Re: [PATCH] mm: readahead: remove redundant ra_pages in file_ra_state

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hi Chen,

> But how can bdi related ra_pages reflect different files' readahead
> window? Maybe these different files are sequential read, random read
> and so on.

It's simple: sequential reads will get ra_pages readahead size while
random reads will not get readahead at all.

Talking about the below chunk, it might hurt someone that explicitly
takes advantage of the behavior, however the ra_pages*2 seems more
like a hack than general solution to me: if the user will need
POSIX_FADV_SEQUENTIAL to double the max readahead window size for
improving IO performance, then why not just increase bdi->ra_pages and
benefit all reads? One may argue that it offers some differential
behavior to specific applications, however it may also present as a
counter-optimization: if the root already tuned bdi->ra_pages to the
optimal size, the doubled readahead size will only cost more memory
and perhaps IO latency.

--- a/mm/fadvise.c
+++ b/mm/fadvise.c
@@ -87,7 +86,6 @@ SYSCALL_DEFINE(fadvise64_64)(int fd, loff_t offset, loff_t len, int advice)
                spin_unlock(&file->f_lock);
                break;
        case POSIX_FADV_SEQUENTIAL:
-               file->f_ra.ra_pages = bdi->ra_pages * 2;
                spin_lock(&file->f_lock);
                file->f_mode &= ~FMODE_RANDOM;
                spin_unlock(&file->f_lock);

Thanks,
Fengguang
--
To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[Index of Archives]     [Linux Ext4 Filesystem]     [Union Filesystem]     [Filesystem Testing]     [Ceph Users]     [Ecryptfs]     [AutoFS]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux Cachefs]     [Reiser Filesystem]     [Linux RAID]     [Samba]     [Device Mapper]     [CEPH Development]

  Powered by Linux