| Message ID | 20241210024119.2488608-2-kaleshsingh@google.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | mm: Introduce arch_mmap_hint() | expand |
On Mon, Dec 9, 2024 at 6:41 PM Kalesh Singh <kaleshsingh@google.com> wrote: > > Consolidate the hint searches from both direcitons (topdown and > bottomup) into generic_mmap_hint(). > > No functional change is introduced. > > Signed-off-by: Kalesh Singh <kaleshsingh@google.com> > --- > include/linux/sched/mm.h | 4 ++++ > mm/mmap.c | 45 ++++++++++++++++++++++++---------------- > 2 files changed, 31 insertions(+), 18 deletions(-) > > diff --git a/include/linux/sched/mm.h b/include/linux/sched/mm.h > index 928a626725e6..edeec19d1708 100644 > --- a/include/linux/sched/mm.h > +++ b/include/linux/sched/mm.h > @@ -201,6 +201,10 @@ unsigned long mm_get_unmapped_area_vmflags(struct mm_struct *mm, > unsigned long flags, > vm_flags_t vm_flags); > > +unsigned long generic_mmap_hint(struct file *filp, unsigned long addr, > + unsigned long len, unsigned long pgoff, > + unsigned long flags); > + > unsigned long > generic_get_unmapped_area(struct file *filp, unsigned long addr, > unsigned long len, unsigned long pgoff, > diff --git a/mm/mmap.c b/mm/mmap.c > index df9154b15ef9..e97eb8bf4889 100644 > --- a/mm/mmap.c > +++ b/mm/mmap.c > @@ -620,6 +620,27 @@ unsigned long vm_unmapped_area(struct vm_unmapped_area_info *info) > return addr; > } > > +unsigned long generic_mmap_hint(struct file *filp, unsigned long addr, > + unsigned long len, unsigned long pgoff, > + unsigned long flags) > +{ > + struct mm_struct *mm = current->mm; > + struct vm_area_struct *vma, *prev; > + const unsigned long mmap_end = arch_get_mmap_end(addr, len, flags); > + > + if (!addr) > + return 0; > + > + addr = PAGE_ALIGN(addr); > + vma = find_vma_prev(mm, addr, &prev); > + if (mmap_end - len >= addr && addr >= mmap_min_addr && > + (!vma || addr + len <= vm_start_gap(vma)) && > + (!prev || addr >= vm_end_gap(prev))) > + return addr; > + > + return 0; > +} > + > /* Get an address range which is currently unmapped. > * For shmat() with addr=0. > * > @@ -637,7 +658,6 @@ generic_get_unmapped_area(struct file *filp, unsigned long addr, > unsigned long flags, vm_flags_t vm_flags) > { > struct mm_struct *mm = current->mm; > - struct vm_area_struct *vma, *prev; > struct vm_unmapped_area_info info = {}; > const unsigned long mmap_end = arch_get_mmap_end(addr, len, flags); > > @@ -647,14 +667,9 @@ generic_get_unmapped_area(struct file *filp, unsigned long addr, > if (flags & MAP_FIXED) > return addr; It seems you also can move the MAP_FIXED case into generic_mmap_hint(), right? > > - if (addr) { > - addr = PAGE_ALIGN(addr); > - vma = find_vma_prev(mm, addr, &prev); > - if (mmap_end - len >= addr && addr >= mmap_min_addr && > - (!vma || addr + len <= vm_start_gap(vma)) && > - (!prev || addr >= vm_end_gap(prev))) > - return addr; > - } > + addr = generic_mmap_hint(filp, addr, len, pgoff, flags); > + if (addr) > + return addr; > > info.length = len; > info.low_limit = mm->mmap_base; > @@ -685,7 +700,6 @@ generic_get_unmapped_area_topdown(struct file *filp, unsigned long addr, > unsigned long len, unsigned long pgoff, > unsigned long flags, vm_flags_t vm_flags) > { > - struct vm_area_struct *vma, *prev; > struct mm_struct *mm = current->mm; > struct vm_unmapped_area_info info = {}; > const unsigned long mmap_end = arch_get_mmap_end(addr, len, flags); > @@ -698,14 +712,9 @@ generic_get_unmapped_area_topdown(struct file *filp, unsigned long addr, > return addr; > > /* requesting a specific address */ > - if (addr) { > - addr = PAGE_ALIGN(addr); > - vma = find_vma_prev(mm, addr, &prev); > - if (mmap_end - len >= addr && addr >= mmap_min_addr && > - (!vma || addr + len <= vm_start_gap(vma)) && > - (!prev || addr >= vm_end_gap(prev))) > - return addr; > - } > + addr = generic_mmap_hint(filp, addr, len, pgoff, flags); > + if (addr) > + return addr; > > info.flags = VM_UNMAPPED_AREA_TOPDOWN; > info.length = len; > -- > 2.47.0.338.g60cca15819-goog > >
