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Sourcecode: fio version File versions

memory.c

/*
 * Memory helpers
 */
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/shm.h>
#include <sys/mman.h>

#include "fio.h"

static void *pinned_mem;

void fio_unpin_memory(void)
{
      if (pinned_mem) {
            dprint(FD_MEM, "unpinning %llu bytes\n", mlock_size);
            if (munlock(pinned_mem, mlock_size) < 0)
                  perror("munlock");
            munmap(pinned_mem, mlock_size);
            pinned_mem = NULL;
      }
}

int fio_pin_memory(void)
{
      unsigned long long phys_mem;

      if (!mlock_size)
            return 0;

      dprint(FD_MEM, "pinning %llu bytes\n", mlock_size);

      /*
       * Don't allow mlock of more than real_mem-128MB
       */
      phys_mem = os_phys_mem();
      if (phys_mem) {
            if ((mlock_size + 128 * 1024 * 1024) > phys_mem) {
                  mlock_size = phys_mem - 128 * 1024 * 1024;
                  log_info("fio: limiting mlocked memory to %lluMB\n",
                                          mlock_size >> 20);
            }
      }

      pinned_mem = mmap(NULL, mlock_size, PROT_READ | PROT_WRITE,
                        MAP_PRIVATE | OS_MAP_ANON, -1, 0);
      if (pinned_mem == MAP_FAILED) {
            perror("malloc locked mem");
            pinned_mem = NULL;
            return 1;
      }
      if (mlock(pinned_mem, mlock_size) < 0) {
            perror("mlock");
            munmap(pinned_mem, mlock_size);
            pinned_mem = NULL;
            return 1;
      }

      return 0;
}

static int alloc_mem_shm(struct thread_data *td, unsigned int total_mem)
{
      int flags = IPC_CREAT | SHM_R | SHM_W;

      if (td->o.mem_type == MEM_SHMHUGE)
            flags |= SHM_HUGETLB;

      td->shm_id = shmget(IPC_PRIVATE, total_mem, flags);
      dprint(FD_MEM, "shmget %u, %d\n", total_mem, td->shm_id);
      if (td->shm_id < 0) {
            td_verror(td, errno, "shmget");
            if (geteuid() != 0 && errno == ENOMEM)
                  log_err("fio: you may need to run this job as root\n");
            if (td->o.mem_type == MEM_SHMHUGE) {
                  if (errno == EINVAL) {
                        log_err("fio: check that you have free huge"
                              " pages and that hugepage-size is"
                              " correct.\n");
                  } else if (errno == ENOSYS) {
                        log_err("fio: your system does not appear to"
                              " support huge pages.\n");
                  } else if (errno == ENOMEM) {
                        log_err("fio: no huge pages available, do you"
                              " need to alocate some? See HOWTO.\n");
                  }
            }

            return 1;
      }

      td->orig_buffer = shmat(td->shm_id, NULL, 0);
      dprint(FD_MEM, "shmat %d, %p\n", td->shm_id, td->orig_buffer);
      if (td->orig_buffer == (void *) -1) {
            td_verror(td, errno, "shmat");
            td->orig_buffer = NULL;
            return 1;
      }

      return 0;
}

static void free_mem_shm(struct thread_data *td)
{
      struct shmid_ds sbuf;

      dprint(FD_MEM, "shmdt/ctl %d %p\n", td->shm_id, td->orig_buffer);
      shmdt(td->orig_buffer);
      shmctl(td->shm_id, IPC_RMID, &sbuf);
}

static int alloc_mem_mmap(struct thread_data *td, unsigned int total_mem)
{
      int flags = MAP_PRIVATE;

      td->mmapfd = 1;

      if (td->mmapfile) {
            td->mmapfd = open(td->mmapfile, O_RDWR|O_CREAT, 0644);

            if (td->mmapfd < 0) {
                  td_verror(td, errno, "open mmap file");
                  td->orig_buffer = NULL;
                  return 1;
            }
            if (ftruncate(td->mmapfd, total_mem) < 0) {
                  td_verror(td, errno, "truncate mmap file");
                  td->orig_buffer = NULL;
                  return 1;
            }
      } else
            flags |= OS_MAP_ANON;

      td->orig_buffer = mmap(NULL, total_mem, PROT_READ | PROT_WRITE, flags,
                        td->mmapfd, 0);
      dprint(FD_MEM, "mmap %u/%d %p\n", total_mem, td->mmapfd,
                                    td->orig_buffer);
      if (td->orig_buffer == MAP_FAILED) {
            td_verror(td, errno, "mmap");
            td->orig_buffer = NULL;
            if (td->mmapfd) {
                  close(td->mmapfd);
                  unlink(td->mmapfile);
            }

            return 1;
      }

      return 0;
}

static void free_mem_mmap(struct thread_data *td, unsigned int total_mem)
{
      dprint(FD_MEM, "munmap %u %p\n", total_mem, td->orig_buffer);
      munmap(td->orig_buffer, td->orig_buffer_size);
      if (td->mmapfile) {
            close(td->mmapfd);
            unlink(td->mmapfile);
            free(td->mmapfile);
      }
}

static int alloc_mem_malloc(struct thread_data *td, unsigned int total_mem)
{
      td->orig_buffer = malloc(total_mem);
      dprint(FD_MEM, "malloc %u %p\n", total_mem, td->orig_buffer);

      return td->orig_buffer == NULL;
}

static void free_mem_malloc(struct thread_data *td)
{
      dprint(FD_MEM, "free malloc mem %p\n", td->orig_buffer);
      free(td->orig_buffer);
}

/*
 * Setup the buffer area we need for io.
 */
int allocate_io_mem(struct thread_data *td)
{
      unsigned int total_mem;
      int ret = 0;

      if (td->io_ops->flags & FIO_NOIO)
            return 0;

      total_mem = td->orig_buffer_size;

      if (td->o.odirect || td->o.mem_align) {
            total_mem += page_mask;
            if (td->o.mem_align && td->o.mem_align > page_size)
                  total_mem += td->o.mem_align - page_size;
      }

      if (td->o.mem_type == MEM_MALLOC)
            ret = alloc_mem_malloc(td, total_mem);
      else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE)
            ret = alloc_mem_shm(td, total_mem);
      else if (td->o.mem_type == MEM_MMAP || td->o.mem_type == MEM_MMAPHUGE)
            ret = alloc_mem_mmap(td, total_mem);
      else {
            log_err("fio: bad mem type: %d\n", td->o.mem_type);
            ret = 1;
      }

      if (ret)
            td_verror(td, ENOMEM, "iomem allocation");

      return ret;
}

void free_io_mem(struct thread_data *td)
{
      unsigned int total_mem;

      total_mem = td->orig_buffer_size;
      if (td->o.odirect)
            total_mem += page_mask;

      if (td->o.mem_type == MEM_MALLOC)
            free_mem_malloc(td);
      else if (td->o.mem_type == MEM_SHM || td->o.mem_type == MEM_SHMHUGE)
            free_mem_shm(td);
      else if (td->o.mem_type == MEM_MMAP || td->o.mem_type == MEM_MMAPHUGE)
            free_mem_mmap(td, total_mem);
      else
            log_err("Bad memory type %u\n", td->o.mem_type);

      td->orig_buffer = NULL;
      td->orig_buffer_size = 0;
}

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