page-types: make standalone pagemap/kpageflags read routines
Refactor the code to be more modular and easier to reuse. Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Cc: Andi Kleen <andi@firstfloor.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -161,8 +161,6 @@ static unsigned long pg_start[MAX_VMAS];
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static unsigned long pg_end[MAX_VMAS];
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static unsigned long voffset;
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static int pagemap_fd;
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#define MAX_BIT_FILTERS 64
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static int nr_bit_filters;
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static uint64_t opt_mask[MAX_BIT_FILTERS];
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@ -170,7 +168,7 @@ static uint64_t opt_bits[MAX_BIT_FILTERS];
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static int page_size;
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#define PAGES_BATCH (64 << 10) /* 64k pages */
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static int pagemap_fd;
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static int kpageflags_fd;
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#define HASH_SHIFT 13
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@ -226,6 +224,62 @@ int checked_open(const char *pathname, int flags)
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return fd;
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}
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/*
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* pagemap/kpageflags routines
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*/
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static unsigned long do_u64_read(int fd, char *name,
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uint64_t *buf,
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unsigned long index,
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unsigned long count)
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{
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long bytes;
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if (index > ULONG_MAX / 8)
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fatal("index overflow: %lu\n", index);
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if (lseek(fd, index * 8, SEEK_SET) < 0) {
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perror(name);
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exit(EXIT_FAILURE);
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}
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bytes = read(fd, buf, count * 8);
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if (bytes < 0) {
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perror(name);
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exit(EXIT_FAILURE);
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}
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if (bytes % 8)
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fatal("partial read: %lu bytes\n", bytes);
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return bytes / 8;
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}
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static unsigned long kpageflags_read(uint64_t *buf,
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unsigned long index,
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unsigned long pages)
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{
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return do_u64_read(kpageflags_fd, PROC_KPAGEFLAGS, buf, index, pages);
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}
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static unsigned long pagemap_read(uint64_t *buf,
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unsigned long index,
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unsigned long pages)
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{
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return do_u64_read(pagemap_fd, "/proc/pid/pagemap", buf, index, pages);
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}
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static unsigned long pagemap_pfn(uint64_t val)
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{
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unsigned long pfn;
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if (val & PM_PRESENT)
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pfn = PM_PFRAME(val);
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else
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pfn = 0;
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return pfn;
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}
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/*
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* page flag names
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@ -432,79 +486,53 @@ static void add_page(unsigned long offset, uint64_t flags)
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total_pages++;
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}
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#define KPAGEFLAGS_BATCH (64 << 10) /* 64k pages */
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static void walk_pfn(unsigned long index, unsigned long count)
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{
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uint64_t buf[KPAGEFLAGS_BATCH];
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unsigned long batch;
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unsigned long n;
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unsigned long pages;
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unsigned long i;
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if (index > ULONG_MAX / KPF_BYTES)
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fatal("index overflow: %lu\n", index);
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lseek(kpageflags_fd, index * KPF_BYTES, SEEK_SET);
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while (count) {
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uint64_t kpageflags_buf[KPF_BYTES * PAGES_BATCH];
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batch = min_t(unsigned long, count, PAGES_BATCH);
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n = read(kpageflags_fd, kpageflags_buf, batch * KPF_BYTES);
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if (n == 0)
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batch = min_t(unsigned long, count, KPAGEFLAGS_BATCH);
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pages = kpageflags_read(buf, index, batch);
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if (pages == 0)
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break;
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if (n < 0) {
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perror(PROC_KPAGEFLAGS);
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exit(EXIT_FAILURE);
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}
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if (n % KPF_BYTES != 0)
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fatal("partial read: %lu bytes\n", n);
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n = n / KPF_BYTES;
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for (i = 0; i < pages; i++)
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add_page(index + i, buf[i]);
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for (i = 0; i < n; i++)
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add_page(index + i, kpageflags_buf[i]);
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index += batch;
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count -= batch;
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index += pages;
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count -= pages;
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}
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}
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#define PAGEMAP_BATCH 4096
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static unsigned long task_pfn(unsigned long pgoff)
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#define PAGEMAP_BATCH (64 << 10)
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static void walk_vma(unsigned long index, unsigned long count)
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{
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static uint64_t buf[PAGEMAP_BATCH];
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static unsigned long start;
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static long count;
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uint64_t pfn;
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uint64_t buf[PAGEMAP_BATCH];
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unsigned long batch;
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unsigned long pages;
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unsigned long pfn;
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unsigned long i;
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if (pgoff < start || pgoff >= start + count) {
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if (lseek64(pagemap_fd,
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(uint64_t)pgoff * PM_ENTRY_BYTES,
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SEEK_SET) < 0) {
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perror("pagemap seek");
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exit(EXIT_FAILURE);
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while (count) {
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batch = min_t(unsigned long, count, PAGEMAP_BATCH);
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pages = pagemap_read(buf, index, batch);
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if (pages == 0)
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break;
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for (i = 0; i < pages; i++) {
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pfn = pagemap_pfn(buf[i]);
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voffset = index + i;
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if (pfn)
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walk_pfn(pfn, 1);
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}
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count = read(pagemap_fd, buf, sizeof(buf));
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if (count == 0)
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return 0;
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if (count < 0) {
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perror("pagemap read");
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exit(EXIT_FAILURE);
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}
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if (count % PM_ENTRY_BYTES) {
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fatal("pagemap read not aligned.\n");
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exit(EXIT_FAILURE);
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}
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count /= PM_ENTRY_BYTES;
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start = pgoff;
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index += pages;
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count -= pages;
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}
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pfn = buf[pgoff - start];
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if (pfn & PM_PRESENT)
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pfn = PM_PFRAME(pfn);
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else
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pfn = 0;
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return pfn;
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}
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static void walk_task(unsigned long index, unsigned long count)
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@ -524,11 +552,7 @@ static void walk_task(unsigned long index, unsigned long count)
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index = min_t(unsigned long, pg_end[i], end);
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assert(voffset < index);
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for (; voffset < index; voffset++) {
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unsigned long pfn = task_pfn(voffset);
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if (pfn)
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walk_pfn(pfn, 1);
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}
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walk_vma(voffset, index - voffset);
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}
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}
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