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MDEV-31234 fixup: Free some UNDO pages earlier

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trx_purge_truncate_rseg_history(): Add a parameter to specify if
the entire rollback segment is safe to be freed. If not, we may
still be able to invoke trx_undo_truncate_start() and free some pages.
This commit is contained in:
Marko Mäkelä
2023-05-24 08:25:26 +03:00
parent e0084b9d31
commit c5cf94b2dc
1 changed files with 11 additions and 4 deletions
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15
storage/innobase/trx/trx0purge.cc
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@@ -399,12 +399,14 @@ void trx_purge_free_segment(mtr_t &mtr, trx_rseg_t* rseg, fil_addr_t hdr_addr)
/** Remove unnecessary history data from a rollback segment.
@param[in,out] rseg rollback segment
@param[in] limit truncate anything before this */
@param[in] limit truncate anything before this
@param[in] all whether everything can be truncated */
static
void
trx_purge_truncate_rseg_history(
trx_rseg_t& rseg,
const purge_sys_t::iterator& limit)
const purge_sys_t::iterator& limit,
bool all)
{
fil_addr_t hdr_addr;
fil_addr_t prev_hdr_addr;
@@ -443,6 +445,10 @@ func_exit:
goto func_exit;
}
if (!all) {
goto func_exit;
}
prev_hdr_addr = flst_get_prev_addr(block->frame + hdr_addr.boffset
+ TRX_UNDO_HISTORY_NODE);
prev_hdr_addr.boffset = static_cast<uint16_t>(prev_hdr_addr.boffset
@@ -539,8 +545,9 @@ static void trx_purge_truncate_history()
ut_ad(rseg->id == i);
ut_ad(rseg->is_persistent());
mutex_enter(&rseg->mutex);
if (!rseg->trx_ref_count && rseg->needs_purge <= head.trx_no)
trx_purge_truncate_rseg_history(*rseg, head);
trx_purge_truncate_rseg_history(*rseg, head,
!rseg->trx_ref_count &&
rseg->needs_purge <= head.trx_no);
mutex_exit(&rseg->mutex);
}
}