]> git.proxmox.com Git - mirror_ubuntu-disco-kernel.git/commitdiff
revert "epoll: support for disabling items, and a self-test app"
authorAndrew Morton <akpm@linux-foundation.org>
Thu, 8 Nov 2012 23:53:35 +0000 (15:53 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 9 Nov 2012 05:41:46 +0000 (06:41 +0100)
Revert commit 03a7beb55b9f ("epoll: support for disabling items, and a
self-test app") pending resolution of the issues identified by Michael
Kerrisk, copied below.

We'll revisit this for 3.8.

: I've taken a look at this patch as it currently stands in 3.7-rc1, and
: done a bit of testing. (By the way, the test program
: tools/testing/selftests/epoll/test_epoll.c does not compile...)
:
: There are one or two places where the behavior seems a little strange,
: so I have a question or two at the end of this mail. But other than
: that, I want to check my understanding so that the interface can be
: correctly documented.
:
: Just to go though my understanding, the problem is the following
: scenario in a multithreaded application:
:
: 1. Multiple threads are performing epoll_wait() operations,
:    and maintaining a user-space cache that contains information
:    corresponding to each file descriptor being monitored by
:    epoll_wait().
:
: 2. At some point, a thread wants to delete (EPOLL_CTL_DEL)
:    a file descriptor from the epoll interest list, and
:    delete the corresponding record from the user-space cache.
:
: 3. The problem with (2) is that some other thread may have
:    previously done an epoll_wait() that retrieved information
:    about the fd in question, and may be in the middle of using
:    information in the cache that relates to that fd. Thus,
:    there is a potential race.
:
: 4. The race can't solved purely in user space, because doing
:    so would require applying a mutex across the epoll_wait()
:    call, which would of course blow thread concurrency.
:
: Right?
:
: Your solution is the EPOLL_CTL_DISABLE operation. I want to
: confirm my understanding about how to use this flag, since
: the description that has accompanied the patches so far
: has been a bit sparse
:
: 0. In the scenario you're concerned about, deleting a file
:    descriptor means (safely) doing the following:
:    (a) Deleting the file descriptor from the epoll interest list
:        using EPOLL_CTL_DEL
:    (b) Deleting the corresponding record in the user-space cache
:
: 1. It's only meaningful to use this EPOLL_CTL_DISABLE in
:    conjunction with EPOLLONESHOT.
:
: 2. Using EPOLL_CTL_DISABLE without using EPOLLONESHOT in
:    conjunction is a logical error.
:
: 3. The correct way to code multithreaded applications using
:    EPOLL_CTL_DISABLE and EPOLLONESHOT is as follows:
:
:    a. All EPOLL_CTL_ADD and EPOLL_CTL_MOD operations should
:       should EPOLLONESHOT.
:
:    b. When a thread wants to delete a file descriptor, it
:       should do the following:
:
:       [1] Call epoll_ctl(EPOLL_CTL_DISABLE)
:       [2] If the return status from epoll_ctl(EPOLL_CTL_DISABLE)
:           was zero, then the file descriptor can be safely
:           deleted by the thread that made this call.
:       [3] If the epoll_ctl(EPOLL_CTL_DISABLE) fails with EBUSY,
:           then the descriptor is in use. In this case, the calling
:           thread should set a flag in the user-space cache to
:           indicate that the thread that is using the descriptor
:           should perform the deletion operation.
:
: Is all of the above correct?
:
: The implementation depends on checking on whether
: (events & ~EP_PRIVATE_BITS) == 0
: This replies on the fact that EPOLL_CTL_AD and EPOLL_CTL_MOD always
: set EPOLLHUP and EPOLLERR in the 'events' mask, and EPOLLONESHOT
: causes those flags (as well as all others in ~EP_PRIVATE_BITS) to be
: cleared.
:
: A corollary to the previous paragraph is that using EPOLL_CTL_DISABLE
: is only useful in conjunction with EPOLLONESHOT. However, as things
: stand, one can use EPOLL_CTL_DISABLE on a file descriptor that does
: not have EPOLLONESHOT set in 'events' This results in the following
: (slightly surprising) behavior:
:
: (a) The first call to epoll_ctl(EPOLL_CTL_DISABLE) returns 0
:     (the indicator that the file descriptor can be safely deleted).
: (b) The next call to epoll_ctl(EPOLL_CTL_DISABLE) fails with EBUSY.
:
: This doesn't seem particularly useful, and in fact is probably an
: indication that the user made a logic error: they should only be using
: epoll_ctl(EPOLL_CTL_DISABLE) on a file descriptor for which
: EPOLLONESHOT was set in 'events'. If that is correct, then would it
: not make sense to return an error to user space for this case?

Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: "Paton J. Lewis" <palewis@adobe.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
fs/eventpoll.c
include/uapi/linux/eventpoll.h
tools/testing/selftests/Makefile
tools/testing/selftests/epoll/Makefile [deleted file]
tools/testing/selftests/epoll/test_epoll.c [deleted file]

index da72250ddc1cf2331336a23cbe8239bf880a10cf..cd96649bfe62da9e408dbd629f56f6452c139bc9 100644 (file)
@@ -346,7 +346,7 @@ static inline struct epitem *ep_item_from_epqueue(poll_table *p)
 /* Tells if the epoll_ctl(2) operation needs an event copy from userspace */
 static inline int ep_op_has_event(int op)
 {
-       return op == EPOLL_CTL_ADD || op == EPOLL_CTL_MOD;
+       return op != EPOLL_CTL_DEL;
 }
 
 /* Initialize the poll safe wake up structure */
@@ -676,34 +676,6 @@ static int ep_remove(struct eventpoll *ep, struct epitem *epi)
        return 0;
 }
 
-/*
- * Disables a "struct epitem" in the eventpoll set. Returns -EBUSY if the item
- * had no event flags set, indicating that another thread may be currently
- * handling that item's events (in the case that EPOLLONESHOT was being
- * used). Otherwise a zero result indicates that the item has been disabled
- * from receiving events. A disabled item may be re-enabled via
- * EPOLL_CTL_MOD. Must be called with "mtx" held.
- */
-static int ep_disable(struct eventpoll *ep, struct epitem *epi)
-{
-       int result = 0;
-       unsigned long flags;
-
-       spin_lock_irqsave(&ep->lock, flags);
-       if (epi->event.events & ~EP_PRIVATE_BITS) {
-               if (ep_is_linked(&epi->rdllink))
-                       list_del_init(&epi->rdllink);
-               /* Ensure ep_poll_callback will not add epi back onto ready
-                  list: */
-               epi->event.events &= EP_PRIVATE_BITS;
-               }
-       else
-               result = -EBUSY;
-       spin_unlock_irqrestore(&ep->lock, flags);
-
-       return result;
-}
-
 static void ep_free(struct eventpoll *ep)
 {
        struct rb_node *rbp;
@@ -1048,6 +1020,8 @@ static void ep_rbtree_insert(struct eventpoll *ep, struct epitem *epi)
        rb_insert_color(&epi->rbn, &ep->rbr);
 }
 
+
+
 #define PATH_ARR_SIZE 5
 /*
  * These are the number paths of length 1 to 5, that we are allowing to emanate
@@ -1813,12 +1787,6 @@ SYSCALL_DEFINE4(epoll_ctl, int, epfd, int, op, int, fd,
                } else
                        error = -ENOENT;
                break;
-       case EPOLL_CTL_DISABLE:
-               if (epi)
-                       error = ep_disable(ep, epi);
-               else
-                       error = -ENOENT;
-               break;
        }
        mutex_unlock(&ep->mtx);
 
index 8c99ce7202c53bcd93887c93dd8d8e75ebcd8aa2..2c267bcbb85c1c4e31b676127db7686d8d027e09 100644 (file)
@@ -25,7 +25,6 @@
 #define EPOLL_CTL_ADD 1
 #define EPOLL_CTL_DEL 2
 #define EPOLL_CTL_MOD 3
-#define EPOLL_CTL_DISABLE 4
 
