From d9da70c7c6230b9698dc4a1dbc4d7f05794d2740 Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Wed, 3 Aug 2022 12:42:52 +0200
Subject: kernel: reuse a single allocation for all vfs_requests of a process

$ iostress 32 512 0 > /vtty # before
512 calls, 0 bytes. avg 121133
$ iostress 32 512 0 > /vtty # after
512 calls, 0 bytes. avg 103540

103540/121133 = ~85%

I think the tiny bit of added complexity is worth it here.
---
 src/kernel/vfs/request.h | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'src/kernel/vfs/request.h')

diff --git a/src/kernel/vfs/request.h b/src/kernel/vfs/request.h
index cb560c9..ee33623 100644
--- a/src/kernel/vfs/request.h
+++ b/src/kernel/vfs/request.h
@@ -51,6 +51,8 @@ struct vfs_request {
 	long offset;
 	int flags;
 
+	/* if caller != NULL, owned by it - don't free, the allocation will be reused
+	 * if caller == NULL, free on finish */
 	struct process *caller;
 	struct vfs_backend *backend;
 
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