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authorFabio M. De Francesco <fmdefrancesco@gmail.com>2022-10-13 18:17:00 +0200
committerRichard Weinberger <richard@nod.at>2023-02-01 22:11:26 +0100
commite0820368d0101452a9a35c903a549b7f32a6edff (patch)
treef073c557145d54ca69fa376aeacd8a9468418257
parent28b2bb06a381816c2c111afba4984f8ea2c17e0f (diff)
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hostfs: Replace kmap() with kmap_local_page()
The use of kmap() is being deprecated in favor of kmap_local_page(). There are two main problems with kmap(): (1) It comes with an overhead as the mapping space is restricted and protected by a global lock for synchronization and (2) it also requires global TLB invalidation when the kmap’s pool wraps and it might block when the mapping space is fully utilized until a slot becomes available. With kmap_local_page() the mappings are per thread, CPU local, can take page faults, and can be called from any context (including interrupts). It is faster than kmap() in kernels with HIGHMEM enabled. Furthermore, the tasks can be preempted and, when they are scheduled to run again, the kernel virtual addresses are restored and still valid. Therefore, replace kmap() with kmap_local_page() in hostfs_kern.c, it being the only file with kmap() call sites currently left in fs/hostfs. Cc: "Venkataramanan, Anirudh" <anirudh.venkataramanan@intel.com> Suggested-by: Ira Weiny <ira.weiny@intel.com> Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com> Signed-off-by: Richard Weinberger <richard@nod.at>
-rw-r--r--fs/hostfs/hostfs_kern.c15
1 files changed, 8 insertions, 7 deletions
diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
index 277468783fee..609f69224643 100644
--- a/fs/hostfs/hostfs_kern.c
+++ b/fs/hostfs/hostfs_kern.c
@@ -412,7 +412,7 @@ static int hostfs_writepage(struct page *page, struct writeback_control *wbc)
if (page->index >= end_index)
count = inode->i_size & (PAGE_SIZE-1);
- buffer = kmap(page);
+ buffer = kmap_local_page(page);
err = write_file(HOSTFS_I(inode)->fd, &base, buffer, count);
if (err != count) {
@@ -428,9 +428,9 @@ static int hostfs_writepage(struct page *page, struct writeback_control *wbc)
err = 0;
out:
- kunmap(page);
-
+ kunmap_local(buffer);
unlock_page(page);
+
return err;
}
@@ -441,7 +441,7 @@ static int hostfs_read_folio(struct file *file, struct folio *folio)
loff_t start = page_offset(page);
int bytes_read, ret = 0;
- buffer = kmap(page);
+ buffer = kmap_local_page(page);
bytes_read = read_file(FILE_HOSTFS_I(file)->fd, &start, buffer,
PAGE_SIZE);
if (bytes_read < 0) {
@@ -458,8 +458,9 @@ static int hostfs_read_folio(struct file *file, struct folio *folio)
out:
flush_dcache_page(page);
- kunmap(page);
+ kunmap_local(buffer);
unlock_page(page);
+
return ret;
}
@@ -484,9 +485,9 @@ static int hostfs_write_end(struct file *file, struct address_space *mapping,
unsigned from = pos & (PAGE_SIZE - 1);
int err;
- buffer = kmap(page);
+ buffer = kmap_local_page(page);
err = write_file(FILE_HOSTFS_I(file)->fd, &pos, buffer + from, copied);
- kunmap(page);
+ kunmap_local(buffer);
if (!PageUptodate(page) && err == PAGE_SIZE)
SetPageUptodate(page);