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《TQM全面质量管理》
【开课时间】2020年10月30-31深圳 10月30-31苏州 （苏州与深圳授课老师不同）
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On Mon, 2020-10-26 at 10:37 +0200, Mike Rapoport wrote:
> +++ b/arch/x86/mm/pat/set_memory.c
> @@ -2184,14 +2184,14 @@ static int __set_pages_np(struct page *page,
> int numpages)
> return __change_page_attr_set_clr(, 0);
> }
>
> -int set_direct_map_invalid_noflush(struct page *page)
>
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We actually use nrexceptional for very little these days. It's a minor
pain to keep in sync with nrpages, but the pain becomes much bigger
with the THP patches because we don't know how many indices a shadow
entry occupies. It's easier to just remove it than keep it accurate.
Also, we save 8
We no longer need to keep track of how many shadow entries are
present in a mapping. This saves a few writes to the inode and
memory barriers.
Signed-off-by: Matthew Wilcox (Oracle)
Tested-by: Vishal Verma
---
mm/filemap.c| 13 -
mm/swap_state.c | 4
mm/truncate.c | 1
We no longer track anything in nrexceptional, so remove it, saving 8
bytes per inode.
Signed-off-by: Matthew Wilcox (Oracle)
Tested-by: Vishal Verma
---
fs/inode.c | 2 +-
include/linux/fs.h | 2 --
2 files changed, 1 insertion(+), 3 deletions(-)
diff --git a/fs/inode.c b/fs/inode.c
Instead of checking the two counters (nrpages and nrexceptional), we
can just check whether i_pages is empty.
Signed-off-by: Matthew Wilcox (Oracle)
Tested-by: Vishal Verma
---
fs/block_dev.c | 2 +-
fs/dax.c| 2 +-
fs/gfs2/glock.c | 3 +--
Simplify mapping_needs_writeback() by accounting DAX entries as
pages instead of exceptional entries.
Signed-off-by: Matthew Wilcox (Oracle)
Tested-by: Vishal Verma
---
fs/dax.c | 6 +++---
mm/filemap.c | 3 ---
2 files changed, 3 insertions(+), 6 deletions(-)
diff --git a/fs/dax.c
call trace:
-> mapping_store()
-> range_parse()
..
rc = -ENXIO;
According to context, the error return value of
range_parse should be negative.
Signed-off-by: Zhang Qilong
---
drivers/dax/bus.c | 2 +-
1 file changed, 1 insertion(+),
From: Mike Rapoport
Wire up memfd_secret system call on architectures that define
ARCH_HAS_SET_DIRECT_MAP, namely arm64, risc-v and x86.
Signed-off-by: Mike Rapoport
Acked-by: Palmer Dabbelt
Acked-by: Arnd Bergmann
---
arch/arm64/include/asm/unistd.h| 2 +-
From: Mike Rapoport
Removing a PAGE_SIZE page from the direct map every time such page is
allocated for a secret memory mapping will cause severe fragmentation of
the direct map. This fragmentation can be reduced by using PMD-size pages
as a pool for small pages for secret memory mappings.
Add
From: Mike Rapoport
The test verifies that file descriptor created with memfd_secret does
not allow read/write operations, that secret memory mappings respect
RLIMIT_MEMLOCK and that remote accesses with process_vm_read() and
ptrace() to the secret memory fail.
Signed-off-by: Mike Rapoport
---
From: Mike Rapoport
It will be used by the upcoming secret memory implementation.
Signed-off-by: Mike Rapoport
---
mm/internal.h | 3 +++
mm/mmap.c | 5 ++---
2 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/mm/internal.h b/mm/internal.h
index c43ccdddb0f6..ae146a260b14
From: Mike Rapoport
Hi,
This is an implementation of "secret" mappings backed by a file descriptor.
The file descriptor backing secret memory mappings is created using a
dedicated memfd_secret system call The desired protection mode for the
memory is configured using flags parameter of the
From: Mike Rapoport
The underlying implementations of set_direct_map_invalid_noflush() and
set_direct_map_default_noflush() allow updating multiple contiguous pages
at once.
Add numpages parameter to set_direct_map_*_noflush() to expose this ability
with these APIs.
Signed-off-by: Mike
From: Mike Rapoport
Introduce "memfd_secret" system call with the ability to create memory
areas visible only in the context of the owning process and not mapped not
only to other processes but in the kernel page tables as well.
The user will create a file descriptor using the memfd_secret()
From: Mike Rapoport
The definition of PMD_PAGE_ORDER denoting the number of base pages in the
second-level leaf page is already used by DAX and maybe handy in other
cases as well.
Several architectures already have definition of PMD_ORDER as the size of
second level page table, so to avoid
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