Take the end of a file write into consideration when deciding whether
or not to use huge folios for tmpfs files when the tmpfs filesystem is
mounted with huge=within_size
This allows large writes that append to the end of a file to automatically
use large folios.
Doing 4MB squential writes without fallocate to a 16GB tmpfs file:
- 4kB pages: 1560 MB/s
- huge=within_size 4720 MB/s
- huge=always: 4720 MB/s
Signed-off-by: Rik van Riel <riel@xxxxxxxxxxx>
---
fs/xfs/scrub/xfile.c | 6 +++---
fs/xfs/xfs_buf_mem.c | 2 +-
include/linux/shmem_fs.h | 12 ++++++-----
mm/huge_memory.c | 2 +-
mm/khugepaged.c | 2 +-
mm/shmem.c | 44 +++++++++++++++++++++-------------------
mm/userfaultfd.c | 2 +-
7 files changed, 37 insertions(+), 33 deletions(-)
diff --git a/fs/xfs/scrub/xfile.c b/fs/xfs/scrub/xfile.c
index d848222f802b..e6e1c1fd23cb 100644
--- a/fs/xfs/scrub/xfile.c
+++ b/fs/xfs/scrub/xfile.c
@@ -126,7 +126,7 @@ xfile_load(
unsigned int len;
unsigned int offset;
- if (shmem_get_folio(inode, pos >> PAGE_SHIFT, &folio,
+ if (shmem_get_folio(inode, pos >> PAGE_SHIFT, 0, &folio,
SGP_READ) < 0)
break;
if (!folio) {
@@ -196,7 +196,7 @@ xfile_store(
unsigned int len;
unsigned int offset;
- if (shmem_get_folio(inode, pos >> PAGE_SHIFT, &folio,
+ if (shmem_get_folio(inode, pos >> PAGE_SHIFT, 0, &folio,
SGP_CACHE) < 0)
break;
if (filemap_check_wb_err(inode->i_mapping, 0)) {
@@ -267,7 +267,7 @@ xfile_get_folio(
i_size_write(inode, pos + len);
pflags = memalloc_nofs_save();
- error = shmem_get_folio(inode, pos >> PAGE_SHIFT, &folio,
+ error = shmem_get_folio(inode, pos >> PAGE_SHIFT, 0, &folio,
(flags & XFILE_ALLOC) ? SGP_CACHE : SGP_READ);
memalloc_nofs_restore(pflags);
if (error)
diff --git a/fs/xfs/xfs_buf_mem.c b/fs/xfs/xfs_buf_mem.c
index 9bb2d24de709..07bebbfb16ee 100644
--- a/fs/xfs/xfs_buf_mem.c
+++ b/fs/xfs/xfs_buf_mem.c
@@ -149,7 +149,7 @@ xmbuf_map_page(
return -ENOMEM;
}
- error = shmem_get_folio(inode, pos >> PAGE_SHIFT, &folio, SGP_CACHE);
+ error = shmem_get_folio(inode, pos >> PAGE_SHIFT, 0, &folio, SGP_CACHE);
if (error)
return error;
diff --git a/include/linux/shmem_fs.h b/include/linux/shmem_fs.h
index 1d06b1e5408a..846c1ea91f50 100644
--- a/include/linux/shmem_fs.h
+++ b/include/linux/shmem_fs.h
@@ -111,13 +111,15 @@ extern void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end);
int shmem_unuse(unsigned int type);
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-extern bool shmem_is_huge(struct inode *inode, pgoff_t index, bool shmem_huge_force,
- struct mm_struct *mm, unsigned long vm_flags);
+extern bool shmem_is_huge(struct inode *inode, pgoff_t index, loff_t write_end,
+ bool shmem_huge_force, struct mm_struct *mm,
+ unsigned long vm_flags);
unsigned long shmem_allowable_huge_orders(struct inode *inode,
struct vm_area_struct *vma, pgoff_t index,
bool global_huge);
#else
-static __always_inline bool shmem_is_huge(struct inode *inode, pgoff_t index, bool shmem_huge_force,
+static __always_inline bool shmem_is_huge(struct inode *inode, pgoff_t index,
+ loff_t write_end, bool shmem_huge_force,
struct mm_struct *mm, unsigned long vm_flags)
{
return false;
@@ -150,8 +152,8 @@ enum sgp_type {
SGP_FALLOC, /* like SGP_WRITE, but make existing page Uptodate */
};
-int shmem_get_folio(struct inode *inode, pgoff_t index, struct folio **foliop,
- enum sgp_type sgp);
+int shmem_get_folio(struct inode *inode, pgoff_t index, loff_t write_end,
+ struct folio **foliop, enum sgp_type sgp);
struct folio *shmem_read_folio_gfp(struct address_space *mapping,
pgoff_t index, gfp_t gfp);
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 67c86a5d64a6..8c09071e78cd 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -160,7 +160,7 @@ unsigned long __thp_vma_allowable_orders(struct vm_area_struct *vma,
* own flags.
