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Diffstat (limited to 'arch/arm/mvp/mvpkm/mvp_balloon.h')
| -rw-r--r-- | arch/arm/mvp/mvpkm/mvp_balloon.h | 217 |
1 files changed, 0 insertions, 217 deletions
diff --git a/arch/arm/mvp/mvpkm/mvp_balloon.h b/arch/arm/mvp/mvpkm/mvp_balloon.h deleted file mode 100644 index 9df5669..0000000 --- a/arch/arm/mvp/mvpkm/mvp_balloon.h +++ /dev/null @@ -1,217 +0,0 @@ -/* - * Linux 2.6.32 and later Kernel module for VMware MVP Hypervisor Support - * - * Copyright (C) 2010-2012 VMware, Inc. All rights reserved. - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License version 2 as published by - * the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for - * more details. - * - * You should have received a copy of the GNU General Public License along with - * this program; see the file COPYING. If not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. - */ -#line 5 - -/** - * @file - * - * @brief Common guest/host balloon state machine. - */ -#ifndef _MVP_BALLOON_H -#define _MVP_BALLOON_H - -#define INCLUDE_ALLOW_VMX -#define INCLUDE_ALLOW_PV -#define INCLUDE_ALLOW_GPL -#define INCLUDE_ALLOW_GUESTUSER -#define INCLUDE_ALLOW_MODULE -#include "include_check.h" - -/** - * @brief Balloon watchdog timeout (in seconds). - * - * If we don't hear back from the guest balloon driver in this amount of time, - * we terminate the guest. - * - * This can sound arbitrary long but we need to deal with checkpointing. The - * watchdog goal is only to not let not-responding VM running for ages. - */ -#define BALLOON_WATCHDOG_TIMEOUT_SECS 90 - -/** - * @brief MVP_BALLOON_GET_DELTA return. - */ -typedef union { - struct { - int32 delta : 21; ///< Number/direction balloon adjustment in pages. - }; - uint32 u; -} Balloon_GetDeltaRet; - -/** - * @name Guest settings for lowmemorykiller oom_adj and minfree thresholds, as reflected in - * the guest's /sys/module/lowmemorykiller/parameters/{minfree,adj}. - * - * @{ - */ - -/** - * @brief Android oom_adj levels for the various thresholds. - */ -typedef enum { - BALLOON_ANDROID_GUEST_OOM_ADJ_FOREGROUND_APP = 0, - BALLOON_ANDROID_GUEST_OOM_ADJ_VISIBLE_APP = 1, - BALLOON_ANDROID_GUEST_OOM_ADJ_SECONDARY_SERVER = 2, - BALLOON_ANDROID_GUEST_OOM_ADJ_BACKUP_APP = 2, - BALLOON_ANDROID_GUEST_OOM_ADJ_HOME_APP = 4, - BALLOON_ANDROID_GUEST_OOM_ADJ_HIDDEN_APP_MIN = 7, - BALLOON_ANDROID_GUEST_OOM_ADJ_CONTENT_PROVIDER = 14, - BALLOON_ANDROID_GUEST_OOM_ADJ_EMPTY_APP = 15 -} Balloon_AndroidGuestOOMAdj; - -/** - * @brief Android low memory killer thresholds (in pages). - */ -typedef enum { - BALLOON_ANDROID_GUEST_MIN_FREE_FOREGROUND_APP_PAGES = 1536, - BALLOON_ANDROID_GUEST_MIN_FREE_VISIBLE_APP_PAGES = 2048, - BALLOON_ANDROID_GUEST_MIN_FREE_SECONDARY_SERVER_PAGES = 4096, - BALLOON_ANDROID_GUEST_MIN_FREE_BACKUP_APP_PAGES = 4096, - BALLOON_ANDROID_GUEST_MIN_FREE_HOME_APP_PAGES = 4096, - BALLOON_ANDROID_GUEST_MIN_FREE_HIDDEN_APP_PAGES = 5120, - BALLOON_ANDROID_GUEST_MIN_FREE_CONTENT_PROVIDER_PAGES = 5632, - BALLOON_ANDROID_GUEST_MIN_FREE_EMPTY_APP_MEM_PAGES = 6144 -} Balloon_AndroidGuestMinFreePages; - -/* @} */ -/** - * @brief Calculate distance to the point at which Android will terminate - * processes. - * - * In the balloon policy we strive to maintain the low memory killer minfree - * value (e.g. max(freePages, filePages)) above the threshold for terminating - * empty apps (as per the Android low memory killer's logic). Here we measure - * the number of pages we have buffering us from this point. - * - * We chose the empty app threshold instead instead of the home app threshold, - * the threshold we ultimately want to avoid crossing for two reasons: - * - We want to avoid any error introduced by the use of max(free, file) when - * between the