c25fb2aa39
We had a deadlock between: - free_process_memory_range (take lock) -> ihk_mc_pt_free_range -> ... -> remote_flush_tlb_array_cpumask -> "/* Wait for all cores */" and - obj_list_lookup() under fileobj_list_lock that disabled irqs and thus never ack'd the remote flush The rework is quite big but removes the need for the big lock, although devobj and shmobj needed a new smaller lock to be introduced - the new locks are used much more locally and should not cause problems. On the bright side, refcounting being moved to memobj level means we could remove refcounting implemented separately in all object types and simplifies code a bit. Change-Id: I6bc8438a98b1d8edddc91c4ac33c11b88e097ebb
112 lines
2.0 KiB
C
112 lines
2.0 KiB
C
/**
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* \file shm.h
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* License details are found in the file LICENSE.
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* \brief
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* header file for System V shared memory
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* \author Gou Nakamura <go.nakamura.yw@hitachi-solutions.com> \par
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* Copyright (C) 2014 - 2015 RIKEN AICS
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*/
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/*
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* HISTORY:
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*/
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#ifndef HEADER_SHM_H
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#define HEADER_SHM_H
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#include <list.h>
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#include <memobj.h>
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#include <arch/shm.h>
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enum {
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/* for key_t */
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IPC_PRIVATE = 0,
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/* for shmflg */
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IPC_CREAT = 01000,
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IPC_EXCL = 02000,
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SHM_HUGETLB = 04000,
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SHM_RDONLY = 010000,
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SHM_RND = 020000,
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SHM_REMAP = 040000,
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SHM_EXEC = 0100000,
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/* for shm_mode */
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SHM_DEST = 01000, /* Marked for destruction */
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SHM_LOCKED = 02000,
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/* for cmd of shmctl() */
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IPC_RMID = 0,
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IPC_SET = 1,
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IPC_STAT = 2,
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IPC_INFO = 3,
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SHM_LOCK = 11,
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SHM_UNLOCK = 12,
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SHM_STAT = 13,
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SHM_INFO = 14,
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};
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struct shmlock_user;
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struct shmobj {
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struct memobj memobj; /* must be first */
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int index;
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int pgshift;
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size_t real_segsz;
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struct shmlock_user * user;
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struct shmid_ds ds;
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struct list_head page_list;
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ihk_spinlock_t page_list_lock;
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struct list_head chain; /* shmobj_list */
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};
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struct shminfo {
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uint64_t shmmax;
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uint64_t shmmin;
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uint64_t shmmni;
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uint64_t shmseg;
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uint64_t shmall;
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uint8_t padding[32];
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};
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struct shm_info {
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int32_t used_ids;
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uint8_t padding[4];
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uint64_t shm_tot;
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uint64_t shm_rss;
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uint64_t shm_swp;
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uint64_t swap_attempts;
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uint64_t swap_successes;
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};
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struct shmlock_user {
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uid_t ruid;
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int padding;
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size_t locked;
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struct list_head chain;
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};
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extern ihk_spinlock_t shmlock_users_lock_body;
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static inline void shmlock_users_lock(void)
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{
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ihk_mc_spinlock_lock_noirq(&shmlock_users_lock_body);
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return;
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}
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static inline void shmlock_users_unlock(void)
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{
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ihk_mc_spinlock_unlock_noirq(&shmlock_users_lock_body);
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return;
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}
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void shmobj_list_lock(void);
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void shmobj_list_unlock(void);
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int shmobj_create_indexed(struct shmid_ds *ds, struct shmobj **objp);
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void shmlock_user_free(struct shmlock_user *user);
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int shmlock_user_get(uid_t ruid, struct shmlock_user **userp);
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#endif /* HEADER_SHM_H */
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