This is xnu-11215.1.10. See this file in:
/*
* Copyright (c) 2016-2024 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. The rights granted to you under the License
* may not be used to create, or enable the creation or redistribution of,
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
*
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
#include <skywalk/os_skywalk_private.h>
#include <machine/limits.h>
#include <machine/machine_routines.h>
#include <vm/vm_pageout.h>
/*
* Region templates.
*
* Regions that are not eligible for user task mapping must never be
* marked with the SKMEM_REGION_CR_MMAPOK flag. Such regions will
* automatically be excluded from the mappable region array at arena
* creation time.
*
* Regions that allow their objects to be shared among other objects
* must be marked with SKMEM_REGION_CR_SHAREOK. This permits calls
* to skmem_bufctl_{use,unuse}() on the bufctls for the objects.
*
* Read-only regions must be marked with SKMEM_REGION_CR_UREADONLY.
* This will affect the protection property of the segments in those
* regions. This flag has no effect when the region is not mappable
* to a user task.
*
* The SKMEM_REGION_CR_NOMAGAZINES flag marks the region as unsupportive
* of the magazines layer when used by a skmem_cache. When this flag is
* not set, the number of objects in the region will be adjusted to
* include the worst-case number of objects cached at the CPU layer.
* By default, all regions have this flag set; this may be overridden
* by each client (after making a copy).
*
* Regions that don't support multi-segments can be marked with the
* SKMEM_REGION_CR_MONOLITHIC flag. This forces exactly one segment
* to cover all objects in the region. This also effectively caps
* the skmem_cache slab layer to have only a single slab.
*
* The correctness of the region templates is enforced at arena
* creation time.
*/
static const struct skmem_region_params skmem_regions[SKMEM_REGIONS] = {
/*
* Leading guard page(s): {mappable, no-read-write, no-cache}
*/
[SKMEM_REGION_GUARD_HEAD] = {
.srp_name = "headguard",
.srp_id = SKMEM_REGION_GUARD_HEAD,
.srp_cflags = SKMEM_REGION_CR_MMAPOK |
SKMEM_REGION_CR_GUARD | SKMEM_REGION_CR_NOMAGAZINES |
SKMEM_REGION_CR_NOREDIRECT,
.srp_md_type = NEXUS_META_TYPE_INVALID,
.srp_md_subtype = NEXUS_META_SUBTYPE_INVALID,
},
/*
* Schema: {mappable, read-only, no-cache}
*/
[SKMEM_REGION_SCHEMA] = {
.srp_name = "schema",
.srp_id = SKMEM_REGION_SCHEMA,
.srp_cflags = SKMEM_REGION_CR_MMAPOK |
SKMEM_REGION_CR_UREADONLY | SKMEM_REGION_CR_NOMAGAZINES |
SKMEM_REGION_CR_NOREDIRECT | SKMEM_REGION_CR_PUREDATA,
.srp_md_type = NEXUS_META_TYPE_INVALID,
.srp_md_subtype = NEXUS_META_SUBTYPE_INVALID,
},
/*
* Rings: {mappable, no-cache}
*/
[SKMEM_REGION_RING] = {
.srp_name = "ring",
.srp_id = SKMEM_REGION_RING,
