search for: clone_vm

Dear all, May I know whether Interpreter in llvm-2.6 can handle clone() call (with CLONE_VM flag)? Another small question is: since JIT only invokes the main() function in a program once, and does not have control to the execution while main() is running, what is the benefit of using JIT? -- Regards, Heming Cui -------------- next part -------------- An HTML attachment was scrubbed...

...current process has ->mm; if not, return 0 (effectively copying the "no mm" status into the new task_struct, is this true?). Presumably 0 return is "success", because failure returns are things like -ENOMEM. If we haven't returned, then we check if clone_flags includes CLONE_VM; if so, we set our mm = the current process' ->mm, set some elements in ->mm and ->tsk and return. If clone_flags does not include CLONE_VM, we try to set mm = dup_mm(tsk) which presumably means we are trying to duplicate the ->mm of the task being created?!? and if that fail...

...t sense to do at the same time as implementing https://trac.xapian.org/ticket/444 ). Incidentally, for the "fork() on a large process is slow" bit at the end, posix_spawn() may help assuming it's flexible enough to do what you want. The glibc implementation calls "clone(2) with CLONE_VM and CLONE_VFORK flags". Cheers, Olly

On Fri, May 5, 2023 at 6:40?AM Nicolas Dichtel <nicolas.dichtel at 6wind.com> wrote: > > Is this an intended behavior? > This breaks some of our scripts. It doesn't just break your scripts (which counts as a regression), I think it's really wrong. The worker threads should show up as threads of the thing that started them, not as processes. So they should show up in

...l/vhost_task.c index b7cbd66f889e..3700c21ea39d 100644 --- a/kernel/vhost_task.c +++ b/kernel/vhost_task.c @@ -75,7 +78,8 @@ struct vhost_task *vhost_task_create(int (*fn)(void *), void *arg, const char *name) { struct kernel_clone_args args = { - .flags = CLONE_FS | CLONE_UNTRACED | CLONE_VM, + .flags = CLONE_FS | CLONE_THREAD | CLONE_VM | + CLONE_UNTRACED, .exit_signal = 0, .fn = vhost_task_fn, .name = name,

The following patches made over Linus's tree fix the 2 bugs: 1. vhost worker task shows up as a process forked from the parent that did VHOST_SET_OWNER ioctl instead of a process under root/kthreadd. This was causing breaking scripts. 2. vhost_tasks didn't disable or add support for freeze requests. The following patches fix these issues by making the vhost_task task a thread under the

...E, NULL); > kfree(vtsk); > } > EXPORT_SYMBOL_GPL(vhost_task_stop); > @@ -75,13 +66,14 @@ struct vhost_task *vhost_task_create(int (*fn)(void *), void *arg, > const char *name) > { > struct kernel_clone_args args = { > - .flags = CLONE_FS | CLONE_UNTRACED | CLONE_VM, > + .flags = CLONE_FS | CLONE_UNTRACED | CLONE_VM | > + CLONE_THREAD | CLONE_SIGHAND, > .exit_signal = 0, > .fn = vhost_task_fn, > .name = name, > .user_worker = 1, > .no_files = 1, > - .ignore_signals = 1, > + .block_signals = 1, > }; >...

...4/vfork.S | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) diff --git a/usr/klibc/arch/ia64/vfork.S b/usr/klibc/arch/ia64/vfork.S index 7e76a714..e513188b 100644 --- a/usr/klibc/arch/ia64/vfork.S +++ b/usr/klibc/arch/ia64/vfork.S @@ -26,16 +26,12 @@ vfork: mov r15=__NR_clone mov out0=CLONE_VM|CLONE_VFORK|SIGCHLD mov out1=0 - ;; break 0x100000 // Do the syscall - ;; - addl r15=0,r1 cmp.eq p7,p6 = -1,r10 ;; - ld8 r14=[r15] +(p7) movl r14 = errno ;; (p7) st4 [r14]=r8 - ;; (p7) mov r8=-1 br.ret.sptk.many b0 .endp vfork

Hi, I have been playing at converting the index update stage of the Recoll indexer to use multiple temporary indexes and a final merge. This yields an improvement factor of almost 3 (on my quad-core CPU), for the total indexing time for "easy" files like HTML pages. This is nice (!) and I wanted to share my admiration for the "compact()" method. If someone is interested in a

...r must fire it up * through vhost_task_start(). */ -struct vhost_task *vhost_task_create(int (*fn)(void *), void *arg, +struct vhost_task *vhost_task_create(bool (*fn)(void *), void *arg, const char *name) { struct kernel_clone_args args = { - .flags = CLONE_FS | CLONE_UNTRACED | CLONE_VM, + .flags = CLONE_FS | CLONE_UNTRACED | CLONE_VM | + CLONE_THREAD | CLONE_SIGHAND, .exit_signal = 0, .fn = vhost_task_fn, .name = name, .user_worker = 1, .no_files = 1, - .ignore_signals = 1, }; struct vhost_task *vtsk; struct task_struct *tsk; -- 2.25.1

On Wed, Dec 30, 2009 at 7:53 PM, Heming Cui <heming at cs.columbia.edu> wrote: > Dear all, >      I hope you enjoy your christmas! Recently I started to play lli with > bc. I found that the lli only calls the main() function in bc file and then > does nothing before the main() function returns, which means that the > JIT::runFunction() function is involved only once with the

...at wildopensource.com> + * + */ + +/* This syscall is a special case of the clone syscall */ +#include <asm/unistd.h> +#include <asm/signal.h> +#include <klibc/archsys.h> + +/* These are redefined here because linux/sched.h isn't safe for + * inclusion in asm. + */ +#define CLONE_VM 0x00000100 /* set if VM shared between processes */ +#define CLONE_VFORK 0x00004000 /* set if parent wants the child to wake it up on exit */ + +/* pid_t vfork(void) */ +/* Implemented as clone(CLONE_VFORK | CLONE_VM | SIGCHLD, 0) */ + + .align 32 + .proc vfork + .global vfork +vfork: + alloc r2...