*/
if (!in_pf && shmem_file(vma->vm_file)) {
- bool global_huge = shmem_is_huge(file_inode(vma->vm_file), vma->vm_pgoff,
+ bool global_huge = shmem_is_huge(file_inode(vma->vm_file), vma->vm_pgoff, 0,
!enforce_sysfs, vma->vm_mm, vm_flags);
if (!vma_is_anon_shmem(vma))
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index cdd1d8655a76..0ebabff10f97 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1866,7 +1866,7 @@ static int collapse_file(struct mm_struct *mm, unsigned long addr,
if (xa_is_value(folio) || !folio_test_uptodate(folio)) {
xas_unlock_irq(&xas);
/* swap in or instantiate fallocated page */
- if (shmem_get_folio(mapping->host, index,
+ if (shmem_get_folio(mapping->host, index, 0,
&folio, SGP_NOALLOC)) {
result = SCAN_FAIL;
goto xa_unlocked;
diff --git a/mm/shmem.c b/mm/shmem.c
index 5a77acf6ac6a..964c24fc480f 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -548,7 +548,7 @@ static bool shmem_confirm_swap(struct address_space *mapping,
static int shmem_huge __read_mostly = SHMEM_HUGE_NEVER;
-static bool __shmem_is_huge(struct inode *inode, pgoff_t index,
+static bool __shmem_is_huge(struct inode *inode, pgoff_t index, loff_t write_end,
bool shmem_huge_force, struct mm_struct *mm,
unsigned long vm_flags)
{
@@ -568,7 +568,8 @@ static bool __shmem_is_huge(struct inode *inode, pgoff_t index,
return true;
case SHMEM_HUGE_WITHIN_SIZE:
index = round_up(index + 1, HPAGE_PMD_NR);
- i_size = round_up(i_size_read(inode), PAGE_SIZE);
+ i_size = max(write_end, i_size_read(inode));
+ i_size = round_up(i_size, PAGE_SIZE);
if (i_size >> PAGE_SHIFT >= index)
return true;
fallthrough;
@@ -581,14 +582,14 @@ static bool __shmem_is_huge(struct inode *inode, pgoff_t index,
}
}
-bool shmem_is_huge(struct inode *inode, pgoff_t index,
+bool shmem_is_huge(struct inode *inode, pgoff_t index, loff_t write_end,
bool shmem_huge_force, struct mm_struct *mm,
unsigned long vm_flags)
{
if (HPAGE_PMD_ORDER > MAX_PAGECACHE_ORDER)
return false;
- return __shmem_is_huge(inode, index, shmem_huge_force, mm, vm_flags);
+ return __shmem_is_huge(inode, index, write_end, shmem_huge_force, mm, vm_flags);
}
#if defined(CONFIG_SYSFS)
@@ -971,7 +972,7 @@ static struct folio *shmem_get_partial_folio(struct inode *inode, pgoff_t index)
* (although in some cases this is just a waste of time).
*/
folio = NULL;
- shmem_get_folio(inode, index, &folio, SGP_READ);
+ shmem_get_folio(inode, index, 0, &folio, SGP_READ);
return folio;
}
@@ -1156,7 +1157,7 @@ static int shmem_getattr(struct mnt_idmap *idmap,
STATX_ATTR_NODUMP);
generic_fillattr(idmap, request_mask, inode, stat);
- if (shmem_is_huge(inode, 0, false, NULL, 0))
+ if (shmem_is_huge(inode, 0, 0, false, NULL, 0))
stat->blksize = HPAGE_PMD_SIZE;
if (request_mask & STATX_BTIME) {
@@ -2078,8 +2079,8 @@ static int shmem_swapin_folio(struct inode *inode, pgoff_t index,
* vmf and fault_type are only supplied by shmem_fault: otherwise they are NULL.
*/
static int shmem_get_folio_gfp(struct inode *inode, pgoff_t index,
- struct folio **foliop, enum sgp_type sgp, gfp_t gfp,
- struct vm_fault *vmf, vm_fault_t *fault_type)
+ loff_t write_end, struct folio **foliop, enum sgp_type sgp,
+ gfp_t gfp, struct vm_fault *vmf, vm_fault_t *fault_type)
{
struct vm_area_struct *vma = vmf ? vmf->vma : NULL;
struct mm_struct *fault_mm;
@@ -2158,7 +2159,7 @@ static int shmem_get_folio_gfp(struct inode *inode, pgoff_t index,
return 0;
}
- huge = shmem_is_huge(inode, index, false, fault_mm,
+ huge = shmem_is_huge(inode, index, write_end, false, fault_mm,
vma ? vma->vm_flags : 0);
/* Find hugepage orders that are allowed for anonymous shmem. */
if (vma && vma_is_anon_shmem(vma))
@@ -2268,6 +2269,7 @@ static int shmem_get_folio_gfp(struct inode *inode, pgoff_t index,
* shmem_get_folio - find, and lock a shmem folio.
* @inode: inode to search
* @index: the page index.
