* [PATCH v7 2/6] mm: mlock: Add new mlock system call
[not found] <1439097776-27695-1-git-send-email-emunson@akamai.com>
@ 2015-08-09 5:22 ` Eric B Munson
2015-08-12 9:45 ` Michal Hocko
0 siblings, 1 reply; 2+ messages in thread
From: Eric B Munson @ 2015-08-09 5:22 UTC (permalink / raw)
To: Andrew Morton
Cc: Eric B Munson, Michal Hocko, Vlastimil Babka, Heiko Carstens,
Geert Uytterhoeven, Catalin Marinas, Stephen Rothwell,
Guenter Roeck, Andrea Arcangeli, linux-alpha, linux-kernel,
linux-arm-kernel, adi-buildroot-devel, linux-cris-kernel,
linux-ia64, linux-m68k, linux-am33-list, linux-parisc,
linuxppc-dev, linux-s390, linux-sh, sparclinux, linux-xtensa,
linux-api, linux-arch, linux-mm
With the refactored mlock code, introduce a new system call for mlock.
The new call will allow the user to specify what lock states are being
added. mlock2 is trivial at the moment, but a follow on patch will add
a new mlock state making it useful.
Signed-off-by: Eric B Munson <emunson@akamai.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: linux-alpha@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: adi-buildroot-devel@lists.sourceforge.net
Cc: linux-cris-kernel@axis.com
Cc: linux-ia64@vger.kernel.org
Cc: linux-m68k@lists.linux-m68k.org
Cc: linux-am33-list@redhat.com
Cc: linux-parisc@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-s390@vger.kernel.org
Cc: linux-sh@vger.kernel.org
Cc: sparclinux@vger.kernel.org
Cc: linux-xtensa@linux-xtensa.org
Cc: linux-api@vger.kernel.org
Cc: linux-arch@vger.kernel.org
Cc: linux-mm@kvack.org
---
arch/x86/entry/syscalls/syscall_32.tbl | 1 +
arch/x86/entry/syscalls/syscall_64.tbl | 1 +
include/linux/syscalls.h | 2 ++
include/uapi/asm-generic/unistd.h | 4 +++-
kernel/sys_ni.c | 1 +
mm/mlock.c | 8 ++++++++
6 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl
index ef8187f..8e06da6 100644
--- a/arch/x86/entry/syscalls/syscall_32.tbl
+++ b/arch/x86/entry/syscalls/syscall_32.tbl
@@ -365,3 +365,4 @@
356 i386 memfd_create sys_memfd_create
357 i386 bpf sys_bpf
358 i386 execveat sys_execveat stub32_execveat
+360 i386 mlock2 sys_mlock2
diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl
index 9ef32d5..67601e7 100644
--- a/arch/x86/entry/syscalls/syscall_64.tbl
+++ b/arch/x86/entry/syscalls/syscall_64.tbl
@@ -329,6 +329,7 @@
320 common kexec_file_load sys_kexec_file_load
321 common bpf sys_bpf
322 64 execveat stub_execveat
+324 common mlock2 sys_mlock2
#
# x32-specific system call numbers start at 512 to avoid cache impact
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index b45c45b..56a3d59 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -884,4 +884,6 @@ asmlinkage long sys_execveat(int dfd, const char __user *filename,
const char __user *const __user *argv,
const char __user *const __user *envp, int flags);
+asmlinkage long sys_mlock2(unsigned long start, size_t len, int flags);
+
#endif
diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
index e016bd9..14a6013 100644
--- a/include/uapi/asm-generic/unistd.h
+++ b/include/uapi/asm-generic/unistd.h
@@ -709,9 +709,11 @@ __SYSCALL(__NR_memfd_create, sys_memfd_create)
__SYSCALL(__NR_bpf, sys_bpf)
#define __NR_execveat 281
