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Message-ID: <20150812094558.GD14940@dhcp22.suse.cz>
Date: Wed, 12 Aug 2015 11:45:58 +0200
From: Michal Hocko <mhocko@...nel.org>
To: Eric B Munson <emunson@...mai.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Vlastimil Babka <vbabka@...e.cz>,
Heiko Carstens <heiko.carstens@...ibm.com>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
Catalin Marinas <catalin.marinas@....com>,
Stephen Rothwell <sfr@...b.auug.org.au>,
Guenter Roeck <linux@...ck-us.net>,
Andrea Arcangeli <aarcange@...hat.com>,
linux-alpha@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
adi-buildroot-devel@...ts.sourceforge.net,
linux-cris-kernel@...s.com, linux-ia64@...r.kernel.org,
linux-m68k@...ts.linux-m68k.org, linux-am33-list@...hat.com,
linux-parisc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
sparclinux@...r.kernel.org, linux-xtensa@...ux-xtensa.org,
linux-api@...r.kernel.org, linux-arch@...r.kernel.org,
linux-mm@...ck.org
Subject: Re: [PATCH v7 2/6] mm: mlock: Add new mlock system call
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@...e.com>
> Signed-off-by: Eric B Munson <emunson@...mai.com>
> Acked-by: Vlastimil Babka <vbabka@...e.cz>
> Cc: Michal Hocko <mhocko@...e.cz>
> Cc: Vlastimil Babka <vbabka@...e.cz>
> Cc: Heiko Carstens <heiko.carstens@...ibm.com>
> Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Stephen Rothwell <sfr@...b.auug.org.au>
> Cc: Guenter Roeck <linux@...ck-us.net>
> Cc: Andrea Arcangeli <aarcange@...hat.com>
> Cc: linux-alpha@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: adi-buildroot-devel@...ts.sourceforge.net
> Cc: linux-cris-kernel@...s.com
> Cc: linux-ia64@...r.kernel.org
> Cc: linux-m68k@...ts.linux-m68k.org
> Cc: linux-am33-list@...hat.com
> Cc: linux-parisc@...r.kernel.org
> Cc: linuxppc-dev@...ts.ozlabs.org
> Cc: linux-s390@...r.kernel.org
> Cc: linux-sh@...r.kernel.org
> Cc: sparclinux@...r.kernel.org
> Cc: linux-xtensa@...ux-xtensa.org
> Cc: linux-api@...r.kernel.org
> Cc: linux-arch@...r.kernel.org
> Cc: linux-mm@...ck.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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