Two years ago Christian S.J. Peron had increased total number of SysV shm
pages on 64-bit platform, that allows to create many shm segments more than 2G
in sum. However, the patch does not allow to create a single large segment
more than 2G. The attached patches against 6.x and 7.x allow to create 2G+
segments. I know that stock 6.x will not have this feature because of
compatibility, but I send 6.x patch too because someone may want to use
2G+ shm on 6.x.
To install:
patch -d < /usr < big_sysvshmX.txt
[ rebuild kernel ]
cd /usr/src/include/
make obj
make
make install
cd /usr/src/usr.bin/ipcs/
make obj
make
make install
--
Igor Sysoev
http://sysoev.ru/en/
--- src/sys/sys/shm.h 2007-09-12 23:33:39.000000000 +0400
+++ src/sys/sys/shm.h 2007-10-15 17:42:38.000000000 +0400
@@ -77,7 +77,7 @@
struct shmid_ds {
struct ipc_perm shm_perm; /* operation permission structure */
- int shm_segsz; /* size of segment in bytes */
+ size_t shm_segsz; /* size of segment in bytes */
pid_t shm_lpid; /* process ID of last shared memory op */
pid_t shm_cpid; /* process ID of creator */
short shm_nattch; /* number of current attaches */
@@ -94,11 +94,11 @@
* might be of interest to user programs. Do we really want/need this?
*/
struct shminfo {
- int shmmax, /* max shared memory segment size (bytes) */
- shmmin, /* min shared memory segment size (bytes) */
- shmmni, /* max number of shared memory identifiers */
- shmseg, /* max shared memory segments per process */
- shmall; /* max amount of shared memory (pages) */
+ u_long shmmax; /* max shared memory segment size (bytes) */
+ u_long shmmin; /* max shared memory segment size (bytes) */
+ u_long shmmni; /* max number of shared memory identifiers */
+ u_long shmseg; /* max shared memory segments per process */
+ u_long shmall; /* max amount of shared memory (pages) */
};
/*
--- src/sys/kern/sysv_shm.c 2007-09-12 23:33:19.000000000 +0400
+++ src/sys/kern/sysv_shm.c 2007-10-15 17:16:54.000000000 +0400
@@ -181,15 +181,15 @@
static int shm_allow_removed;
SYSCTL_DECL(_kern_ipc);
-SYSCTL_INT(_kern_ipc, OID_AUTO, shmmax, CTLFLAG_RW, &shminfo.shmmax, 0,
+SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmax, CTLFLAG_RW, &shminfo.shmmax, 0,
"Maximum shared memory segment size");
-SYSCTL_INT(_kern_ipc, OID_AUTO, shmmin, CTLFLAG_RW, &shminfo.shmmin, 0,
+SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmin, CTLFLAG_RW, &shminfo.shmmin, 0,
"Minimum shared memory segment size");
-SYSCTL_INT(_kern_ipc, OID_AUTO, shmmni, CTLFLAG_RDTUN, &shminfo.shmmni, 0,
+SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmni, CTLFLAG_RDTUN, &shminfo.shmmni, 0,
"Number of shared memory identifiers");
-SYSCTL_INT(_kern_ipc, OID_AUTO, shmseg, CTLFLAG_RDTUN, &shminfo.shmseg, 0,
+SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmseg, CTLFLAG_RDTUN, &shminfo.shmseg, 0,
"Number of segments per process");
-SYSCTL_INT(_kern_ipc, OID_AUTO, shmall, CTLFLAG_RW, &shminfo.shmall, 0,
+SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmall, CTLFLAG_RW, &shminfo.shmall, 0,
"Maximum number of pages available for shared memory");
SYSCTL_INT(_kern_ipc, OID_AUTO, shm_use_phys, CTLFLAG_RW,
&shm_use_phys, 0, "Enable/Disable locking of shared memory pages in core");
@@ -754,7 +754,8 @@
struct shmget_args *uap;
int mode;
{
- int i, segnum, shmid, size;
+ int i, segnum, shmid;
+ size_t size;
struct ucred *cred = td->td_ucred;
struct shmid_kernel *shmseg;
vm_object_t shm_object;
@@ -967,15 +968,15 @@
{
int i;
- TUNABLE_INT_FETCH("kern.ipc.shmmaxpgs", &shminfo.shmall);
+ TUNABLE_ULONG_FETCH("kern.ipc.shmmaxpgs", &shminfo.shmall);
for (i = PAGE_SIZE; i > 0; i--) {
shminfo.shmmax = shminfo.shmall * i;
if (shminfo.shmmax >= shminfo.shmall)
break;
}
- TUNABLE_INT_FETCH("kern.ipc.shmmin", &shminfo.shmmin);
- TUNABLE_INT_FETCH("kern.ipc.shmmni", &shminfo.shmmni);
- TUNABLE_INT_FETCH("kern.ipc.shmseg", &shminfo.shmseg);
