v4.19.13 snapshot.
diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
new file mode 100644
index 0000000..edda898
--- /dev/null
+++ b/fs/proc/meminfo.c
@@ -0,0 +1,159 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/hugetlb.h>
+#include <linux/mman.h>
+#include <linux/mmzone.h>
+#include <linux/proc_fs.h>
+#include <linux/percpu.h>
+#include <linux/quicklist.h>
+#include <linux/seq_file.h>
+#include <linux/swap.h>
+#include <linux/vmstat.h>
+#include <linux/atomic.h>
+#include <linux/vmalloc.h>
+#ifdef CONFIG_CMA
+#include <linux/cma.h>
+#endif
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include "internal.h"
+
+void __attribute__((weak)) arch_report_meminfo(struct seq_file *m)
+{
+}
+
+static void show_val_kb(struct seq_file *m, const char *s, unsigned long num)
+{
+ seq_put_decimal_ull_width(m, s, num << (PAGE_SHIFT - 10), 8);
+ seq_write(m, " kB\n", 4);
+}
+
+static int meminfo_proc_show(struct seq_file *m, void *v)
+{
+ struct sysinfo i;
+ unsigned long committed;
+ long cached;
+ long available;
+ unsigned long pages[NR_LRU_LISTS];
+ int lru;
+
+ si_meminfo(&i);
+ si_swapinfo(&i);
+ committed = percpu_counter_read_positive(&vm_committed_as);
+
+ cached = global_node_page_state(NR_FILE_PAGES) -
+ total_swapcache_pages() - i.bufferram;
+ if (cached < 0)
+ cached = 0;
+
+ for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++)
+ pages[lru] = global_node_page_state(NR_LRU_BASE + lru);
+
+ available = si_mem_available();
+
+ show_val_kb(m, "MemTotal: ", i.totalram);
+ show_val_kb(m, "MemFree: ", i.freeram);
+ show_val_kb(m, "MemAvailable: ", available);
+ show_val_kb(m, "Buffers: ", i.bufferram);
+ show_val_kb(m, "Cached: ", cached);
+ show_val_kb(m, "SwapCached: ", total_swapcache_pages());
+ show_val_kb(m, "Active: ", pages[LRU_ACTIVE_ANON] +
+ pages[LRU_ACTIVE_FILE]);
+ show_val_kb(m, "Inactive: ", pages[LRU_INACTIVE_ANON] +
+ pages[LRU_INACTIVE_FILE]);
+ show_val_kb(m, "Active(anon): ", pages[LRU_ACTIVE_ANON]);
+ show_val_kb(m, "Inactive(anon): ", pages[LRU_INACTIVE_ANON]);
+ show_val_kb(m, "Active(file): ", pages[LRU_ACTIVE_FILE]);
+ show_val_kb(m, "Inactive(file): ", pages[LRU_INACTIVE_FILE]);
+ show_val_kb(m, "Unevictable: ", pages[LRU_UNEVICTABLE]);
+ show_val_kb(m, "Mlocked: ", global_zone_page_state(NR_MLOCK));
+
+#ifdef CONFIG_HIGHMEM
+ show_val_kb(m, "HighTotal: ", i.totalhigh);
+ show_val_kb(m, "HighFree: ", i.freehigh);
+ show_val_kb(m, "LowTotal: ", i.totalram - i.totalhigh);
+ show_val_kb(m, "LowFree: ", i.freeram - i.freehigh);
+#endif
+
+#ifndef CONFIG_MMU
+ show_val_kb(m, "MmapCopy: ",
+ (unsigned long)atomic_long_read(&mmap_pages_allocated));
+#endif
+
+ show_val_kb(m, "SwapTotal: ", i.totalswap);
+ show_val_kb(m, "SwapFree: ", i.freeswap);
+ show_val_kb(m, "Dirty: ",
+ global_node_page_state(NR_FILE_DIRTY));
+ show_val_kb(m, "Writeback: ",
+ global_node_page_state(NR_WRITEBACK));
+ show_val_kb(m, "AnonPages: ",
+ global_node_page_state(NR_ANON_MAPPED));
+ show_val_kb(m, "Mapped: ",
+ global_node_page_state(NR_FILE_MAPPED));
+ show_val_kb(m, "Shmem: ", i.sharedram);
+ show_val_kb(m, "Slab: ",
+ global_node_page_state(NR_SLAB_RECLAIMABLE) +
+ global_node_page_state(NR_SLAB_UNRECLAIMABLE));
+
+ show_val_kb(m, "SReclaimable: ",
+ global_node_page_state(NR_SLAB_RECLAIMABLE));
+ show_val_kb(m, "SUnreclaim: ",
+ global_node_page_state(NR_SLAB_UNRECLAIMABLE));
+ seq_printf(m, "KernelStack: %8lu kB\n",
+ global_zone_page_state(NR_KERNEL_STACK_KB));
+ show_val_kb(m, "PageTables: ",
+ global_zone_page_state(NR_PAGETABLE));
+#ifdef CONFIG_QUICKLIST
+ show_val_kb(m, "Quicklists: ", quicklist_total_size());
+#endif
+
+ show_val_kb(m, "NFS_Unstable: ",
+ global_node_page_state(NR_UNSTABLE_NFS));
+ show_val_kb(m, "Bounce: ",
+ global_zone_page_state(NR_BOUNCE));
+ show_val_kb(m, "WritebackTmp: ",
+ global_node_page_state(NR_WRITEBACK_TEMP));
+ show_val_kb(m, "CommitLimit: ", vm_commit_limit());
+ show_val_kb(m, "Committed_AS: ", committed);
+ seq_printf(m, "VmallocTotal: %8lu kB\n",
+ (unsigned long)VMALLOC_TOTAL >> 10);
+ show_val_kb(m, "VmallocUsed: ", 0ul);
+ show_val_kb(m, "VmallocChunk: ", 0ul);
+ show_val_kb(m, "Percpu: ", pcpu_nr_pages());
+
+#ifdef CONFIG_MEMORY_FAILURE
+ seq_printf(m, "HardwareCorrupted: %5lu kB\n",
+ atomic_long_read(&num_poisoned_pages) << (PAGE_SHIFT - 10));
+#endif
+
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+ show_val_kb(m, "AnonHugePages: ",
+ global_node_page_state(NR_ANON_THPS) * HPAGE_PMD_NR);
+ show_val_kb(m, "ShmemHugePages: ",
+ global_node_page_state(NR_SHMEM_THPS) * HPAGE_PMD_NR);
+ show_val_kb(m, "ShmemPmdMapped: ",
+ global_node_page_state(NR_SHMEM_PMDMAPPED) * HPAGE_PMD_NR);
+#endif
+
+#ifdef CONFIG_CMA
+ show_val_kb(m, "CmaTotal: ", totalcma_pages);
+ show_val_kb(m, "CmaFree: ",
+ global_zone_page_state(NR_FREE_CMA_PAGES));
+#endif
+
+ hugetlb_report_meminfo(m);
+
+ arch_report_meminfo(m);
+
+ return 0;
+}
+
+static int __init proc_meminfo_init(void)
+{
+ proc_create_single("meminfo", 0, NULL, meminfo_proc_show);
+ return 0;
+}
+fs_initcall(proc_meminfo_init);