From: Arun Prakash Jana <engineerarun@gmail.com>
Date: Mon, 18 Nov 2019 14:24:14 +0000 (+0530)
Subject: Seek advantage of kernel readahead()
X-Git-Tag: v2.8~60
X-Git-Url: http://www.git.stargrave.org/?a=commitdiff_plain;h=8705cb99a3b10dbdfd5490f04ed7c361971c26b2;p=nnn.git

Seek advantage of kernel readahead()

References:
1. http://man7.org/linux/man-pages/man2/posix_fadvise.2.html
2. https://www.oreilly.com/library/view/linux-system-programming/9781449341527/ch04.html
---

diff --git a/src/nnn.c b/src/nnn.c
index a2679947..4a7f7e36 100644
--- a/src/nnn.c
+++ b/src/nnn.c
@@ -3512,6 +3512,8 @@ static int dentfill(char *path, struct entry **dents)
 			open_max = max_openfds();
 	}
 
+	posix_fadvise(fd, 0, 0, POSIX_FADV_SEQUENTIAL);
+
 	dp = readdir(dirp);
 	if (!dp)
 		goto exit;