.srp_cflags = SKMEM_REGION_CR_MMAPOK |
SKMEM_REGION_CR_NOMAGAZINES | SKMEM_REGION_CR_PUREDATA,
.srp_md_type = NEXUS_META_TYPE_INVALID,
.srp_md_subtype = NEXUS_META_SUBTYPE_INVALID,
},
/*
* Buffers: {mappable, shareable}
*/
[SKMEM_REGION_BUF_DEF] = {
.srp_name = "buf_def",
.srp_id = SKMEM_REGION_BUF_DEF,
.srp_cflags = SKMEM_REGION_CR_MMAPOK |
SKMEM_REGION_CR_NOMAGAZINES | SKMEM_REGION_CR_IODIR_IN |
SKMEM_REGION_CR_IODIR_OUT | SKMEM_REGION_CR_SHAREOK |
SKMEM_REGION_CR_PUREDATA,
.srp_md_type = NEXUS_META_TYPE_INVALID,
.srp_md_subtype = NEXUS_META_SUBTYPE_INVALID,
},
[SKMEM_REGION_BUF_LARGE] = {
.srp_name = "buf_large",
.srp_id = SKMEM_REGION_BUF_LARGE,
.srp_cflags = SKMEM_REGION_CR_MMAPOK |
SKMEM_REGION_CR_NOMAGAZINES | SKMEM_REGION_CR_IODIR_IN |
SKMEM_REGION_CR_IODIR_OUT | SKMEM_REGION_CR_SHAREOK |
SKMEM_REGION_CR_PUREDATA,
.srp_md_type = NEXUS_META_TYPE_INVALID,
.srp_md_subtype = NEXUS_META_SUBTYPE_INVALID,
},
[SKMEM_REGION_RXBUF_DEF] = {
.srp_name = "rxbuf_def",
.srp_id = SKMEM_REGION_RXBUF_DEF,
.srp_cflags = SKMEM_REGION_CR_MMAPOK |
SKMEM_REGION_CR_NOMAGAZINES | SKMEM_REGION_CR_IODIR_IN |
SKMEM_REGION_CR_SHAREOK | SKMEM_REGION_CR_PUREDATA,
.srp_r_obj_cnt = 0,
.srp_md_type = NEXUS_META_TYPE_INVALID,
.srp_md_subtype = NEXUS_META_SUBTYPE_INVALID,
},
[SKMEM_REGION_RXBUF_LARGE] = {
.srp_name = "rxbuf_large",
.srp_id = SKMEM_REGION_RXBUF_LARGE,
.srp_cflags = SKMEM_REGION_CR_MMAPOK |
SKMEM_REGION_CR_NOMAGAZINES | SKMEM_REGION_CR_IODIR_IN |
SKMEM_REGION_CR_SHAREOK | SKMEM_REGION_CR_PUREDATA,
.srp_r_obj_cnt = 0,
.srp_md_type = NEXUS_META_TYPE_INVALID,
.srp_md_subtype = NEXUS_META_SUBTYPE_INVALID,
},
[SKMEM_REGION_TXBUF_DEF] = {
.srp_name = "txbuf_def",
.srp_id = SKMEM_REGION_TXBUF_DEF,
.srp_cflags = SKMEM_REGION_CR_MMAPOK |
SKMEM_REGION_CR_NOMAGAZINES | SKMEM_REGION_CR_IODIR_OUT |
SKMEM_REGION_CR_SHAREOK | SKMEM_REGION_CR_PUREDATA,
.srp_r_obj_cnt = 0,
.srp_md_type = NEXUS_META_TYPE_INVALID,
.srp_md_subtype = NEXUS_META_SUBTYPE_INVALID,
},
[SKMEM_REGION_TXBUF_LARGE] = {
.srp_name = "txbuf_large",
.srp_id = SKMEM_REGION_TXBUF_LARGE,
.srp_cflags = SKMEM_REGION_CR_MMAPOK |
SKMEM_REGION_CR_NOMAGAZINES | SKMEM_REGION_CR_IODIR_OUT |
SKMEM_REGION_CR_SHAREOK | SKMEM_REGION_CR_PUREDATA,
.srp_r_obj_cnt = 0,
.srp_md_type = NEXUS_META_TYPE_INVALID,
.srp_md_subtype = NEXUS_META_SUBTYPE_INVALID,
},
/*
* Userspace metadata: {mappable}
*/
[SKMEM_REGION_UMD] = {
.srp_name = "umd",
.srp_id = SKMEM_REGION_UMD,
.srp_cflags = SKMEM_REGION_CR_MMAPOK |
SKMEM_REGION_CR_NOMAGAZINES,
.srp_md_type = NEXUS_META_TYPE_QUANTUM,
.srp_md_subtype = NEXUS_META_SUBTYPE_PAYLOAD,
.srp_max_frags = 1,
},
/*
* Userspace buflet metadata: {mappable}
*/
[SKMEM_REGION_UBFT] = {
.srp_name = "ubft",
.srp_id = SKMEM_REGION_UBFT,
.srp_cflags = SKMEM_REGION_CR_MMAPOK |