two thresholds from interfering with the errorBackground term - * in the balloon policy. If we instead measure the distance to the home app - * threshold, we can get into the situation that even when both sides have - * balanced background pages and the same low memory distance, different - * free/file ratios in the two worlds introduces a further bias. - * - It's helpful in avoiding extreme situations where the balloon won't be able - * to adapt quickly to leave a buffer. With empty app minfree as the target, - * when background pages drops to zero, and both worlds are below the empty - * app minfree target, the balloon will stop adjusting, leaving each world to - * fend for itself. At this point, the worlds have a maximum of 8192 pages - * (using the above logic) until they start killing services and foreground - * apps, which seems like a reasonable buffer to have in place. Another way of - * putting it is that at this point, we are unsure that rebalancing the - * balloon won't harm the side it balances against by eating into its buffer. - * - * We assume that normally filePages only decreases as a result of freePages - * being close to zero, when vmscan reclaiming kicks in. Based on this, - * there are two cases when computing the distance. - * - * - filePages >= emptyAppPages: - * freePages + filePages - emptyAppPages - * - filePages < emptyAppPages: - * MAX(0, freePages - emptyAppPages) - * - * @param freePages number of free pages. - * @param filePages number of pages in the page cache. - * @param emptyAppPages number of free/file pages at which the - * lowmemorykiller will start killing empty apps. - * - * @return Low memory distance measure (in pages). - */ -static inline uint32 -Balloon_LowMemDistance(uint32 freePages, uint32 filePages, uint32 emptyAppPages) -{ - return filePages >= emptyAppPages ? - freePages + (filePages - emptyAppPages) : - (freePages > emptyAppPages ? freePages - emptyAppPages : 0); -} - -#ifdef __KERNEL__ -/** - * @brief Obtain approximation of # anonymous pages belonging to Android - * background processes. - * - * Used to inform balloon policy. Note that this is a coarse approximation only, - * since we use RSS. More precise accounting is possible but potentially costly - * as it's not available directly in the task struct. - * - * @param hiddenAppOOMAdj minimum oom_adj for hidden apps. - * - * @return sum of empty, content provider and hidden app anon resident pages. - */ -static uint32 -Balloon_AndroidBackgroundPages(uint32 minHiddenAppOOMAdj) -{ - uint32 backgroundPages = 0, nonBackgroundPages = 0; - struct task_struct *t; - - /* - * Traverse the tasklist to replicate the behavior of the Android low memory - * killer. - */ - rcu_read_lock(); - - for_each_process(t) { - int oom_adj = 0; - - task_lock(t); - - if (t->signal == NULL) { - task_unlock(t); - continue; - } else { - oom_adj = t->signal->oom_adj; - } - - if (t->mm != NULL) { -#ifdef BALLOON_DEBUG_PRINT_ANDROID_PAGES - printk("Balloon_AndroidBackgroundPages: %d %d %s\n", - oom_adj, - (int)get_mm_counter(t->mm, MM_ANONPAGES), - t->comm); -#endif - - if (oom_adj >= (int)minHiddenAppOOMAdj) { - /* - * Unlike the Android low memory killer, we only consider anonymous - * memory here, since we already account for file pages in the - * balloon policy using global_page_state(NR_FILE_PAGES). - */ - backgroundPages += get_mm_counter(t->mm, MM_ANONPAGES); - } else { - nonBackgroundPages += get_mm_counter(t->mm, MM_ANONPAGES); - } - } - - task_unlock(t); - } - - rcu_read_unlock(); - -#ifdef BALLOON_DEBUG_PRINT_ANDROID_PAGES - printk("Balloon_AndroidBackgroundPages: non-background pages: %d " - "background pages: %d\n", - nonBackgroundPages, - backgroundPages); -#endif - - return backgroundPages; -} -#endif - -#endif |