From: Ben Peart <peartben@gmail.com>
To: Alex Vandiver <alexmv@dropbox.com>, git@vger.kernel.org
Cc: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Subject: Re: [PATCH v2 4/4] fsmonitor: Delay updating state until after split index is merged
Date: Thu, 26 Oct 2017 16:29:22 -0400 [thread overview]
Message-ID: <0c2c567e-e978-dc59-9bf5-a41f31405139@gmail.com> (raw)
In-Reply-To: <38fa281fb175c086a5b1f1d3747597a9924e9f46.1508981451.git.alexmv@dropbox.com>
On 10/25/2017 9:31 PM, Alex Vandiver wrote:
> If the fsmonitor extension is used in conjunction with the split index
> extension, the set of entries in the index when it is first loaded is
> only a subset of the real index. This leads to only the non-"base"
> index being marked as CE_FSMONITOR_VALID.
>
> Delay the expansion of the ewah bitmap until after tweak_split_index
> has been called to merge in the base index as well.
>
> The new fsmonitor_dirty is kept from being leaked by dint of being
> cleaned up in post_read_index_from, which is guaranteed to be called
> after do_read_index in read_index_from.
>
> Signed-off-by: Alex Vandiver <alexmv@dropbox.com>
> ---
> cache.h | 1 +
> fsmonitor.c | 39 ++++++++++++++++++++++++---------------
> 2 files changed, 25 insertions(+), 15 deletions(-)
>
> diff --git a/cache.h b/cache.h
> index 25adcf681..0a4f43ec2 100644
> --- a/cache.h
> +++ b/cache.h
> @@ -348,6 +348,7 @@ struct index_state {
> unsigned char sha1[20];
> struct untracked_cache *untracked;
> uint64_t fsmonitor_last_update;
> + struct ewah_bitmap *fsmonitor_dirty;
> };
>
> extern struct index_state the_index;
> diff --git a/fsmonitor.c b/fsmonitor.c
> index 0d26ff34f..fad9c6b13 100644
> --- a/fsmonitor.c
> +++ b/fsmonitor.c
> @@ -49,20 +49,7 @@ int read_fsmonitor_extension(struct index_state *istate, const void *data,
> ewah_free(fsmonitor_dirty);
> return error("failed to parse ewah bitmap reading fsmonitor index extension");
> }
> -
> - if (git_config_get_fsmonitor()) {
> - /* Mark all entries valid */
> - for (i = 0; i < istate->cache_nr; i++)
> - istate->cache[i]->ce_flags |= CE_FSMONITOR_VALID;
> -
> - /* Mark all previously saved entries as dirty */
> - ewah_each_bit(fsmonitor_dirty, fsmonitor_ewah_callback, istate);
> -
> - /* Now mark the untracked cache for fsmonitor usage */
> - if (istate->untracked)
> - istate->untracked->use_fsmonitor = 1;
> - }
> - ewah_free(fsmonitor_dirty);
> + istate->fsmonitor_dirty = fsmonitor_dirty;
>
> trace_printf_key(&trace_fsmonitor, "read fsmonitor extension successful");
> return 0;
> @@ -239,7 +226,29 @@ void remove_fsmonitor(struct index_state *istate)
>
> void tweak_fsmonitor(struct index_state *istate)
> {
> - switch (git_config_get_fsmonitor()) {
> + int i;
> + int fsmonitor_enabled = git_config_get_fsmonitor();
> +
The logic looks good this time. It is nice to know this will now be
optimal when split index is also turned on. Thank you.
> + if (istate->fsmonitor_dirty) {
> + if (fsmonitor_enabled) {
> + /* Mark all entries valid */
> + for (i = 0; i < istate->cache_nr; i++) {
> + istate->cache[i]->ce_flags |= CE_FSMONITOR_VALID;
> + }
> +
> + /* Mark all previously saved entries as dirty */
> + ewah_each_bit(istate->fsmonitor_dirty, fsmonitor_ewah_callback, istate);
> +
> + /* Now mark the untracked cache for fsmonitor usage */
> + if (istate->untracked)
> + istate->untracked->use_fsmonitor = 1;
> + }
> +
> + ewah_free(istate->fsmonitor_dirty);
> + istate->fsmonitor_dirty = NULL;
> + }
> +
> + switch (fsmonitor_enabled) {
> case -1: /* keep: do nothing */
> break;
> case 0: /* false */
>
next prev parent reply other threads:[~2017-10-26 20:29 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-26 1:31 [PATCH v2 0/4] fsmonitor fixes Alex Vandiver
2017-10-26 1:31 ` [PATCH v2 1/4] fsmonitor: Set the PWD to the top of the working tree Alex Vandiver
2017-10-26 1:31 ` [PATCH v2 2/4] fsmonitor: Don't bother pretty-printing JSON from watchman Alex Vandiver
2017-10-26 20:05 ` Ben Peart
2017-10-26 20:32 ` Ben Peart
2017-10-26 21:29 ` Alex Vandiver
2017-10-27 3:36 ` Ben Peart
2017-10-26 1:31 ` [PATCH v2 3/4] fsmonitor: Document GIT_TRACE_FSMONITOR Alex Vandiver
2017-10-26 1:31 ` [PATCH v2 4/4] fsmonitor: Delay updating state until after split index is merged Alex Vandiver
2017-10-26 20:29 ` Ben Peart [this message]
2017-10-26 1:33 ` [PATCH v2 1/4] fsmonitor: Set the PWD to the top of the working tree Alex Vandiver
2017-10-26 19:56 ` Ben Peart
2017-10-26 21:27 ` Alex Vandiver
2017-10-27 3:40 ` Ben Peart
2017-10-27 23:20 ` Alex Vandiver
2017-10-29 12:27 ` Johannes Schindelin
2017-10-29 12:31 ` [PATCH v2 0/4] fsmonitor fixes Johannes Schindelin
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