+ * @write_end: end of a write, could extend inode size.
* @foliop: pointer to the folio if found
* @sgp: SGP_* flags to control behavior
*
@@ -2287,10 +2289,10 @@ static int shmem_get_folio_gfp(struct inode *inode, pgoff_t index,
* Context: May sleep.
* Return: 0 if successful, else a negative error code.
*/
-int shmem_get_folio(struct inode *inode, pgoff_t index, struct folio **foliop,
- enum sgp_type sgp)
+int shmem_get_folio(struct inode *inode, pgoff_t index, loff_t write_end,
+ struct folio **foliop, enum sgp_type sgp)
{
- return shmem_get_folio_gfp(inode, index, foliop, sgp,
+ return shmem_get_folio_gfp(inode, index, write_end, foliop, sgp,
mapping_gfp_mask(inode->i_mapping), NULL, NULL);
}
EXPORT_SYMBOL_GPL(shmem_get_folio);
@@ -2385,7 +2387,7 @@ static vm_fault_t shmem_fault(struct vm_fault *vmf)
}
WARN_ON_ONCE(vmf->page != NULL);
- err = shmem_get_folio_gfp(inode, vmf->pgoff, &folio, SGP_CACHE,
+ err = shmem_get_folio_gfp(inode, vmf->pgoff, 0, &folio, SGP_CACHE,
gfp, vmf, &ret);
if (err)
return vmf_error(err);
@@ -2895,7 +2897,7 @@ shmem_write_begin(struct file *file, struct address_space *mapping,
return -EPERM;
}
- ret = shmem_get_folio(inode, index, &folio, SGP_WRITE);
+ ret = shmem_get_folio(inode, index, pos + len, &folio, SGP_WRITE);
if (ret)
return ret;
@@ -2966,7 +2968,7 @@ static ssize_t shmem_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
break;
}
- error = shmem_get_folio(inode, index, &folio, SGP_READ);
+ error = shmem_get_folio(inode, index, 0, &folio, SGP_READ);
if (error) {
if (error == -EINVAL)
error = 0;
@@ -3142,7 +3144,7 @@ static ssize_t shmem_file_splice_read(struct file *in, loff_t *ppos,
if (*ppos >= i_size_read(inode))
break;
- error = shmem_get_folio(inode, *ppos / PAGE_SIZE, &folio,
+ error = shmem_get_folio(inode, *ppos / PAGE_SIZE, 0, &folio,
SGP_READ);
if (error) {
if (error == -EINVAL)
@@ -3332,8 +3334,8 @@ static long shmem_fallocate(struct file *file, int mode, loff_t offset,
else if (shmem_falloc.nr_unswapped > shmem_falloc.nr_falloced)
error = -ENOMEM;
else
- error = shmem_get_folio(inode, index, &folio,
- SGP_FALLOC);
+ error = shmem_get_folio(inode, index, offset + len,
+ &folio, SGP_FALLOC);
if (error) {
info->fallocend = undo_fallocend;
/* Remove the !uptodate folios we added */
@@ -3684,7 +3686,7 @@ static int shmem_symlink(struct mnt_idmap *idmap, struct inode *dir,
} else {
inode_nohighmem(inode);
inode->i_mapping->a_ops = &shmem_aops;
- error = shmem_get_folio(inode, 0, &folio, SGP_WRITE);
+ error = shmem_get_folio(inode, 0, 0, &folio, SGP_WRITE);
if (error)
goto out_remove_offset;
inode->i_op = &shmem_symlink_inode_operations;
@@ -3730,7 +3732,7 @@ static const char *shmem_get_link(struct dentry *dentry, struct inode *inode,
return ERR_PTR(-ECHILD);
}
} else {
- error = shmem_get_folio(inode, 0, &folio, SGP_READ);
+ error = shmem_get_folio(inode, 0, 0, &folio, SGP_READ);
if (error)
return ERR_PTR(error);
if (!folio)
@@ -5198,7 +5200,7 @@ struct folio *shmem_read_folio_gfp(struct address_space *mapping,
struct folio *folio;
int error;
- error = shmem_get_folio_gfp(inode, index, &folio, SGP_CACHE,
+ error = shmem_get_folio_gfp(inode, index, 0, &folio, SGP_CACHE,
gfp, NULL, NULL);
if (error)
return ERR_PTR(error);
diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c
index e54e5c8907fa..cb8c76f8f118 100644
--- a/mm/userfaultfd.c
+++ b/mm/userfaultfd.c
@@ -391,7 +391,7 @@ static int mfill_atomic_pte_continue(pmd_t *dst_pmd,
struct page *page;
int ret;
- ret = shmem_get_folio(inode, pgoff, &folio, SGP_NOALLOC);
+ ret = shmem_get_folio(inode, pgoff, 0, &folio, SGP_NOALLOC);
/* Our caller expects us to return -EFAULT if we failed to find folio */
if (ret == -ENOENT)
ret = -EFAULT;
--
2.45.2