__SC_COMP(__NR_execveat, sys_execveat, compat_sys_execveat)
+#define __NR_mlock2 282
+__SYSCALL(__NR_mlock2, sys_mlock2)
#undef __NR_syscalls
-#define __NR_syscalls 282
+#define __NR_syscalls 283
/*
* All syscalls below here should go away really,
diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c
index 7995ef5..4818b71 100644
--- a/kernel/sys_ni.c
+++ b/kernel/sys_ni.c
@@ -193,6 +193,7 @@ cond_syscall(sys_mlock);
cond_syscall(sys_munlock);
cond_syscall(sys_mlockall);
cond_syscall(sys_munlockall);
+cond_syscall(sys_mlock2);
cond_syscall(sys_mincore);
cond_syscall(sys_madvise);
cond_syscall(sys_mremap);
diff --git a/mm/mlock.c b/mm/mlock.c
index 5692ee5..3094f27 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -643,6 +643,14 @@ SYSCALL_DEFINE2(mlock, unsigned long, start, size_t, len)
return do_mlock(start, len, VM_LOCKED);
}
+SYSCALL_DEFINE3(mlock2, unsigned long, start, size_t, len, int, flags)
+{
+ if (flags)
+ return -EINVAL;
+
+ return do_mlock(start, len, VM_LOCKED);
+}
+
SYSCALL_DEFINE2(munlock, unsigned long, start, size_t, len)
{
int ret;
--
1.9.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH v7 2/6] mm: mlock: Add new mlock system call
2015-08-09 5:22 ` [PATCH v7 2/6] mm: mlock: Add new mlock system call Eric B Munson
@ 2015-08-12 9:45 ` Michal Hocko
0 siblings, 0 replies; 2+ messages in thread
From: Michal Hocko @ 2015-08-12 9:45 UTC (permalink / raw)
To: Eric B Munson
Cc: Andrew Morton, Vlastimil Babka, Heiko Carstens,
Geert Uytterhoeven, Catalin Marinas, Stephen Rothwell,
Guenter Roeck, Andrea Arcangeli, linux-alpha, linux-kernel,
linux-arm-kernel, adi-buildroot-devel, linux-cris-kernel,
linux-ia64, linux-m68k, linux-am33-list, linux-parisc,
linuxppc-dev, linux-s390, linux-sh, sparclinux, linux-xtensa,
linux-api, linux-arch, linux-mm
On Sun 09-08-15 01:22:52, Eric B Munson wrote:
> With the refactored mlock code, introduce a new system call for mlock.
> The new call will allow the user to specify what lock states are being
> added. mlock2 is trivial at the moment, but a follow on patch will add
> a new mlock state making it useful.
Looks good to me
Acked-by: Michal Hocko <mhocko@suse.com>
> Signed-off-by: Eric B Munson <emunson@akamai.com>
> Acked-by: Vlastimil Babka <vbabka@suse.cz>
> Cc: Michal Hocko <mhocko@suse.cz>
> Cc: Vlastimil Babka <vbabka@suse.cz>
> Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
> Cc: Geert Uytterhoeven <geert@linux-m68k.org>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Stephen Rothwell <sfr@canb.auug.org.au>
> Cc: Guenter Roeck <linux@roeck-us.net>
> Cc: Andrea Arcangeli <aarcange@redhat.com>
> Cc: linux-alpha@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: adi-buildroot-devel@lists.sourceforge.net
> Cc: linux-cris-kernel@axis.com
> Cc: linux-ia64@vger.kernel.org
> Cc: linux-m68k@lists.linux-m68k.org
> Cc: linux-am33-list@redhat.com
> Cc: linux-parisc@vger.kernel.org
> Cc: linuxppc-dev@lists.ozlabs.org
> Cc: linux-s390@vger.kernel.org
> Cc: linux-sh@vger.kernel.org
> Cc: sparclinux@vger.kernel.org
> Cc: linux-xtensa@linux-xtensa.org
> Cc: linux-api@vger.kernel.org
> Cc: linux-arch@vger.kernel.org
> Cc: linux-mm@kvack.org
> ---
> arch/x86/entry/syscalls/syscall_32.tbl | 1 +
