OS
mi_track_mem_defined(segment, offsetof(mi_segment_t, next)); // needed for valgrind
mi_atomic_store_ptr_release(mi_segment_t, &segment->abandoned_next, NULL); // tsan
{
ptrdiff_t ofs = offsetof(mi_segment_t, next);
ptrdiff_t ofs = offsetof(mi_segment_t, next);
size_t prefix = offsetof(mi_segment_t, slices) - ofs;
size_t zsize = prefix + sizeof(mi_slice_t) * (segment_slices + 1); // one more
size_t zsize = prefix + (sizeof(mi_slice_t) * (segment_slices + 1)); // one more
if (!is_zero) {
memset((uint8_t*)segment + ofs, 0, zsize);
}
else {
mi_track_mem_defined((uint8_t*)segment + ofs, zsize); // todo: somehow needed for valgrind?
}
}
}
segment->commit_mask = commit_mask; // on lazy commit, the initial part is always committed