SKMEM_REGION_CR_NOMAGAZINES,
.srp_r_obj_cnt = 0,
.srp_md_type = NEXUS_META_TYPE_INVALID,
.srp_md_subtype = NEXUS_META_SUBTYPE_INVALID,
.srp_max_frags = 1,
},
/*
* Tx/alloc userspace slot descriptors: {mappable, read-only, no-cache}
*/
[SKMEM_REGION_TXAUSD] = {
.srp_name = "txausd",
.srp_id = SKMEM_REGION_TXAUSD,
.srp_cflags = SKMEM_REGION_CR_MMAPOK |
SKMEM_REGION_CR_UREADONLY | SKMEM_REGION_CR_NOMAGAZINES,
.srp_md_type = NEXUS_META_TYPE_INVALID,
.srp_md_subtype = NEXUS_META_SUBTYPE_INVALID,
},
/*
* Rx/free userspace slot descriptors: {mappable, read-only, no-cache}
*/
[SKMEM_REGION_RXFUSD] = {
.srp_name = "rxfusd",
.srp_id = SKMEM_REGION_RXFUSD,
.srp_cflags = SKMEM_REGION_CR_MMAPOK |
SKMEM_REGION_CR_UREADONLY | SKMEM_REGION_CR_NOMAGAZINES,
.srp_md_type = NEXUS_META_TYPE_INVALID,
.srp_md_subtype = NEXUS_META_SUBTYPE_INVALID,
},
/*
* Shared statistics: {mappable, monolithic, no-cache}
*/
[SKMEM_REGION_USTATS] = {
.srp_name = "ustats",
.srp_id = SKMEM_REGION_USTATS,
.srp_cflags = SKMEM_REGION_CR_MMAPOK |
SKMEM_REGION_CR_MONOLITHIC | SKMEM_REGION_CR_NOMAGAZINES |
SKMEM_REGION_CR_PUREDATA,
.srp_md_type = NEXUS_META_TYPE_INVALID,
.srp_md_subtype = NEXUS_META_SUBTYPE_INVALID,
},
/*
* Flow advisories: {mappable, read-only, monolithic, no-cache}
*/
[SKMEM_REGION_FLOWADV] = {
.srp_name = "flowadv",
.srp_id = SKMEM_REGION_FLOWADV,
.srp_cflags = SKMEM_REGION_CR_MMAPOK |
SKMEM_REGION_CR_UREADONLY | SKMEM_REGION_CR_MONOLITHIC |
SKMEM_REGION_CR_NOMAGAZINES | SKMEM_REGION_CR_PUREDATA,
.srp_md_type = NEXUS_META_TYPE_INVALID,
.srp_md_subtype = NEXUS_META_SUBTYPE_INVALID,
},
/*
* Nexus advisories: {mappable, read-only, monolithic, no-cache}
*/
[SKMEM_REGION_NEXUSADV] = {
.srp_name = "nexusadv",
.srp_id = SKMEM_REGION_NEXUSADV,
.srp_cflags = SKMEM_REGION_CR_MMAPOK |
SKMEM_REGION_CR_UREADONLY | SKMEM_REGION_CR_MONOLITHIC |
SKMEM_REGION_CR_NOMAGAZINES | SKMEM_REGION_CR_PERSISTENT |
SKMEM_REGION_CR_PUREDATA,
.srp_md_type = NEXUS_META_TYPE_INVALID,
.srp_md_subtype = NEXUS_META_SUBTYPE_INVALID,
},
/*
* sysctls: {mappable, monolithic, no-cache}
*/
[SKMEM_REGION_SYSCTLS] = {
.srp_name = "sysctls",
.srp_id = SKMEM_REGION_SYSCTLS,
.srp_cflags = SKMEM_REGION_CR_MMAPOK |
SKMEM_REGION_CR_UREADONLY | SKMEM_REGION_CR_MONOLITHIC |
SKMEM_REGION_CR_NOMAGAZINES | SKMEM_REGION_CR_NOREDIRECT |
SKMEM_REGION_CR_PUREDATA,
.srp_md_type = NEXUS_META_TYPE_INVALID,
.srp_md_subtype = NEXUS_META_SUBTYPE_INVALID,
},
/*
* Trailing guard page(s): {mappable, no-read-write, no-cache}
*/
[SKMEM_REGION_GUARD_TAIL] = {
.srp_name = "tailguard",
.srp_id = SKMEM_REGION_GUARD_TAIL,
.srp_cflags = SKMEM_REGION_CR_MMAPOK |
SKMEM_REGION_CR_GUARD | SKMEM_REGION_CR_NOMAGAZINES |
SKMEM_REGION_CR_NOREDIRECT,
.srp_md_type = NEXUS_META_TYPE_INVALID,
.srp_md_subtype = NEXUS_META_SUBTYPE_INVALID,
},
/*
* Kernel metadata.