> arch/x86/entry/syscalls/syscall_64.tbl | 1 +
> include/linux/syscalls.h | 2 ++
> include/uapi/asm-generic/unistd.h | 4 +++-
> kernel/sys_ni.c | 1 +
> mm/mlock.c | 8 ++++++++
> 6 files changed, 16 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl
> index ef8187f..8e06da6 100644
> --- a/arch/x86/entry/syscalls/syscall_32.tbl
> +++ b/arch/x86/entry/syscalls/syscall_32.tbl
> @@ -365,3 +365,4 @@
> 356 i386 memfd_create sys_memfd_create
> 357 i386 bpf sys_bpf
> 358 i386 execveat sys_execveat stub32_execveat
> +360 i386 mlock2 sys_mlock2
> diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl
> index 9ef32d5..67601e7 100644
> --- a/arch/x86/entry/syscalls/syscall_64.tbl
> +++ b/arch/x86/entry/syscalls/syscall_64.tbl
> @@ -329,6 +329,7 @@
> 320 common kexec_file_load sys_kexec_file_load
> 321 common bpf sys_bpf
> 322 64 execveat stub_execveat
> +324 common mlock2 sys_mlock2
>
> #
> # x32-specific system call numbers start at 512 to avoid cache impact
> diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
> index b45c45b..56a3d59 100644
> --- a/include/linux/syscalls.h
> +++ b/include/linux/syscalls.h
> @@ -884,4 +884,6 @@ asmlinkage long sys_execveat(int dfd, const char __user *filename,
> const char __user *const __user *argv,
> const char __user *const __user *envp, int flags);
>
> +asmlinkage long sys_mlock2(unsigned long start, size_t len, int flags);
> +
> #endif
> diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
> index e016bd9..14a6013 100644
> --- a/include/uapi/asm-generic/unistd.h
> +++ b/include/uapi/asm-generic/unistd.h
> @@ -709,9 +709,11 @@ __SYSCALL(__NR_memfd_create, sys_memfd_create)
> __SYSCALL(__NR_bpf, sys_bpf)
> #define __NR_execveat 281
> __SC_COMP(__NR_execveat, sys_execveat, compat_sys_execveat)
> +#define __NR_mlock2 282
> +__SYSCALL(__NR_mlock2, sys_mlock2)
>
> #undef __NR_syscalls
> -#define __NR_syscalls 282
> +#define __NR_syscalls 283
>
> /*
> * All syscalls below here should go away really,
> diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c
> index 7995ef5..4818b71 100644
> --- a/kernel/sys_ni.c
> +++ b/kernel/sys_ni.c
> @@ -193,6 +193,7 @@ cond_syscall(sys_mlock);
> cond_syscall(sys_munlock);
> cond_syscall(sys_mlockall);
> cond_syscall(sys_munlockall);
> +cond_syscall(sys_mlock2);
> cond_syscall(sys_mincore);
> cond_syscall(sys_madvise);
> cond_syscall(sys_mremap);
> diff --git a/mm/mlock.c b/mm/mlock.c
> index 5692ee5..3094f27 100644
> --- a/mm/mlock.c
> +++ b/mm/mlock.c
> @@ -643,6 +643,14 @@ SYSCALL_DEFINE2(mlock, unsigned long, start, size_t, len)
> return do_mlock(start, len, VM_LOCKED);
> }
>
> +SYSCALL_DEFINE3(mlock2, unsigned long, start, size_t, len, int, flags)
> +{
> + if (flags)
> + return -EINVAL;
> +
> + return do_mlock(start, len, VM_LOCKED);
> +}
> +
> SYSCALL_DEFINE2(munlock, unsigned long, start, size_t, len)
> {
> int ret;
> --
> 1.9.1
--
Michal Hocko
SUSE Labs
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[not found] <1439097776-27695-1-git-send-email-emunson@akamai.com>
2015-08-09 5:22 ` [PATCH v7 2/6] mm: mlock: Add new mlock system call Eric B Munson
2015-08-12 9:45 ` Michal Hocko
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