| compaction.c (ef4984384172e93cc95e0e8cd102536d67e8a787) | compaction.c (06dac2f467fe9269a433aa5056dd2ee1d20475e9) |
|---|---|
| 1// SPDX-License-Identifier: GPL-2.0 2/* 3 * linux/mm/compaction.c 4 * 5 * Memory compaction for the reduction of external fragmentation. Note that 6 * this heavily depends upon page migration to do all the real heavy 7 * lifting 8 * --- 2515 unchanged lines hidden (view full) --- 2524 2525 /* 2526 * Make sure we hide capture control first before we read the captured 2527 * page pointer, otherwise an interrupt could free and capture a page 2528 * and we would leak it. 2529 */ 2530 WRITE_ONCE(current->capture_control, NULL); 2531 *capture = READ_ONCE(capc.page); | 1// SPDX-License-Identifier: GPL-2.0 2/* 3 * linux/mm/compaction.c 4 * 5 * Memory compaction for the reduction of external fragmentation. Note that 6 * this heavily depends upon page migration to do all the real heavy 7 * lifting 8 * --- 2515 unchanged lines hidden (view full) --- 2524 2525 /* 2526 * Make sure we hide capture control first before we read the captured 2527 * page pointer, otherwise an interrupt could free and capture a page 2528 * and we would leak it. 2529 */ 2530 WRITE_ONCE(current->capture_control, NULL); 2531 *capture = READ_ONCE(capc.page); |
| 2532 /* 2533 * Technically, it is also possible that compaction is skipped but 2534 * the page is still captured out of luck(IRQ came and freed the page). 2535 * Returning COMPACT_SUCCESS in such cases helps in properly accounting 2536 * the COMPACT[STALL|FAIL] when compaction is skipped. 2537 */ 2538 if (*capture) 2539 ret = COMPACT_SUCCESS; |
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| 2532 2533 return ret; 2534} 2535 2536int sysctl_extfrag_threshold = 500; 2537 2538/** 2539 * try_to_compact_pages - Direct compact to satisfy a high-order allocation --- 468 unchanged lines hidden --- | 2540 2541 return ret; 2542} 2543 2544int sysctl_extfrag_threshold = 500; 2545 2546/** 2547 * try_to_compact_pages - Direct compact to satisfy a high-order allocation --- 468 unchanged lines hidden --- |