*/
[SKMEM_REGION_KMD] = {
.srp_name = "kmd",
.srp_id = SKMEM_REGION_KMD,
.srp_cflags = SKMEM_REGION_CR_NOMAGAZINES |
SKMEM_REGION_CR_MEMTAG,
.srp_md_type = NEXUS_META_TYPE_QUANTUM,
.srp_md_subtype = NEXUS_META_SUBTYPE_PAYLOAD,
.srp_max_frags = 1,
},
[SKMEM_REGION_RXKMD] = {
.srp_name = "rxkmd",
.srp_id = SKMEM_REGION_RXKMD,
.srp_cflags = SKMEM_REGION_CR_NOMAGAZINES |
SKMEM_REGION_CR_MEMTAG,
.srp_r_obj_cnt = 0,
.srp_md_type = NEXUS_META_TYPE_QUANTUM,
.srp_md_subtype = NEXUS_META_SUBTYPE_PAYLOAD,
.srp_max_frags = 1,
},
[SKMEM_REGION_TXKMD] = {
.srp_name = "txkmd",
.srp_id = SKMEM_REGION_TXKMD,
.srp_cflags = SKMEM_REGION_CR_NOMAGAZINES |
SKMEM_REGION_CR_MEMTAG,
.srp_r_obj_cnt = 0,
.srp_md_type = NEXUS_META_TYPE_QUANTUM,
.srp_md_subtype = NEXUS_META_SUBTYPE_PAYLOAD,
.srp_max_frags = 1,
},
/*
* kernel buflet metadata.
*/
[SKMEM_REGION_KBFT] = {
.srp_name = "kbft",
.srp_id = SKMEM_REGION_KBFT,
.srp_cflags = SKMEM_REGION_CR_NOMAGAZINES |
SKMEM_REGION_CR_MEMTAG,
.srp_r_obj_cnt = 0,
.srp_md_type = NEXUS_META_TYPE_INVALID,
.srp_md_subtype = NEXUS_META_SUBTYPE_INVALID,
},
[SKMEM_REGION_RXKBFT] = {
.srp_name = "rxkbft",
.srp_id = SKMEM_REGION_RXKBFT,
.srp_cflags = SKMEM_REGION_CR_NOMAGAZINES |
SKMEM_REGION_CR_MEMTAG,
.srp_r_obj_cnt = 0,
.srp_md_type = NEXUS_META_TYPE_INVALID,
.srp_md_subtype = NEXUS_META_SUBTYPE_INVALID,
},
[SKMEM_REGION_TXKBFT] = {
.srp_name = "txkbft",
.srp_id = SKMEM_REGION_TXKBFT,
.srp_cflags = SKMEM_REGION_CR_NOMAGAZINES |
SKMEM_REGION_CR_MEMTAG,
.srp_r_obj_cnt = 0,
.srp_md_type = NEXUS_META_TYPE_INVALID,
.srp_md_subtype = NEXUS_META_SUBTYPE_INVALID,
},
/*
* Tx/alloc kernel slot descriptors: {no-cache}
*/
[SKMEM_REGION_TXAKSD] = {
.srp_name = "txaksd",
.srp_id = SKMEM_REGION_TXAKSD,
.srp_cflags = SKMEM_REGION_CR_NOMAGAZINES,
.srp_md_type = NEXUS_META_TYPE_INVALID,
.srp_md_subtype = NEXUS_META_SUBTYPE_INVALID,
},
/*
* Rx/free kernel slot descriptors: {no-cache}
*/
[SKMEM_REGION_RXFKSD] = {
.srp_name = "rxfksd",
.srp_id = SKMEM_REGION_RXFKSD,
.srp_cflags = SKMEM_REGION_CR_NOMAGAZINES,
.srp_md_type = NEXUS_META_TYPE_INVALID,
.srp_md_subtype = NEXUS_META_SUBTYPE_INVALID,
},
/*
* Statistics kernel snapshot: {no-cache}
*/
[SKMEM_REGION_KSTATS] = {
.srp_name = "kstats",
.srp_id = SKMEM_REGION_KSTATS,
.srp_cflags = SKMEM_REGION_CR_MONOLITHIC |
SKMEM_REGION_CR_NOMAGAZINES | SKMEM_REGION_CR_PUREDATA,
.srp_md_type = NEXUS_META_TYPE_INVALID,
.srp_md_subtype = NEXUS_META_SUBTYPE_INVALID,
},
/*
* Intrinsic objects.
