* [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 ^ permalink raw reply [flat|nested] 2+ messages in thread
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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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