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git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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f88f0bdfc3
UBD at present is extremely slow because it handles only one request at a time in the IO thread and IRQ handler. The single request at a time is replaced by handling multiple requests as well as necessary workarounds for short reads/writes. Resulting performance improvement in disk IO - 30% Signed-off-by: Anton Ivanov <aivanov@kot-begemot.co.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
79 lines
1.5 KiB
C
79 lines
1.5 KiB
C
/*
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* Copyright (C) 2016 Anton Ivanov (aivanov@brocade.com)
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* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
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* Copyright (C) 2001 Ridgerun,Inc (glonnon@ridgerun.com)
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* Licensed under the GPL
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*/
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#include <stddef.h>
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#include <unistd.h>
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#include <errno.h>
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#include <sched.h>
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#include <signal.h>
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#include <string.h>
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#include <netinet/in.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <sys/mman.h>
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#include <sys/param.h>
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#include <endian.h>
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#include <byteswap.h>
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#include "ubd.h"
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#include <os.h>
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#include <poll.h>
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struct pollfd kernel_pollfd;
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int start_io_thread(unsigned long sp, int *fd_out)
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{
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int pid, fds[2], err;
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err = os_pipe(fds, 1, 1);
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if(err < 0){
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printk("start_io_thread - os_pipe failed, err = %d\n", -err);
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goto out;
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}
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kernel_fd = fds[0];
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kernel_pollfd.fd = kernel_fd;
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kernel_pollfd.events = POLLIN;
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*fd_out = fds[1];
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err = os_set_fd_block(*fd_out, 0);
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err = os_set_fd_block(kernel_fd, 0);
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if (err) {
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printk("start_io_thread - failed to set nonblocking I/O.\n");
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goto out_close;
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}
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pid = clone(io_thread, (void *) sp, CLONE_FILES | CLONE_VM, NULL);
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if(pid < 0){
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err = -errno;
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printk("start_io_thread - clone failed : errno = %d\n", errno);
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goto out_close;
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}
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return(pid);
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out_close:
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os_close_file(fds[0]);
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os_close_file(fds[1]);
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kernel_fd = -1;
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*fd_out = -1;
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out:
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return err;
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}
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int ubd_read_poll(int timeout)
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{
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kernel_pollfd.events = POLLIN;
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return poll(&kernel_pollfd, 1, timeout);
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}
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int ubd_write_poll(int timeout)
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{
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kernel_pollfd.events = POLLOUT;
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return poll(&kernel_pollfd, 1, timeout);
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}
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