*/
[SKMEM_REGION_INTRINSIC] = {
.srp_name = "intrinsic",
.srp_id = SKMEM_REGION_INTRINSIC,
.srp_cflags = SKMEM_REGION_CR_PSEUDO,
.srp_md_type = NEXUS_META_TYPE_INVALID,
.srp_md_subtype = NEXUS_META_SUBTYPE_INVALID,
},
};
const skmem_region_id_t skmem_pp_region_ids[SKMEM_PP_REGIONS] = {
SKMEM_REGION_BUF_DEF,
SKMEM_REGION_BUF_LARGE,
SKMEM_REGION_RXBUF_DEF,
SKMEM_REGION_RXBUF_LARGE,
SKMEM_REGION_TXBUF_DEF,
SKMEM_REGION_TXBUF_LARGE,
SKMEM_REGION_KMD,
SKMEM_REGION_RXKMD,
SKMEM_REGION_TXKMD,
SKMEM_REGION_UMD,
SKMEM_REGION_KBFT,
SKMEM_REGION_RXKBFT,
SKMEM_REGION_TXKBFT,
SKMEM_REGION_UBFT
};
/* CPU cache line (determined at runtime) */
static unsigned int cpu_cache_line_size;
LCK_ATTR_DECLARE(skmem_lock_attr, 0, 0);
LCK_GRP_DECLARE(skmem_lock_grp, "skmem");
#if (DEVELOPMENT || DEBUG)
SYSCTL_NODE(_kern_skywalk, OID_AUTO, mem, CTLFLAG_RW | CTLFLAG_LOCKED,
0, "Skywalk kmem");
#endif /* (DEVELOPMENT || DEBUG) */
#define SK_SYS_OBJSIZE_DEFAULT (16 * 1024)
/* system-wide sysctls region */
static struct skmem_region *sk_sys_region;
uint32_t sk_sys_objsize;
void *__sized_by_or_null(sk_sys_objsize) sk_sys_obj;
static void skmem_sys_region_init(void);
static void skmem_sys_region_fini(void);
static char *__indexable skmem_dump_buf;
#define SKMEM_DUMP_BUF_SIZE 2048 /* size of dump buffer */
static int __skmem_inited = 0;
void
skmem_init(void)
{
ASSERT(!__skmem_inited);
/* get CPU cache line size */
(void) skmem_cpu_cache_line_size();
skmem_cache_pre_init();
skmem_region_init();
skmem_cache_init();
pp_init();
__skmem_inited = 1;
/* set up system-wide region for sysctls */
skmem_sys_region_init();
}
void
skmem_fini(void)
{
if (__skmem_inited) {
skmem_sys_region_fini();
pp_fini();
skmem_cache_fini();
skmem_region_fini();
__skmem_inited = 0;
}
}
/*
* Return the default region parameters (template). Callers must never
* modify the returned region, and should treat it as invariant.
*/
const struct skmem_region_params *
skmem_get_default(skmem_region_id_t id)
{
ASSERT(id < SKMEM_REGIONS);
return &skmem_regions[id];
}
/*
* Return the CPU cache line size.
