proc: switch /proc/meminfo to seq_file

and move it to fs/proc/meminfo.c while I'm at it.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>

1 files changed, 168 insertions, 0 deletions

diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
new file mode 100644
index 000000000000..b1675c4e66da
--- /dev/null
+++ b/fs/proc/meminfo.c
@@ -0,0 +1,168 @@
+#include <linux/fs.h>
+#include <linux/hugetlb.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/mman.h>
+#include <linux/mmzone.h>
+#include <linux/proc_fs.h>
+#include <linux/quicklist.h>
+#include <linux/seq_file.h>
+#include <linux/swap.h>
+#include <linux/vmstat.h>
+#include <asm/atomic.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include "internal.h"
+
+void __attribute__((weak)) arch_report_meminfo(struct seq_file *m)
+{
+}
+
+static int meminfo_proc_show(struct seq_file *m, void *v)
+{
+        struct sysinfo i;
+        unsigned long committed;
+        unsigned long allowed;
+        struct vmalloc_info vmi;
+        long cached;
+        unsigned long pages[NR_LRU_LISTS];
+        int lru;
+
+/*
+ * display in kilobytes.
+ */
+#define K(x) ((x) << (PAGE_SHIFT - 10))
+        si_meminfo(&i);
+        si_swapinfo(&i);
+        committed = atomic_long_read(&vm_committed_space);
+        allowed = ((totalram_pages - hugetlb_total_pages())
+                * sysctl_overcommit_ratio / 100) + total_swap_pages;
+
+        cached = global_page_state(NR_FILE_PAGES) -
+                        total_swapcache_pages - i.bufferram;
+        if (cached < 0)
+                cached = 0;
+
+        get_vmalloc_info(&vmi);
+
+        for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++)
+                pages[lru] = global_page_state(NR_LRU_BASE + lru);
+
+        /*
+         * Tagged format, for easy grepping and expansion.
+         */
+        seq_printf(m,
+                "MemTotal:       %8lu kB\n"
+                "MemFree:        %8lu kB\n"
+                "Buffers:        %8lu kB\n"
+                "Cached:         %8lu kB\n"
+                "SwapCached:     %8lu kB\n"
+                "Active:         %8lu kB\n"
+                "Inactive:       %8lu kB\n"
+                "Active(anon):   %8lu kB\n"
+                "Inactive(anon): %8lu kB\n"
+                "Active(file):   %8lu kB\n"
+                "Inactive(file): %8lu kB\n"
+#ifdef CONFIG_UNEVICTABLE_LRU
+                "Unevictable:    %8lu kB\n"
+                "Mlocked:        %8lu kB\n"
+#endif
+#ifdef CONFIG_HIGHMEM
+                "HighTotal:      %8lu kB\n"
+                "HighFree:       %8lu kB\n"
+                "LowTotal:       %8lu kB\n"
+                "LowFree:        %8lu kB\n"
+#endif
+                "SwapTotal:      %8lu kB\n"
+                "SwapFree:       %8lu kB\n"
+                "Dirty:          %8lu kB\n"
+                "Writeback:      %8lu kB\n"
+                "AnonPages:      %8lu kB\n"
+                "Mapped:         %8lu kB\n"
+                "Slab:           %8lu kB\n"
+                "SReclaimable:   %8lu kB\n"
+                "SUnreclaim:     %8lu kB\n"
+                "PageTables:     %8lu kB\n"
+#ifdef CONFIG_QUICKLIST
+                "Quicklists:     %8lu kB\n"
+#endif
+                "NFS_Unstable:   %8lu kB\n"
+                "Bounce:         %8lu kB\n"
+                "WritebackTmp:   %8lu kB\n"
+                "CommitLimit:    %8lu kB\n"
+                "Committed_AS:   %8lu kB\n"
+                "VmallocTotal:   %8lu kB\n"
+                "VmallocUsed:    %8lu kB\n"
+                "VmallocChunk:   %8lu kB\n",
+                K(i.totalram),
+                K(i.freeram),
+                K(i.bufferram),
+                K(cached),
+                K(total_swapcache_pages),
+                K(pages[LRU_ACTIVE_ANON]   + pages[LRU_ACTIVE_FILE]),
+                K(pages[LRU_INACTIVE_ANON] + pages[LRU_INACTIVE_FILE]),
+                K(pages[LRU_ACTIVE_ANON]),
+                K(pages[LRU_INACTIVE_ANON]),
+                K(pages[LRU_ACTIVE_FILE]),
+                K(pages[LRU_INACTIVE_FILE]),
+#ifdef CONFIG_UNEVICTABLE_LRU
+                K(pages[LRU_UNEVICTABLE]),
+                K(global_page_state(NR_MLOCK)),
+#endif
+#ifdef CONFIG_HIGHMEM
+                K(i.totalhigh),
+                K(i.freehigh),
+                K(i.totalram-i.totalhigh),
+                K(i.freeram-i.freehigh),
+#endif
+                K(i.totalswap),
+                K(i.freeswap),
+                K(global_page_state(NR_FILE_DIRTY)),
+                K(global_page_state(NR_WRITEBACK)),
+                K(global_page_state(NR_ANON_PAGES)),
+                K(global_page_state(NR_FILE_MAPPED)),
+                K(global_page_state(NR_SLAB_RECLAIMABLE) +
+                                global_page_state(NR_SLAB_UNRECLAIMABLE)),
+                K(global_page_state(NR_SLAB_RECLAIMABLE)),
+                K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
+                K(global_page_state(NR_PAGETABLE)),
+#ifdef CONFIG_QUICKLIST
+                K(quicklist_total_size()),
+#endif
+                K(global_page_state(NR_UNSTABLE_NFS)),
+                K(global_page_state(NR_BOUNCE)),
+                K(global_page_state(NR_WRITEBACK_TEMP)),
+                K(allowed),
+                K(committed),
+                (unsigned long)VMALLOC_TOTAL >> 10,
+                vmi.used >> 10,
+                vmi.largest_chunk >> 10
+                );
+
+        hugetlb_report_meminfo(m);
+
+        arch_report_meminfo(m);
+
+        return 0;
+#undef K
+}
+
+static int meminfo_proc_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, meminfo_proc_show, NULL);
+}
+
+static const struct file_operations meminfo_proc_fops = {
+        .open           = meminfo_proc_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static int __init proc_meminfo_init(void)
+{
+        proc_create("meminfo", 0, NULL, &meminfo_proc_fops);
+        return 0;
+}
+module_init(proc_meminfo_init);