Changeset 010be476 in mainline
- Timestamp:
- 2011-04-21T19:27:02Z (13 years ago)
- Branches:
- lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export
- Children:
- 7da90cd, d61c3a7
- Parents:
- 864b0dd
- File:
-
- 1 edited
Legend:
- Unmodified
- Added
- Removed
-
kernel/generic/src/mm/reserve.c
r864b0dd r010be476 38 38 #include <mm/reserve.h> 39 39 #include <mm/frame.h> 40 #include <mm/slab.h> 40 41 #include <synch/spinlock.h> 41 42 #include <typedefs.h> … … 45 46 static ssize_t reserve = 0; 46 47 48 /** Try to reserve memory. 49 * 50 * This function may not be called from contexts that do not allow memory 51 * reclaiming, such as some invocations of frame_alloc_generic(). 52 * 53 * @param size Number of frames to reserve. 54 * @return True on success or false otherwise. 55 */ 47 56 bool reserve_try_alloc(size_t size) 48 57 { … … 53 62 reserve -= size; 54 63 reserved = true; 64 } else { 65 /* 66 * Some reservable frames may be cached by the slab allocator. 67 * Try to reclaim some reservable memory. Try to be gentle for 68 * the first time. If it does not help, try to reclaim 69 * everything. 70 */ 71 irq_spinlock_unlock(&reserve_lock, true); 72 slab_reclaim(0); 73 irq_spinlock_lock(&reserve_lock, true); 74 if (reserve >= 0 && (size_t) reserve >= size) { 75 reserve -= size; 76 reserved = true; 77 } else { 78 irq_spinlock_unlock(&reserve_lock, true); 79 slab_reclaim(SLAB_RECLAIM_ALL); 80 irq_spinlock_lock(&reserve_lock, true); 81 if (reserve >= 0 && (size_t) reserve >= size) { 82 reserve -= size; 83 reserved = true; 84 } 85 } 55 86 } 56 87 irq_spinlock_unlock(&reserve_lock, true); … … 59 90 } 60 91 92 /** Reserve memory. 93 * 94 * This function simply marks the respective amount of memory frames reserved. 95 * It does not implement any sort of blocking for the case there is not enough 96 * reservable memory. It will simply take the reserve into negative numbers and 97 * leave the blocking up to the allocation phase. 98 * 99 * @param size Number of frames to reserve. 100 */ 61 101 void reserve_force_alloc(size_t size) 62 102 { … … 66 106 } 67 107 108 /** Unreserve memory. 109 * 110 * @param size Number of frames to unreserve. 111 */ 68 112 void reserve_free(size_t size) 69 113 {
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