*/
uint32_t
skmem_cpu_cache_line_size(void)
{
if (__improbable(cpu_cache_line_size == 0)) {
ml_cpu_info_t cpu_info;
ml_cpu_get_info(&cpu_info);
cpu_cache_line_size = (uint32_t)cpu_info.cache_line_size;
ASSERT((SKMEM_PAGE_SIZE % cpu_cache_line_size) == 0);
}
return cpu_cache_line_size;
}
/*
* Dispatch a function to execute in a thread call.
*/
void
skmem_dispatch(thread_call_t tcall, void (*func)(void), uint64_t delay)
{
uint64_t now = mach_absolute_time();
uint64_t ival, deadline = now;
ASSERT(tcall != NULL);
if (delay == 0) {
delay = (10 * NSEC_PER_USEC); /* "immediately", 10 usec */
}
nanoseconds_to_absolutetime(delay, &ival);
clock_deadline_for_periodic_event(ival, now, &deadline);
(void) thread_call_enter1_delayed(tcall, func, deadline);
}
static void
skmem_sys_region_init(void)
{
/*
* XXX -fbounds-safety: Previously the following error was generated:
* error: pointer 'srp.srp_name' with '__terminated_by' attribute must
* be initialized. The suggested solution is to set it to {}, until
* rdar://110645872 is resolved.
*/
struct skmem_region_params srp = {};
uint32_t msize = 0;
void *__sized_by(msize) maddr = NULL;
VERIFY(__skmem_inited);
VERIFY(sk_sys_region == NULL);
srp = *skmem_get_default(SKMEM_REGION_SYSCTLS);
ASSERT((srp.srp_cflags & (SKMEM_REGION_CR_MMAPOK |
SKMEM_REGION_CR_UREADONLY | SKMEM_REGION_CR_MONOLITHIC |
SKMEM_REGION_CR_NOMAGAZINES | SKMEM_REGION_CR_NOREDIRECT)) ==
(SKMEM_REGION_CR_MMAPOK | SKMEM_REGION_CR_UREADONLY |
SKMEM_REGION_CR_MONOLITHIC | SKMEM_REGION_CR_NOMAGAZINES |
SKMEM_REGION_CR_NOREDIRECT));
srp.srp_r_obj_cnt = 1;
srp.srp_r_obj_size = SK_SYS_OBJSIZE_DEFAULT;
skmem_region_params_config(&srp);
_CASSERT(SK_SYS_OBJSIZE_DEFAULT >= sizeof(skmem_sysctl));
sk_sys_region = skmem_region_create("global", &srp, NULL, NULL, NULL);
if (sk_sys_region == NULL) {
panic("failed to allocate global sysctls region");
/* NOTREACHED */
__builtin_unreachable();
}
sk_sys_obj = skmem_region_alloc(sk_sys_region, &maddr, NULL,
NULL, SKMEM_SLEEP, sk_sys_region->skr_c_obj_size, &msize);
sk_sys_objsize = SK_SYS_OBJSIZE_DEFAULT;
if (sk_sys_obj == NULL) {
panic("failed to allocate global sysctls object (%u bytes)",
sk_sys_objsize);
/* NOTREACHED */
__builtin_unreachable();
}
skmem_sysctl_init();
}
static void
skmem_sys_region_fini(void)
{
if (sk_sys_region != NULL) {
skmem_region_free(sk_sys_region, sk_sys_obj, NULL);
sk_sys_obj = NULL;
sk_sys_objsize = 0;
skmem_region_release(sk_sys_region);
sk_sys_region = NULL;
}
VERIFY(sk_sys_obj == NULL);
}
struct skmem_region *
skmem_get_sysctls_region(void)
{
return sk_sys_region;
}
void *__sized_by(sk_sys_objsize)
skmem_get_sysctls_obj(size_t * size)
{
if (size != NULL) {
*size = sk_sys_objsize;
}
return sk_sys_obj;
}
/* for VM stats */
extern unsigned int vm_page_free_count, vm_page_speculative_count,
vm_page_active_count, vm_page_inactive_count, vm_page_inactive_count,
vm_page_wire_count, vm_page_throttled_count, vm_lopage_free_count,
vm_page_purgeable_count, vm_page_purged_count;
#define SKMEM_WDT_DUMP_BUF_CHK() do { \
clen -= k; \
if (clen < 1) \
goto done; \
c += k; \
} while (0)
/*
* The compiler doesn't know that snprintf() supports %b format
* specifier, so use our own wrapper to vsnprintf() here instead.