Hi Mike, sorry, but somehow I can't understand this patch... I'll try to read it with a fresh head on Weekend, but for example, On 06/01, Mike Christie wrote: > > static int vhost_task_fn(void *data) > { > struct vhost_task *vtsk = data; > - int ret; > + bool dead = false; > + > + for (;;) { > + bool did_work; > + > + /* mb paired w/

Dear all, I hope you enjoy your christmas! Recently I started to play lli with bc. I found that the lli only calls the main() function in bc file and then does nothing before the main() function returns, which means that the JIT::runFunction() function is involved only once with the main() function in bc file. If this was true, then lli does not have any control to the execution of program.

...e}\n"; - } 1; diff --git a/usr/klibc/arch/aarch64/vfork.S b/usr/klibc/arch/aarch64/vfork.S index 378098c..23869d3 100644 --- a/usr/klibc/arch/aarch64/vfork.S +++ b/usr/klibc/arch/aarch64/vfork.S @@ -13,10 +13,35 @@ .globl vfork .balign 8 vfork: - mov x0, #0x4111 /* CLONE_VM | CLONE_VFORK | SIGCHLD */ - mov x1, sp - cmn x0, #4095 - b.cs 1f - RET + /* Prepare for the system call */ + /* 1. Push the function pointer and argument location + on to the child process stack */ + /* 2. Gather the Flags */ + /* New sp is...

...me})\n"; + close(OUT); +} + +1; diff --git a/usr/klibc/arch/mips64/vfork.S b/usr/klibc/arch/mips64/vfork.S new file mode 100644 index 0000000..9aa955a --- /dev/null +++ b/usr/klibc/arch/mips64/vfork.S @@ -0,0 +1,15 @@ +#include <machine/asm.h> +#include <asm/unistd.h> + +#define CLONE_VM 0x00000100 +#define CLONE_VFORK 0x00004000 +#define SIGCHLD 18 + + .set noreorder + +LEAF(vfork) + li a0, CLONE_VFORK | CLONE_VM | SIGCHLD + li a1, 0 + j __syscall_common + li v0, __NR_clone + END(vfork) -- 1.8.3.4 (Apple Git-47)

...a64/vfork.S | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) diff --git a/usr/klibc/arch/ia64/vfork.S b/usr/klibc/arch/ia64/vfork.S index 7e76a71..e513188 100644 --- a/usr/klibc/arch/ia64/vfork.S +++ b/usr/klibc/arch/ia64/vfork.S @@ -26,16 +26,12 @@ vfork: mov r15=__NR_clone mov out0=CLONE_VM|CLONE_VFORK|SIGCHLD mov out1=0 - ;; break 0x100000 // Do the syscall - ;; - addl r15=0,r1 cmp.eq p7,p6 = -1,r10 ;; - ld8 r14=[r15] +(p7) movl r14 = errno ;; (p7) st4 [r14]=r8 - ;; (p7) mov r8=-1 br.ret.sptk.many b0 .endp vfork -- 1.8.5.3

...ose(OUT); +} + +1; diff --git a/usr/klibc/arch/mips/vfork.S b/usr/klibc/arch/mips/vfork.S new file mode 100644 index 0000000..f9f035b --- /dev/null +++ b/usr/klibc/arch/mips/vfork.S @@ -0,0 +1,16 @@ +#include <asm/asm.h> +#include <asm/regdef.h> +#include <asm/unistd.h> + +#define CLONE_VM 0x00000100 +#define CLONE_VFORK 0x00004000 +#define SIGCHLD 18 + + .set noreorder + +LEAF(vfork) + li a0, CLONE_VFORK | CLONE_VM | SIGCHLD + li a1, 0 + j __syscall_common + li v0, __NR_clone + END(vfork)

...= 0x80776e8 brk(0) = 0x80776e8 brk(0x8078000) = 0x8078000 mmap2(NULL, 8392704, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x4044d000 mprotect(0x4044d000, 4096, PROT_NONE) = 0 clone(child_stack=0x40c4db08, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID|CLONE_DETACHED, parent_tidptr=0x40c4dbf8, {entry_number:0, base_addr:0x40c4dbb0, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, usea...

...= -1 EBADF (Bad file descriptor) > close(-1) = -1 EBADF (Bad file descriptor) > mmap2(NULL, 8392704, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb75c4000 > mprotect(0xb75c4000, 4096, PROT_NONE) = 0 > clone(child_stack=0xb7dc44c4, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0xb7dc4bd8, {entry_number:6, base_addr:0xb7dc4b90, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}, child_tidp...