X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/316670eb35587141e969394ae8537d66b9211e80..143464d58d2bd6378e74eec636961ceb0d32fb91:/bsd/vm/dp_backing_file.c diff --git a/bsd/vm/dp_backing_file.c b/bsd/vm/dp_backing_file.c index 9df1b810e..cc52be8fb 100644 --- a/bsd/vm/dp_backing_file.c +++ b/bsd/vm/dp_backing_file.c @@ -77,6 +77,8 @@ #include #endif +void kprintf(const char *fmt, ...); + /* * temporary support for delayed instantiation * of default_pager @@ -159,6 +161,7 @@ backing_store_suspend_return: } extern boolean_t backing_store_stop_compaction; +extern boolean_t compressor_store_stop_compaction; /* * Routine: macx_backing_store_compaction @@ -182,9 +185,15 @@ macx_backing_store_compaction(int flags) if (flags & SWAP_COMPACT_DISABLE) { backing_store_stop_compaction = TRUE; + compressor_store_stop_compaction = TRUE; + + kprintf("backing_store_stop_compaction = TRUE\n"); } else if (flags & SWAP_COMPACT_ENABLE) { backing_store_stop_compaction = FALSE; + compressor_store_stop_compaction = FALSE; + + kprintf("backing_store_stop_compaction = FALSE\n"); } return 0; @@ -211,6 +220,33 @@ macx_triggers( extern boolean_t dp_isssd; +extern void vm_swap_init(void); +extern int vm_compressor_mode; + +/* + * In the compressed pager world, the swapfiles are created by the kernel. + * Well, all except the first one. That swapfile is absorbed by the kernel at + * the end of the macx_swapon function (if swap is enabled). That's why + * we allow the first invocation of macx_swapon to succeed. + * + * If the compressor pool is running low, the kernel messages the dynamic pager + * on the port it has registered with the kernel. That port can transport 1 of 2 + * pieces of information to dynamic pager: create a swapfile or delete a swapfile. + * + * We choose to transmit the former. So, that message tells dynamic pager + * to create a swapfile and activate it by calling macx_swapon. + * + * We deny this new macx_swapon request. That leads dynamic pager to interpret the + * failure as a serious error and notify all it's clients that swap is running low. + * That's how we get the loginwindow "Resume / Force Quit Applications" dialog to appear. + * + * NOTE: + * If the kernel has already created multiple swapfiles by the time the compressor + * pool is running low (and it has to play this trick), dynamic pager won't be able to + * create a file in user-space and, that too will lead to a similar notification blast + * to all of it's clients. So, that behaves as desired too. + */ +boolean_t macx_swapon_allowed = TRUE; /* * Routine: macx_swapon @@ -235,6 +271,19 @@ macx_swapon( struct proc *p = current_proc(); int dp_cluster_size; + if (COMPRESSED_PAGER_IS_ACTIVE) { + if (macx_swapon_allowed == FALSE) { + return EINVAL; + } else { + if ((vm_compressor_mode == VM_PAGER_COMPRESSOR_WITH_SWAP) || + (vm_compressor_mode == VM_PAGER_FREEZER_COMPRESSOR_WITH_SWAP)) { + vm_swap_init(); + } + + macx_swapon_allowed = FALSE; + return 0; + } + } AUDIT_MACH_SYSCALL_ENTER(AUE_SWAPON); AUDIT_ARG(value32, args->priority); @@ -319,9 +368,6 @@ macx_swapon( goto swapon_bailout; } -#if CONFIG_EMBEDDED - dp_cluster_size = 1 * PAGE_SIZE; -#else if ((dp_isssd = vnode_pager_isSSD(vp)) == TRUE) { /* * keep the cluster size small since the @@ -335,7 +381,6 @@ macx_swapon( */ dp_cluster_size = 0; } -#endif kr = default_pager_backing_store_create(default_pager, -1, /* default priority */ dp_cluster_size, @@ -423,7 +468,6 @@ macx_swapoff( int error; boolean_t funnel_state; vfs_context_t ctx = vfs_context_current(); - struct uthread *ut; int orig_iopol_disk; AUDIT_MACH_SYSCALL_ENTER(AUE_SWAPOFF); @@ -470,14 +514,16 @@ macx_swapoff( } backing_store = (mach_port_t)bs_port_table[i].bs; - ut = get_bsdthread_info(current_thread()); + orig_iopol_disk = proc_get_task_policy(current_task(), current_thread(), + TASK_POLICY_INTERNAL, TASK_POLICY_IOPOL); - orig_iopol_disk = proc_get_thread_selfdiskacc(); - proc_apply_thread_selfdiskacc(IOPOL_THROTTLE); + proc_set_task_policy(current_task(), current_thread(), TASK_POLICY_INTERNAL, + TASK_POLICY_IOPOL, IOPOL_THROTTLE); kr = default_pager_backing_store_delete(backing_store); - proc_apply_thread_selfdiskacc(orig_iopol_disk); + proc_set_task_policy(current_task(), current_thread(), TASK_POLICY_INTERNAL, + TASK_POLICY_IOPOL, orig_iopol_disk); switch (kr) { case KERN_SUCCESS: @@ -521,6 +567,11 @@ swapoff_bailout: * Function: * Syscall interface to get general swap statistics */ +extern uint64_t vm_swap_get_total_space(void); +extern uint64_t vm_swap_get_used_space(void); +extern uint64_t vm_swap_get_free_space(void); +extern boolean_t vm_swap_up; + int macx_swapinfo( memory_object_size_t *total_p, @@ -534,53 +585,71 @@ macx_swapinfo( kern_return_t kr; error = 0; + if (COMPRESSED_PAGER_IS_ACTIVE) { + + if (vm_swap_up == TRUE) { + + *total_p = vm_swap_get_total_space(); + *avail_p = vm_swap_get_free_space(); + *pagesize_p = PAGE_SIZE_64; + *encrypted_p = TRUE; + + } else { + + *total_p = 0; + *avail_p = 0; + *pagesize_p = 0; + *encrypted_p = FALSE; + } + } else { - /* - * Get a handle on the default pager. - */ - default_pager = MEMORY_OBJECT_DEFAULT_NULL; - kr = host_default_memory_manager(host_priv_self(), &default_pager, 0); - if (kr != KERN_SUCCESS) { - error = EAGAIN; /* XXX why EAGAIN ? */ - goto done; - } - if (default_pager == MEMORY_OBJECT_DEFAULT_NULL) { /* - * The default pager has not initialized yet, - * so it can't be using any swap space at all. + * Get a handle on the default pager. */ - *total_p = 0; - *avail_p = 0; - *pagesize_p = 0; - *encrypted_p = FALSE; - goto done; - } - - /* - * Get swap usage data from default pager. - */ - kr = default_pager_info_64(default_pager, &dpi64); - if (kr != KERN_SUCCESS) { - error = ENOTSUP; - goto done; - } + default_pager = MEMORY_OBJECT_DEFAULT_NULL; + kr = host_default_memory_manager(host_priv_self(), &default_pager, 0); + if (kr != KERN_SUCCESS) { + error = EAGAIN; /* XXX why EAGAIN ? */ + goto done; + } + if (default_pager == MEMORY_OBJECT_DEFAULT_NULL) { + /* + * The default pager has not initialized yet, + * so it can't be using any swap space at all. + */ + *total_p = 0; + *avail_p = 0; + *pagesize_p = 0; + *encrypted_p = FALSE; + goto done; + } + + /* + * Get swap usage data from default pager. + */ + kr = default_pager_info_64(default_pager, &dpi64); + if (kr != KERN_SUCCESS) { + error = ENOTSUP; + goto done; + } - /* - * Provide default pager info to caller. - */ - *total_p = dpi64.dpi_total_space; - *avail_p = dpi64.dpi_free_space; - *pagesize_p = dpi64.dpi_page_size; - if (dpi64.dpi_flags & DPI_ENCRYPTED) { - *encrypted_p = TRUE; - } else { - *encrypted_p = FALSE; - } + /* + * Provide default pager info to caller. + */ + *total_p = dpi64.dpi_total_space; + *avail_p = dpi64.dpi_free_space; + *pagesize_p = dpi64.dpi_page_size; + if (dpi64.dpi_flags & DPI_ENCRYPTED) { + *encrypted_p = TRUE; + } else { + *encrypted_p = FALSE; + } done: - if (default_pager != MEMORY_OBJECT_DEFAULT_NULL) { - /* release our handle on default pager */ - memory_object_default_deallocate(default_pager); + if (default_pager != MEMORY_OBJECT_DEFAULT_NULL) { + /* release our handle on default pager */ + memory_object_default_deallocate(default_pager); + } } return error; }