*/
#define skmem_snprintf(str, size, format, ...) ({ \
_Pragma("clang diagnostic push") \
_Pragma("clang diagnostic ignored \"-Wformat-invalid-specifier\"") \
_Pragma("clang diagnostic ignored \"-Wformat-extra-args\"") \
_Pragma("clang diagnostic ignored \"-Wformat\"") \
snprintf(str, size, format, ## __VA_ARGS__) \
_Pragma("clang diagnostic pop"); \
})
__attribute__((noinline, cold, not_tail_called))
char *
skmem_dump(struct skmem_region *skr)
{
int k, clen = SKMEM_DUMP_BUF_SIZE;
struct skmem_cache *skm;
char *c;
/* allocate space for skmem_dump_buf */
if (skmem_dump_buf == NULL) {
skmem_dump_buf = (char *) kalloc_data(SKMEM_DUMP_BUF_SIZE,
(Z_ZERO | Z_WAITOK));
VERIFY(skmem_dump_buf != NULL);
} else {
bzero(skmem_dump_buf, SKMEM_DUMP_BUF_SIZE);
}
c = skmem_dump_buf;
k = skmem_snprintf(c, clen,
"Region %p\n"
" | Mode : 0x%b\n"
" | Memory : [%llu in use [%llu wired]] / [%llu total]\n"
" | Transactions : [%llu segment allocs, %llu frees]\n\n",
skr, skr->skr_mode, SKR_MODE_BITS, skr->skr_meminuse,
skr->skr_w_meminuse, skr->skr_memtotal, skr->skr_alloc,
skr->skr_free);
SKMEM_WDT_DUMP_BUF_CHK();
if (skr->skr_mode & SKR_MODE_SLAB) {
for (int i = 0; i < SKR_MAX_CACHES; i++) {
if ((skm = skr->skr_cache[i]) == NULL) {
continue;
}
k = skmem_snprintf(c, clen, "Cache %p\n"
" | Mode : 0x%b\n"
" | Memory : [%llu in use] / [%llu total]\n"
" | Transactions : [%llu alloc failures]\n"
" | [%llu slab creates, %llu destroys]\n"
" | [%llu slab allocs, %llu frees]\n\n",
skm, skm->skm_mode, SKM_MODE_BITS,
skm->skm_sl_bufinuse, skm->skm_sl_bufmax,
skm->skm_sl_alloc_fail, skm->skm_sl_create,
skm->skm_sl_destroy, skm->skm_sl_alloc,
skm->skm_sl_free);
SKMEM_WDT_DUMP_BUF_CHK();
}
}
k = skmem_snprintf(c, clen,
"VM Pages\n"
" | Free : %u [%u speculative]\n"
" | Active : %u\n"
" | Inactive : %u\n"
" | Wired : %u [%u throttled, %u lopage_free]\n"
" | Purgeable : %u [%u purged]\n",
vm_page_free_count, vm_page_speculative_count,
vm_page_active_count, vm_page_inactive_count,
vm_page_wire_count, vm_page_throttled_count, vm_lopage_free_count,
vm_page_purgeable_count, vm_page_purged_count);
SKMEM_WDT_DUMP_BUF_CHK();
done:
return skmem_dump_buf;
}
boolean_t
skmem_lowmem_check(void)
{
unsigned int plevel = kVMPressureNormal;
kern_return_t ret;
ret = mach_vm_pressure_level_monitor(false, &plevel);
if (ret == KERN_SUCCESS) {
/* kVMPressureCritical is the stage below jetsam */
if (plevel >= kVMPressureCritical) {
/*
* If we are in a low-memory situation, then we
* might want to start purging our caches.
*/
return TRUE;
}
}
return FALSE;
}