 /*
  * Request the handling of system wakeup events so as to prevent system suspends
index 43480149119ee773f0a32cc8abe995903609fd11..85baf11e2acd7d11aa4990a0f7f53f8d28689a20 100644 (file)
@@ -1,4 +1,4 @@
-TARGETS = breakpoints kcmp mqueue vm cpu-hotplug memory-hotplug epoll
+TARGETS = breakpoints kcmp mqueue vm cpu-hotplug memory-hotplug
 
 all:
        for TARGET in $(TARGETS); do \
diff --git a/tools/testing/selftests/epoll/Makefile b/tools/testing/selftests/epoll/Makefile
deleted file mode 100644 (file)
index 19806ed..0000000
+++ /dev/null
@@ -1,11 +0,0 @@
-# Makefile for epoll selftests
-
-all: test_epoll
-%: %.c
-       gcc -pthread -g -o $@ $^
-
-run_tests: all
-       ./test_epoll
-
-clean:
-       $(RM) test_epoll
diff --git a/tools/testing/selftests/epoll/test_epoll.c b/tools/testing/selftests/epoll/test_epoll.c
deleted file mode 100644 (file)
index f752539..0000000
+++ /dev/null
@@ -1,344 +0,0 @@
-/*
- *  tools/testing/selftests/epoll/test_epoll.c
- *
- *  Copyright 2012 Adobe Systems Incorporated
- *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  Paton J. Lewis <palewis@adobe.com>
- *
- */
-
-#include <errno.h>
-#include <fcntl.h>
-#include <pthread.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <sys/epoll.h>
-#include <sys/socket.h>
-
-/*
- * A pointer to an epoll_item_private structure will be stored in the epoll
- * item's event structure so that we can get access to the epoll_item_private
- * data after calling epoll_wait:
- */
-struct epoll_item_private {
-       int index;  /* Position of this struct within the epoll_items array. */
-       int fd;
-       uint32_t events;
-       pthread_mutex_t mutex;  /* Guards the following variables... */
-       int stop;
-       int status;  /* Stores any error encountered while handling item. */
-       /* The following variable allows us to test whether we have encountered
-          a problem while attempting to cancel and delete the associated
-          event. When the test program exits, 'deleted' should be exactly
-          one. If it is greater than one, then the failed test reflects a real
-          world situation where we would have tried to access the epoll item's
-          private data after deleting it: */
-       int deleted;
-};
-
-struct epoll_item_private *epoll_items;
-
-/*
- * Delete the specified item from the epoll set. In a real-world secneario this
- * is where we would free the associated data structure, but in this testing
- * environment we retain the structure so that we can test for double-deletion:
- */
-void delete_item(int index)
-{
-       __sync_fetch_and_add(&epoll_items[index].deleted, 1);
-}
-
-/*
- * A pointer to a read_thread_data structure will be passed as the argument to
- * each read thread:
- */
-struct read_thread_data {
-       int stop;
-       int status;  /* Indicates any error encountered by the read thread. */
-       int epoll_set;
-};
-
-/*
- * The function executed by the read threads:
- */
-void *read_thread_function(void *function_data)
-{
-       struct read_thread_data *thread_data =
-               (struct read_thread_data *)function_data;
-       struct epoll_event event_data;
-       struct epoll_item_private *item_data;
-       char socket_data;
-
-       /* Handle events until we encounter an error or this thread's 'stop'
-          condition is set: */
-       while (1) {
-               int result = epoll_wait(thread_data->epoll_set,
-                                       &event_data,
-                                       1,      /* Number of desired events */
-                                       1000);  /* Timeout in ms */
-               if (result < 0) {
-                       /* Breakpoints signal all threads. Ignore that while
-                          debugging: */
-                       if (errno == EINTR)
-                               continue;
-                       thread_data->status = errno;
-                       return 0;
-               } else if (thread_data->stop)
-                       return 0;
-               else if (result == 0)  /* Timeout */
-                       continue;
-
-               /* We need the mutex here because checking for the stop
-                  condition and re-enabling the epoll item need to be done
-                  together as one atomic operation when EPOLL_CTL_DISABLE is
-                  available: */
-               item_data = (struct epoll_item_private *)event_data.data.ptr;
-               pthread_mutex_lock(&item_data->mutex);
-
-               /* Remove the item from the epoll set if we want to stop
-                  handling that event: */
-               if (item_data->stop)
-                       delete_item(item_data->index);
-               else {
-                       /* Clear the data that was written to the other end of
-                          our non-blocking socket: */
-                       do {
-                               if (read(item_data->fd, &socket_data, 1) < 1) {
-                                       if ((errno == EAGAIN) ||
