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discard trailing free page maps

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This commit is contained in:
Nikita Smith
2026-04-15 15:32:51 -07:00
parent 5f3e7e7175
commit d1d42102dd
1 changed files with 26 additions and 30 deletions
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src/linker/pdb_ext/msf_builder.c
+26 -30
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@@ -626,32 +626,31 @@ msf_find_max_pn_(MSF_PageDataList page_data_list, MSF_UInt page_size, MSF_PageNu
for (MSF_Int fpm_pn_idx = (MSF_Int)fpm_pn_arr.count - 1; fpm_pn_idx >= 0; fpm_pn_idx -= 1) {
MSF_PageNumber fpm_pn = fpm_pn_arr.v[fpm_pn_idx];
U32Array fpm_data = msf_fpm_data_from_pn(page_data_list, page_size, fpm_pn);
// we have to work around the fact that FPM bits are always alloced
// and also there is a trail of unused FPM groups too
U32 bit_idx = max_U32;
for (MSF_Int i = fpm_page_count - 1; i >= 0; i -= 1) {
U32 fpm_lo = i * fpm_interval_wrong + 3; // skip first page bit and FPM group bits
U32 fpm_hi = i * fpm_interval_wrong + fpm_interval_wrong;
bit_idx = bit_array_scan_right_to_left32(fpm_data, fpm_lo, fpm_hi, MSF_PAGE_STATE_ALLOC);
if (bit_idx <= fpm_interval_correct) {
break;
}
}
// check first page bit
if (bit_idx >= fpm_interval_correct) {
bit_idx = bit_array_scan_left_to_right32(fpm_data, 0, 1, MSF_PAGE_STATE_ALLOC);
if (bit_idx >= fpm_interval_correct) {
U64 bit_idx = max_U64;
U64 hi = fpm_data.count*32;
while (hi > 0) {
U64 msb_idx = bit_array_scan_right_to_left32(fpm_data, 0, hi, MSF_PAGE_STATE_ALLOC);
// FPM is empty
if (msb_idx >= hi) { break; }
// hit FPM page -- keep going
U64 k = msb_idx % fpm_interval_wrong;
if (k < 3) {
hi = msb_idx;
continue;
}
bit_idx = msb_idx;
break;
}
// stop if there is a page
if (bit_idx != max_U64) {
max_pn = Max(bit_idx, 2) + fpm_pn_idx * fpm_interval_correct;
break;
}
// compute max page number
MSF_PageNumber pn = bit_idx + (MSF_UInt)fpm_pn_idx * fpm_interval_correct;
max_pn = Max(max_pn, pn);
break;
}
return max_pn;
@@ -666,6 +665,7 @@ msf_find_max_pn(MSF_PageDataList page_data_list, MSF_UInt page_size)
MSF_PageNumber fpm0_max = msf_find_max_pn_(page_data_list, page_size, fpm0_pn_arr);
MSF_PageNumber fpm1_max = msf_find_max_pn_(page_data_list, page_size, fpm1_pn_arr);
MSF_PageNumber max_pn = Max(fpm0_max, fpm1_max);
Assert(max_pn > 1);
scratch_end(scratch);
return max_pn;
}
@@ -1672,13 +1672,9 @@ msf_get_page_data_nodes(Arena *arena, MSF_Context *msf)
internal U64
msf_get_save_size(MSF_Context *msf)
{
#if 0
MSF_PageNumber max_pn = msf_find_max_pn(msf->page_data_list, msf->page_size);
U64 size = ((U64)max_pn + 1) * (U64)msf->page_size;
Assert(msf_count_pages(size, msf->page_size) == msf->page_count);
#else
U64 size = (U64)msf->page_count * msf->page_size;
#endif
MSF_PageNumber max_pn = msf_find_max_pn(msf->page_data_list, msf->page_size);
U64 page_count = max_pn + 1;
U64 size = page_count * msf->page_size;
return size;
}