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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 | // SPDX-License-Identifier: GPL-2.0 /* * Copyright (c) 2000-2005 Silicon Graphics, Inc. * All Rights Reserved. */ #include <linux/mm.h> #include <linux/sched/mm.h> #include <linux/highmem.h> #include <linux/slab.h> #include <linux/swap.h> #include <linux/blkdev.h> #include <linux/backing-dev.h> #include "kmem.h" #include "xfs_message.h" void * kmem_alloc(size_t size, xfs_km_flags_t flags) { int retries = 0; gfp_t lflags = kmem_flags_convert(flags); void *ptr; do { ptr = kmalloc(size, lflags); if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP))) return ptr; if (!(++retries % 100)) xfs_err(NULL, "%s(%u) possible memory allocation deadlock size %u in %s (mode:0x%x)", current->comm, current->pid, (unsigned int)size, __func__, lflags); congestion_wait(BLK_RW_ASYNC, HZ/50); } while (1); } void * kmem_alloc_large(size_t size, xfs_km_flags_t flags) { unsigned nofs_flag = 0; void *ptr; gfp_t lflags; ptr = kmem_alloc(size, flags | KM_MAYFAIL); if (ptr) return ptr; /* * __vmalloc() will allocate data pages and auxillary structures (e.g. * pagetables) with GFP_KERNEL, yet we may be under GFP_NOFS context * here. Hence we need to tell memory reclaim that we are in such a * context via PF_MEMALLOC_NOFS to prevent memory reclaim re-entering * the filesystem here and potentially deadlocking. */ if (flags & KM_NOFS) nofs_flag = memalloc_nofs_save(); lflags = kmem_flags_convert(flags); ptr = __vmalloc(size, lflags, PAGE_KERNEL); if (flags & KM_NOFS) memalloc_nofs_restore(nofs_flag); return ptr; } void * kmem_realloc(const void *old, size_t newsize, xfs_km_flags_t flags) { int retries = 0; gfp_t lflags = kmem_flags_convert(flags); void *ptr; do { ptr = krealloc(old, newsize, lflags); if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP))) return ptr; if (!(++retries % 100)) xfs_err(NULL, "%s(%u) possible memory allocation deadlock size %zu in %s (mode:0x%x)", current->comm, current->pid, newsize, __func__, lflags); congestion_wait(BLK_RW_ASYNC, HZ/50); } while (1); } void * kmem_zone_alloc(kmem_zone_t *zone, xfs_km_flags_t flags) { int retries = 0; gfp_t lflags = kmem_flags_convert(flags); void *ptr; do { ptr = kmem_cache_alloc(zone, lflags); if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP))) return ptr; if (!(++retries % 100)) xfs_err(NULL, "%s(%u) possible memory allocation deadlock in %s (mode:0x%x)", current->comm, current->pid, __func__, lflags); congestion_wait(BLK_RW_ASYNC, HZ/50); } while (1); } |