+ TUNABLE_ULONG_FETCH("kern.ipc.shmmin", &shminfo.shmmin);
+ TUNABLE_ULONG_FETCH("kern.ipc.shmmni", &shminfo.shmmni);
+ TUNABLE_ULONG_FETCH("kern.ipc.shmseg", &shminfo.shmseg);
TUNABLE_INT_FETCH("kern.ipc.shm_use_phys", &shm_use_phys);
shmalloced = shminfo.shmmni;
--- src/usr.bin/ipcs/ipcs.c 2007-09-12 23:32:25.000000000 +0400
+++ src/usr.bin/ipcs/ipcs.c 2007-10-15 17:29:06.000000000 +0400
@@ -93,11 +93,11 @@
};
#define SHMINFO_XVEC \
-X(shmmax, sizeof(int)) \
-X(shmmin, sizeof(int)) \
-X(shmmni, sizeof(int)) \
-X(shmseg, sizeof(int)) \
-X(shmall, sizeof(int))
+X(shmmax, sizeof(u_long)) \
+X(shmmin, sizeof(u_long)) \
+X(shmmni, sizeof(u_long)) \
+X(shmseg, sizeof(u_long)) \
+X(shmall, sizeof(u_long))
#define SEMINFO_XVEC \
X(semmap, sizeof(int)) \
@@ -376,15 +376,15 @@
if ((display & (SHMINFO | SHMTOTAL))) {
if (display & SHMTOTAL) {
printf("shminfo:\n");
- printf("\tshmmax: %12d\t(max shared memory segment
size)\n",
+ printf("\tshmmax: %12ld\t(max shared memory segment
size)\n",
shminfo.shmmax);
- printf("\tshmmin: %12d\t(min shared memory segment
size)\n",
+ printf("\tshmmin: %12ld\t(min shared memory segment
size)\n",
shminfo.shmmin);
- printf("\tshmmni: %12d\t(max number of shared memory
identifiers)\n",
+ printf("\tshmmni: %12ld\t(max number of shared memory
identifiers)\n",
shminfo.shmmni);
- printf("\tshmseg: %12d\t(max shared memory segments per
process)\n",
+ printf("\tshmseg: %12ld\t(max shared memory segments
per process)\n",
shminfo.shmseg);
- printf("\tshmall: %12d\t(max amount of shared memory in
pages)\n\n",
+ printf("\tshmall: %12ld\t(max amount of shared memory
in pages)\n\n",
shminfo.shmall);
}
if (display & SHMINFO) {
@@ -439,7 +439,7 @@
kshmptr->u.shm_nattch);
if (option & BIGGEST)
- printf(" %12d",
+ printf(" %12ld",
kshmptr->u.shm_segsz);
if (option & PID)
--- src/sys/sys/shm.h 2007-09-12 23:33:39.000000000 +0400
+++ src/sys/sys/shm.h 2007-10-15 17:42:38.000000000 +0400
@@ -77,7 +77,7 @@
struct shmid_ds {
struct ipc_perm shm_perm; /* operation permission structure */
- int shm_segsz; /* size of segment in bytes */
+ size_t shm_segsz; /* size of segment in bytes */
pid_t shm_lpid; /* process ID of last shared memory op */
pid_t shm_cpid; /* process ID of creator */
short shm_nattch; /* number of current attaches */
--- src/sys/kern/sysv_shm.c 2007-09-12 23:33:19.000000000 +0400
+++ src/sys/kern/sysv_shm.c 2007-10-15 17:16:54.000000000 +0400
@@ -717,7 +717,8 @@
struct shmget_args *uap;
int mode;
{
- int i, segnum, shmid, size;
+ int i, segnum, shmid;
+ size_t size;
struct ucred *cred = td->td_ucred;
struct shmid_kernel *shmseg;
vm_object_t shm_object;
--- src/usr.bin/ipcs/ipcs.c 2007-09-12 23:32:25.000000000 +0400
+++ src/usr.bin/ipcs/ipcs.c 2007-10-15 17:29:06.000000000 +0400
@@ -376,15 +376,15 @@
if ((display & (SHMINFO | SHMTOTAL))) {
if (display & SHMTOTAL) {
printf("shminfo:\n");
- printf("\tshmmax: %12d\t(max shared memory segment
size)\n",
+ printf("\tshmmax: %12ld\t(max shared memory segment
size)\n",
shminfo.shmmax);
- printf("\tshmmin: %12d\t(min shared memory segment
size)\n",
+ printf("\tshmmin: %12ld\t(min shared memory segment
size)\n",
shminfo.shmmin);
- printf("\tshmmni: %12d\t(max number of shared memory
identifiers)\n",
+ printf("\tshmmni: %12ld\t(max number of shared memory
identifiers)\n",
shminfo.shmmni);
- printf("\tshmseg: %12d\t(max shared memory segments per
process)\n",
+ printf("\tshmseg: %12ld\t(max shared memory segments
per process)\n",
shminfo.shmseg);
- printf("\tshmall: %12d\t(max amount of shared memory in
pages)\n\n",
+ printf("\tshmall: %12ld\t(max amount of shared memory
in pages)\n\n",
shminfo.shmall);
}
if (display & SHMINFO) {
@@ -439,7 +439,7 @@
kshmptr->u.shm_nattch);
if (option & BIGGEST)
- printf(" %12d",
+ printf(" %12ld",
kshmptr->u.shm_segsz);
if (option & PID)
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