-                                           (errno == EWOULDBLOCK))
-                                               break;
-                                       else
-                                               goto error_unlock;
-                               }
-                       } while (item_data->events & EPOLLET);
-
-                       /* The item was one-shot, so re-enable it: */
-                       event_data.events = item_data->events;
-                       if (epoll_ctl(thread_data->epoll_set,
-                                                 EPOLL_CTL_MOD,
-                                                 item_data->fd,
-                                                 &event_data) < 0)
-                               goto error_unlock;
-               }
-
-               pthread_mutex_unlock(&item_data->mutex);
-       }
-
-error_unlock:
-       thread_data->status = item_data->status = errno;
-       pthread_mutex_unlock(&item_data->mutex);
-       return 0;
-}
-
-/*
- * A pointer to a write_thread_data structure will be passed as the argument to
- * the write thread:
- */
-struct write_thread_data {
-       int stop;
-       int status;  /* Indicates any error encountered by the write thread. */
-       int n_fds;
-       int *fds;
-};
-
-/*
- * The function executed by the write thread. It writes a single byte to each
- * socket in turn until the stop condition for this thread is set. If writing to
- * a socket would block (i.e. errno was EAGAIN), we leave that socket alone for
- * the moment and just move on to the next socket in the list. We don't care
- * about the order in which we deliver events to the epoll set. In fact we don't
- * care about the data we're writing to the pipes at all; we just want to
- * trigger epoll events:
- */
-void *write_thread_function(void *function_data)
-{
-       const char data = 'X';
-       int index;
-       struct write_thread_data *thread_data =
-               (struct write_thread_data *)function_data;
-       while (!thread_data->stop)
-               for (index = 0;
-                    !thread_data->stop && (index < thread_data->n_fds);
-                    ++index)
-                       if ((write(thread_data->fds[index], &data, 1) < 1) &&
-                               (errno != EAGAIN) &&
-                               (errno != EWOULDBLOCK)) {
-                               thread_data->status = errno;
-                               return;
-                       }
-}
-
-/*
- * Arguments are currently ignored:
- */
-int main(int argc, char **argv)
-{
-       const int n_read_threads = 100;
-       const int n_epoll_items = 500;
-       int index;
-       int epoll_set = epoll_create1(0);
-       struct write_thread_data write_thread_data = {
-               0, 0, n_epoll_items, malloc(n_epoll_items * sizeof(int))
-       };
-       struct read_thread_data *read_thread_data =
-               malloc(n_read_threads * sizeof(struct read_thread_data));
-       pthread_t *read_threads = malloc(n_read_threads * sizeof(pthread_t));
-       pthread_t write_thread;
-
-       printf("-----------------\n");
-       printf("Runing test_epoll\n");
-       printf("-----------------\n");
-
-       epoll_items = malloc(n_epoll_items * sizeof(struct epoll_item_private));
-
-       if (epoll_set < 0 || epoll_items == 0 || write_thread_data.fds == 0 ||
-               read_thread_data == 0 || read_threads == 0)
-               goto error;
-
-       if (sysconf(_SC_NPROCESSORS_ONLN) < 2) {
-               printf("Error: please run this test on a multi-core system.\n");
-               goto error;
-       }
-
-       /* Create the socket pairs and epoll items: */
-       for (index = 0; index < n_epoll_items; ++index) {
-               int socket_pair[2];
-               struct epoll_event event_data;
-               if (socketpair(AF_UNIX,
-                              SOCK_STREAM | SOCK_NONBLOCK,
-                              0,
-                              socket_pair) < 0)
-                       goto error;
-               write_thread_data.fds[index] = socket_pair[0];
-               epoll_items[index].index = index;
-               epoll_items[index].fd = socket_pair[1];
-               if (pthread_mutex_init(&epoll_items[index].mutex, NULL) != 0)
-                       goto error;
-               /* We always use EPOLLONESHOT because this test is currently
-                  structured to demonstrate the need for EPOLL_CTL_DISABLE,
-                  which only produces useful information in the EPOLLONESHOT
-                  case (without EPOLLONESHOT, calling epoll_ctl with
-                  EPOLL_CTL_DISABLE will never return EBUSY). If support for
-                  testing events without EPOLLONESHOT is desired, it should
-                  probably be implemented in a separate unit test. */
-               epoll_items[index].events = EPOLLIN | EPOLLONESHOT;
-               if (index < n_epoll_items / 2)
-                       epoll_items[index].events |= EPOLLET;