On Mon, Dec 9, 2024 at 7:27 PM Yang Shi <shy828301@gmail.com> wrote: > > On Mon, Dec 9, 2024 at 6:41 PM Kalesh Singh <kaleshsingh@google.com> wrote: > > > > Consolidate the hint searches from both direcitons (topdown and > > bottomup) into generic_mmap_hint(). > > > > No functional change is introduced. > > > > Signed-off-by: Kalesh Singh <kaleshsingh@google.com> > > --- > > include/linux/sched/mm.h | 4 ++++ > > mm/mmap.c | 45 ++++++++++++++++++++++++---------------- > > 2 files changed, 31 insertions(+), 18 deletions(-) > > > > diff --git a/include/linux/sched/mm.h b/include/linux/sched/mm.h > > index 928a626725e6..edeec19d1708 100644 > > --- a/include/linux/sched/mm.h > > +++ b/include/linux/sched/mm.h > > @@ -201,6 +201,10 @@ unsigned long mm_get_unmapped_area_vmflags(struct mm_struct *mm, > > unsigned long flags, > > vm_flags_t vm_flags); > > > > +unsigned long generic_mmap_hint(struct file *filp, unsigned long addr, > > + unsigned long len, unsigned long pgoff, > > + unsigned long flags); > > + > > unsigned long > > generic_get_unmapped_area(struct file *filp, unsigned long addr, > > unsigned long len, unsigned long pgoff, > > diff --git a/mm/mmap.c b/mm/mmap.c > > index df9154b15ef9..e97eb8bf4889 100644 > > --- a/mm/mmap.c > > +++ b/mm/mmap.c > > @@ -620,6 +620,27 @@ unsigned long vm_unmapped_area(struct vm_unmapped_area_info *info) > > return addr; > > } > > > > +unsigned long generic_mmap_hint(struct file *filp, unsigned long addr, > > + unsigned long len, unsigned long pgoff, > > + unsigned long flags) > > +{ > > + struct mm_struct *mm = current->mm; > > + struct vm_area_struct *vma, *prev; > > + const unsigned long mmap_end = arch_get_mmap_end(addr, len, flags); > > + > > + if (!addr) > > + return 0; > > + > > + addr = PAGE_ALIGN(addr); > > + vma = find_vma_prev(mm, addr, &prev); > > + if (mmap_end - len >= addr && addr >= mmap_min_addr && > > + (!vma || addr + len <= vm_start_gap(vma)) && > > + (!prev || addr >= vm_end_gap(prev))) > > + return addr; > > + > > + return 0; > > +} > > + > > /* Get an address range which is currently unmapped. > > * For shmat() with addr=0. > > * > > @@ -637,7 +658,6 @@ generic_get_unmapped_area(struct file *filp, unsigned long addr, > > unsigned long flags, vm_flags_t vm_flags) > > { > > struct mm_struct *mm = current->mm; > > - struct vm_area_struct *vma, *prev; > > struct vm_unmapped_area_info info = {}; > > const unsigned long mmap_end = arch_get_mmap_end(addr, len, flags); > > > > @@ -647,14 +667,9 @@ generic_get_unmapped_area(struct file *filp, unsigned long addr, > > if (flags & MAP_FIXED) > > return addr; > > It seems you also can move the MAP_FIXED case into generic_mmap_hint(), right? I think that could be done too. we'll need a new name :) Let me take a look at it ... -- Kalesh > > > > > - if (addr) { > > - addr = PAGE_ALIGN(addr); > > - vma = find_vma_prev(mm, addr, &prev); > > - if (mmap_end - len >= addr && addr >= mmap_min_addr && > > - (!vma || addr + len <= vm_start_gap(vma)) && > > - (!prev || addr >= vm_end_gap(prev))) > > - return addr; > > - } > > + addr = generic_mmap_hint(filp, addr, len, pgoff, flags); > > + if (addr) > > + return addr; > > > > info.length = len; > > info.low_limit = mm->mmap_base; > > @@ -685,7 +700,6 @@ generic_get_unmapped_area_topdown(struct file *filp, unsigned long addr, > > unsigned long len, unsigned long pgoff, > > unsigned long flags, vm_flags_t vm_flags) > > { > > - struct vm_area_struct *vma, *prev; > > struct mm_struct *mm = current->mm; > > struct vm_unmapped_area_info info = {}; > > const unsigned long mmap_end = arch_get_mmap_end(addr, len, flags); > > @@ -698,14 +712,9 @@ generic_get_unmapped_area_topdown(struct file *filp, unsigned long addr, > > return addr; > > > > /* requesting a specific address */ > > - if (addr) { > > - addr = PAGE_ALIGN(addr); > > - vma = find_vma_prev(mm, addr, &prev); > > - if (mmap_end - len >= addr && addr >= mmap_min_addr && > > - (!vma || addr + len <= vm_start_gap(vma)) && > > - (!prev || addr >= vm_end_gap(prev))) > > - return addr; > > - } > > + addr = generic_mmap_hint(filp, addr, len, pgoff, flags); > > + if (addr) > > + return addr; > > > > info.flags = VM_UNMAPPED_AREA_TOPDOWN; > > info.length = len; > > -- > > 2.47.0.338.g60cca15819-goog > > > >
