* + proc-faster-open-close-of-files-without-release-hook.patch added to -mm tree
@ 2018-02-16 23:07 akpm
0 siblings, 0 replies; only message in thread
From: akpm @ 2018-02-16 23:07 UTC (permalink / raw)
To: adobriyan, keescook, viro, mm-commits
The patch titled
Subject: proc: faster open/close of files without ->release hook
has been added to the -mm tree. Its filename is
proc-faster-open-close-of-files-without-release-hook.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/proc-faster-open-close-of-files-without-release-hook.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/proc-faster-open-close-of-files-without-release-hook.patch
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------------------------------------------------------
From: Alexey Dobriyan <adobriyan@gmail.com>
Subject: proc: faster open/close of files without ->release hook
The whole point of code in fs/proc/inode.c is to make sure ->release hook
is called either at close() or at rmmod time.
All if it is unnecessary if there is no ->release hook.
Save allocation+list manipulations under spinlock in that case.
Link: http://lkml.kernel.org/r/20180214063033.GA15579@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
fs/proc/inode.c | 41 +++++++++++++++++++++++------------------
1 file changed, 23 insertions(+), 18 deletions(-)
diff -puN fs/proc/inode.c~proc-faster-open-close-of-files-without-release-hook fs/proc/inode.c
--- a/fs/proc/inode.c~proc-faster-open-close-of-files-without-release-hook
+++ a/fs/proc/inode.c
@@ -342,31 +342,36 @@ static int proc_reg_open(struct inode *i
*
* Save every "struct file" with custom ->release hook.
*/
- pdeo = kmalloc(sizeof(struct pde_opener), GFP_KERNEL);
- if (!pdeo)
- return -ENOMEM;
-
- if (!use_pde(pde)) {
- kfree(pdeo);
+ if (!use_pde(pde))
return -ENOENT;
- }
- open = pde->proc_fops->open;
+
release = pde->proc_fops->release;
+ if (release) {
+ pdeo = kmalloc(sizeof(struct pde_opener), GFP_KERNEL);
+ if (!pdeo) {
+ rv = -ENOMEM;
+ goto out_unuse;
+ }
+ }
+ open = pde->proc_fops->open;
if (open)
rv = open(inode, file);
- if (rv == 0 && release) {
- /* To know what to release. */
- pdeo->file = file;
- pdeo->closing = false;
- pdeo->c = NULL;
- spin_lock(&pde->pde_unload_lock);
- list_add(&pdeo->lh, &pde->pde_openers);
- spin_unlock(&pde->pde_unload_lock);
- } else
- kfree(pdeo);
+ if (release) {
+ if (rv == 0) {
+ /* To know what to release. */
+ pdeo->file = file;
+ pdeo->closing = false;
+ pdeo->c = NULL;
+ spin_lock(&pde->pde_unload_lock);
+ list_add(&pdeo->lh, &pde->pde_openers);
+ spin_unlock(&pde->pde_unload_lock);
+ } else
+ kfree(pdeo);
+ }
+out_unuse:
unuse_pde(pde);
return rv;
}
_
Patches currently in -mm which might be from adobriyan@gmail.com are
proc-do-less-stuff-under-pde_unload_lock.patch
proc-move-proc-sysvipc-creation-to-where-it-belongs.patch
proc-faster-open-close-of-files-without-release-hook.patch
proc-randomize-struct-pde_opener.patch
proc-move-struct-pde_opener-to-kmem-cache.patch
proc-account-struct-pde_opener.patch
seq_file-delete-small-value-optimization.patch
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2018-02-16 23:07 + proc-faster-open-close-of-files-without-release-hook.patch added to -mm tree akpm
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