-               epoll_items[index].stop = 0;
-               epoll_items[index].status = 0;
-               epoll_items[index].deleted = 0;
-               event_data.events = epoll_items[index].events;
-               event_data.data.ptr = &epoll_items[index];
-               if (epoll_ctl(epoll_set,
-                             EPOLL_CTL_ADD,
-                             epoll_items[index].fd,
-                             &event_data) < 0)
-                       goto error;
-       }
-
-       /* Create and start the read threads: */
-       for (index = 0; index < n_read_threads; ++index) {
-               read_thread_data[index].stop = 0;
-               read_thread_data[index].status = 0;
-               read_thread_data[index].epoll_set = epoll_set;
-               if (pthread_create(&read_threads[index],
-                                  NULL,
-                                  read_thread_function,
-                                  &read_thread_data[index]) != 0)
-                       goto error;
-       }
-
-       if (pthread_create(&write_thread,
-                          NULL,
-                          write_thread_function,
-                          &write_thread_data) != 0)
-               goto error;
-
-       /* Cancel all event pollers: */
-#ifdef EPOLL_CTL_DISABLE
-       for (index = 0; index < n_epoll_items; ++index) {
-               pthread_mutex_lock(&epoll_items[index].mutex);
-               ++epoll_items[index].stop;
-               if (epoll_ctl(epoll_set,
-                             EPOLL_CTL_DISABLE,
-                             epoll_items[index].fd,
-                             NULL) == 0)
-                       delete_item(index);
-               else if (errno != EBUSY) {
-                       pthread_mutex_unlock(&epoll_items[index].mutex);
-                       goto error;
-               }
-               /* EBUSY means events were being handled; allow the other thread
-                  to delete the item. */
-               pthread_mutex_unlock(&epoll_items[index].mutex);
-       }
-#else
-       for (index = 0; index < n_epoll_items; ++index) {
-               pthread_mutex_lock(&epoll_items[index].mutex);
-               ++epoll_items[index].stop;
-               pthread_mutex_unlock(&epoll_items[index].mutex);
-               /* Wait in case a thread running read_thread_function is
-                  currently executing code between epoll_wait and
-                  pthread_mutex_lock with this item. Note that a longer delay
-                  would make double-deletion less likely (at the expense of
-                  performance), but there is no guarantee that any delay would
-                  ever be sufficient. Note also that we delete all event
-                  pollers at once for testing purposes, but in a real-world
-                  environment we are likely to want to be able to cancel event
-                  pollers at arbitrary times. Therefore we can't improve this
-                  situation by just splitting this loop into two loops
-                  (i.e. signal 'stop' for all items, sleep, and then delete all
-                  items). We also can't fix the problem via EPOLL_CTL_DEL
-                  because that command can't prevent the case where some other
-                  thread is executing read_thread_function within the region
-                  mentioned above: */
-               usleep(1);
-               pthread_mutex_lock(&epoll_items[index].mutex);
-               if (!epoll_items[index].deleted)
-                       delete_item(index);
-               pthread_mutex_unlock(&epoll_items[index].mutex);
-       }
-#endif
-
-       /* Shut down the read threads: */
-       for (index = 0; index < n_read_threads; ++index)
-               __sync_fetch_and_add(&read_thread_data[index].stop, 1);
-       for (index = 0; index < n_read_threads; ++index) {
-               if (pthread_join(read_threads[index], NULL) != 0)
-                       goto error;
-               if (read_thread_data[index].status)
-                       goto error;
-       }
-
-       /* Shut down the write thread: */
-       __sync_fetch_and_add(&write_thread_data.stop, 1);
-       if ((pthread_join(write_thread, NULL) != 0) || write_thread_data.status)
-               goto error;
-
-       /* Check for final error conditions: */
-       for (index = 0; index < n_epoll_items; ++index) {
-               if (epoll_items[index].status != 0)
-                       goto error;
-               if (pthread_mutex_destroy(&epoll_items[index].mutex) < 0)
-                       goto error;
-       }
-       for (index = 0; index < n_epoll_items; ++index)
-               if (epoll_items[index].deleted != 1) {
-                       printf("Error: item data deleted %1d times.\n",
-                                  epoll_items[index].deleted);
-                       goto error;
-               }
-
-       printf("[PASS]\n");
-       return 0;
-
- error:
-       printf("[FAIL]\n");
-       return errno;
-}