diff --git a/include/linux/sched/mm.h b/include/linux/sched/mm.h index 928a626725e6..edeec19d1708 100644 --- a/include/linux/sched/mm.h +++ b/include/linux/sched/mm.h @@ -201,6 +201,10 @@ unsigned long mm_get_unmapped_area_vmflags(struct mm_struct *mm, unsigned long flags, vm_flags_t vm_flags); +unsigned long generic_mmap_hint(struct file *filp, unsigned long addr, + unsigned long len, unsigned long pgoff, + unsigned long flags); + unsigned long generic_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, diff --git a/mm/mmap.c b/mm/mmap.c index df9154b15ef9..e97eb8bf4889 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -620,6 +620,27 @@ unsigned long vm_unmapped_area(struct vm_unmapped_area_info *info) return addr; } +unsigned long generic_mmap_hint(struct file *filp, unsigned long addr, + unsigned long len, unsigned long pgoff, + unsigned long flags) +{ + struct mm_struct *mm = current->mm; + struct vm_area_struct *vma, *prev; + const unsigned long mmap_end = arch_get_mmap_end(addr, len, flags); + + if (!addr) + return 0; + + addr = PAGE_ALIGN(addr); + vma = find_vma_prev(mm, addr, &prev); + if (mmap_end - len >= addr && addr >= mmap_min_addr && + (!vma || addr + len <= vm_start_gap(vma)) && + (!prev || addr >= vm_end_gap(prev))) + return addr; + + return 0; +} + /* Get an address range which is currently unmapped. * For shmat() with addr=0. * @@ -637,7 +658,6 @@ generic_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long flags, vm_flags_t vm_flags) { struct mm_struct *mm = current->mm; - struct vm_area_struct *vma, *prev; struct vm_unmapped_area_info info = {}; const unsigned long mmap_end = arch_get_mmap_end(addr, len, flags); @@ -647,14 +667,9 @@ generic_get_unmapped_area(struct file *filp, unsigned long addr, if (flags & MAP_FIXED) return addr; - if (addr) { - addr = PAGE_ALIGN(addr); - vma = find_vma_prev(mm, addr, &prev); - if (mmap_end - len >= addr && addr >= mmap_min_addr && - (!vma || addr + len <= vm_start_gap(vma)) && - (!prev || addr >= vm_end_gap(prev))) - return addr; - } + addr = generic_mmap_hint(filp, addr, len, pgoff, flags); + if (addr) + return addr; info.length = len; info.low_limit = mm->mmap_base; @@ -685,7 +700,6 @@ generic_get_unmapped_area_topdown(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags, vm_flags_t vm_flags) { - struct vm_area_struct *vma, *prev; struct mm_struct *mm = current->mm; struct vm_unmapped_area_info info = {}; const unsigned long mmap_end = arch_get_mmap_end(addr, len, flags); @@ -698,14 +712,9 @@ generic_get_unmapped_area_topdown(struct file *filp, unsigned long addr, return addr; /* requesting a specific address */ - if (addr) { - addr = PAGE_ALIGN(addr); - vma = find_vma_prev(mm, addr, &prev); - if (mmap_end - len >= addr && addr >= mmap_min_addr && - (!vma || addr + len <= vm_start_gap(vma)) && - (!prev || addr >= vm_end_gap(prev))) - return addr; - } + addr = generic_mmap_hint(filp, addr, len, pgoff, flags); + if (addr) + return addr; info.flags = VM_UNMAPPED_AREA_TOPDOWN; info.length = len;
Consolidate the hint searches from both direcitons (topdown and bottomup) into generic_mmap_hint(). No functional change is introduced. Signed-off-by: Kalesh Singh <kaleshsingh@google.com> --- include/linux/sched/mm.h | 4 ++++ mm/mmap.c | 45 ++++++++++++++++++++++++---------------- 2 files changed, 31 insertions(+), 18 deletions(-)